dialog listlengths 4 30 | title stringlengths 15 150 | category stringclasses 14 values | dialog_time stringdate 2016-01-21 01:59:30 2018-07-01 01:34:46 |
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[
{
"message": "My question is: how to make truth table for inputs on E3? There is only space for 2 bits, and E3 is written on 4 bits as I saw. Should I add more inputs for this situation or do this in different way?",
"role": "user"
},
{
"message": "Your question isn't clear but if you have 4 output ... | 4bit demultiplexer with address entries in the EXCESS-3 code | electronics | 2018-03-21T09:22:54.863 |
[
{
"message": "I want to be able to detect on my raspberry when a human contact is made with a GPIO pin (or a cable linked to a pin). I am pretty sure it's possible (for example when i see this kind of projects : <a href=\"https://www.youtube.com/watch?v=qtDZ3fYyUN0\" rel=\"nofollow noreferrer\">https://www.yout... | Detecting human body current with raspberry pi | electronics | 2018-03-21T10:16:57.580 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/EnTCl.png\" rel=\"nofollow noreferrer\">I am reasonably new to this, and I am trying to find the calculations used to choose the component values in this circuit. Concerning the Optocoupler, from what I can work out:6N139 Forward Voltage = 1.4V Supply Voltage ... | Calculating Component Values for MIDI synth | electronics | 2018-03-21T13:50:33.837 |
[
{
"message": "I got stuck in an MCQ question. Which is as following :<blockquote> Q.1) power factor of a squirrel cage induction motor is : (a) Low at heavy load only (b) Low at light and heavy loads (c) Low at light load only (d) Low at rated load only</blockquote>I am getting an answer from what ... | Effect of load on power factor in induction motor | electronics | 2018-03-21T14:12:06.857 |
[
{
"message": "I am using a flyback transformer to obtain 400 V DC from 120 V AC mains. I cannot find a transformer and switching controller available which give a higher output voltage, and do not want to deal with higher output voltages from this transformer either as it would require filter caps with larger v... | How to increase 400 V to 1600 V? Or oscillate the 400 V for a voltage multiplier? | electronics | 2018-03-22T06:06:35.833 |
[
{
"message": "Could someone please give me a rundown of how to find the currents in this problem? There are only current sources available and I am not sure how to find the branch currents.There are answers given in the textbook but no information on how to get there. <a href=\"https://i.stack.imgur.com/wnmQ0.j... | How to find currents in a mesh system with only current sources? | electronics | 2018-03-22T12:29:07.190 |
[
{
"message": "I am required to check that the software in a system correctly handles a fault condition from a high side power switch. The switch has a current sense pin which sends a voltage back to a microcontroller to let the microcontroller know all is well or not.I could destructively cut the track and sim... | Voltage fault injection possible on switch output? | electronics | 2018-03-22T14:45:47.167 |
[
{
"message": "I do understand that in a Three phase Motor, a rotating magnetic field is produced in stator and the induced magnetic field in rotor tries to aligns itself with the stator field which makes the rotor rotate.But in case of a single phase supply, there is only a pulsating stator field. So to start t... | If single phase supply can not create rotating MMF, how does Induction motor generate torque? | electronics | 2018-03-22T14:53:48.320 |
[
{
"message": "I do understand that in a Three phase Motor, a rotating magnetic field is produced in stator and the induced magnetic field in rotor tries to aligns itself with the stator field which makes the rotor rotate.But in case of a single phase supply, there is only a pulsating stator field. So to start t... | If single phase supply can not create rotating MMF, how does Induction motor generate torque? | electronics | 2018-03-22T14:53:48.320 |
[
{
"message": "Why isn't there just one pin (like in French type E)?",
"role": "user"
},
{
"message": "<a href=\"https://i.stack.imgur.com/3J0a4.jpg\" rel=\"nofollow noreferrer\">Figure 1. Schuko Type F socket. Source: <a href=\"http://www.internationalconfig.com/icc6.asp?item=70110-N\" rel=\"nofollo... | Why does schuko type F have 2 earth pins? | electronics | 2018-03-22T17:23:29.170 |
[
{
"message": "Oscilloscopes let us measure input voltage in a variety of input signal ranges (either AC/DC, +/- 500V or Gigahertz's of frequency).I am wondering: how they make it happen?Say, an oscilloscope has a microprocessor/microcontroller/ADC unit at its heart, which usually works with <code>0..5 V</code> ... | How to effectively downscale input voltage of a device? | electronics | 2018-03-23T04:08:27.653 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/s3rqb.png\" rel=\"nofollow noreferrer\">When\\$ V_{FB}>V_{REF}\\$,then the battery enter the CV mode,otherwise,battery enter CC mode,and because inherent offset voltage of the comparator, the transition from the CC stage to the CV stage may be too early or t... | Why can the offset voltage of the comparator let the transition time be longer or shorter? | electronics | 2018-03-23T14:03:14.703 |
[
{
"message": "The Amazon Echo Dot is a neat device and pretty portable, except that it doesn't have a battery and it takes a minute or so to reboot if you unplug it from one place and plug it in another. I've used a li-ion powerbank pack attached to the Dot for a year now. Very convenient to be able to carry t... | protect standby lithium ion battery from continuous charge | electronics | 2018-03-23T19:22:16.123 |
[
{
"message": "I am new in electronics and this is old subject but still. I started new Arduino project where I control 4 solenoid valves independently via Arduino 4 chanel 5 V Relay module. From the beginning I put flyback diode on each solenoid to eliminate EMF (1N4002). Everything works fine but when I speed ... | Zener diode for solenoid | electronics | 2018-03-23T19:23:58.817 |
[
{
"message": "I am trying to calculate the current required to energize and hold a 24 VAC relay coil while switching no load. I did the same for a 24 VDC relay coil using ohms law which is very simple and matched my measured current. But my calculation for the AC coil did not match my measured current value fro... | AC relay coil current calculation | electronics | 2018-03-23T19:26:00.643 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fbRj3Q.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabCould you please tell me if it is possible to drive a high-side power MOSFET <a href=\"https://w... | How to drive a high-side logic-level power MOSFET? | electronics | 2018-03-23T23:40:01.613 |
[
{
"message": "Need some feedback on techniques to make an old analog bus work with bidirectional data(half duplex is fine) at speeds upto 256kbps The cable itself is a shielded twisted pair with a nominal impedance of about 50 Ohms. It's wired to various points in large buildings in anyway the installer felt w... | Modulation ideas for old and long analog bus cabling | electronics | 2018-03-24T03:32:46.977 |
[
{
"message": "I have an ultrasonic sensor, HC SR04, connected to the atmega 8 controller along with an LED for the indication purpose. Let me discribe about my project with some anology.Say I have 20 rooms( height is 250cm )and in each room, I fixed one ultrasonic sensor module ( atmega+sensor+led ) on the roo... | Why all the other ultrasonic sensors are getting triggered when only one so actually triggered? | electronics | 2018-03-24T18:54:29.510 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/XtuLP.png\" rel=\"nofollow noreferrer\">I have a sawtooth oscillator, and I am trying to get it so that there is an average voltage of 0, so that I can later waveshape. Any idea how I can achieve this?UPDATE: I have added a filter to the output, which has given ... | How to get rid of sawtooth offset | electronics | 2018-03-24T19:35:29.793 |
[
{
"message": "I disassembled an old radio that I found in my attic and found some electronic components that I can't recognize. I think that the <a href=\"https://i.stack.imgur.com/JOUYr.jpg\" rel=\"noreferrer\">first component is an inductor. I'm pretty sure about that... But I can't understand why it's made t... | What are these electronic components from an old radio? | electronics | 2018-03-25T16:09:11.080 |
[
{
"message": "This is an old schematic, and the MPF102 JFET in the picture is confusing me.Can someone help me identify the Gate, Source, & Drain connections to this symbol, please!My guess is that the bottom right pin is gate, but it is not intuitive for me.Here is the old symbol, from the schematic:<a hre... | Schematic Symbol Help Possible Antiquated JFET Symbol Conversion | electronics | 2018-03-25T17:55:23.270 |
[
{
"message": "I'm looking for a little help designing a transistor circuit. I have a small LCD (I took from an after-market car backup cam system), and I’m trying to control its built-in menu using the buttons of an old handheld game system. The LCD has 3 buttons to navigate its menus which are on a separate PC... | Using transistors to replace push buttons | electronics | 2018-03-25T21:13:56.093 |
[
{
"message": "I'm looking for a little help designing a transistor circuit. I have a small LCD (I took from an after-market car backup cam system), and I’m trying to control its built-in menu using the buttons of an old handheld game system. The LCD has 3 buttons to navigate its menus which are on a separate PC... | Using transistors to replace push buttons | electronics | 2018-03-25T21:13:56.093 |
[
{
"message": "I'm looking for a little help designing a transistor circuit. I have a small LCD (I took from an after-market car backup cam system), and I’m trying to control its built-in menu using the buttons of an old handheld game system. The LCD has 3 buttons to navigate its menus which are on a separate PC... | Using transistors to replace push buttons | electronics | 2018-03-25T21:13:56.093 |
[
{
"message": "The circuit is an altered Joule Thief of my design that is driven by an AA or AAA battery. I’m observing the current at the battery anode with my DMM in series. (Extech EX330)<br>This circuit is extremely efficient (In relation to other Joule Thief I've build.) and does some weird stuff - like, it... | Why does DMM show AC and DC current when source is a battery? (How to calculate power in this case?) | electronics | 2018-03-26T05:09:28.963 |
[
{
"message": "I have created a circuit where I want to detect a pulse width , but unfortunately I can't get what I want. I think my circuit is totally wrong, I am looking online to find a solution, but the closest solution which I found was the Duty Cycle Adjusting Circuit for Clock Signals, which is not what I... | How to detect pulse duration with cmos circuit | electronics | 2018-03-26T13:47:10.303 |
[
{
"message": "I'm trying to build a 5V 8A buck converter and I chose the XL4016E1 IC for this operation (<a href=\"https://datasheet.lcsc.com/szlcsc/XL4016E1_C55881.pdf\" rel=\"nofollow noreferrer\">datasheet). There it says I need a 47uH 12A coil. Unfortunately i couldn't find a coild with such a high current ... | High current in Coil/Inductor | electronics | 2018-03-26T14:07:36.290 |
[
{
"message": "BackgroundGenerally components behaviour changes with respect to temperature, e.g. a resistors resistance is a function of temperature, as is the saturation current of a BJT. When putting a current through a component this can cause the temperature of the component to change.QuestionGiven that a c... | Thermal considerations for electronic measurements | electronics | 2018-03-26T15:46:17.663 |
[
{
"message": "I have this simple circuit to drive on and off a 12v rail from a microcontroller.<a href=\"https://i.stack.imgur.com/9O2S2.jpg\" rel=\"nofollow noreferrer\">R707 = 10KOhm, R708 = 10KOhm, and Q701 is a P channel mosfet (IRLML6402TRPBF)I'm driving this with a mircocontroller (3.3V). the EXT_READER_S... | MOSFET Vgs doesn't go to zero when controlling it with open drain output | electronics | 2018-03-26T16:42:33.447 |
[
{
"message": "Below is an explanation attached from my textbook: <a href=\"https://i.stack.imgur.com/B588V.png\" rel=\"nofollow noreferrer\">It explained the batteries connected in series very well as seen. Honestly, I've been researching about batteries connected in parallel on my textbook. However, I couldn't... | What does explain that the sum of voltage of the batteries connected in parallel is same? | electronics | 2018-03-26T18:50:52.577 |
[
{
"message": "After encountering a nice example from an answer of <a href=\"https://electronics.stackexchange.com/questions/13912/what-is-the-reverse-recovery-time-in-a-diode\">this question, I wanted to simulate the same circuit in LTspice to compare the reverse recovery times of two diodes 1N4148 and 1N4007 ... | Proper way to demonstrate reverse recovery time of a diode using SPICE simulation | electronics | 2018-03-26T19:52:44.993 |
[
{
"message": "Here's an odd one. I have a GFCI-protected circuit with a Uninterruptible Power Supply on it. I've found that when I test the outlets on the circuit with a GFCI outlet tester the tester does not trip the GFCI. However, when I unplug the UPS from the circuit the tester trips the GFCI as expected... | UPS causing GFCI tester not to work | electronics | 2018-03-26T22:37:31.740 |
[
{
"message": "Here's an odd one. I have a GFCI-protected circuit with a Uninterruptible Power Supply on it. I've found that when I test the outlets on the circuit with a GFCI outlet tester the tester does not trip the GFCI. However, when I unplug the UPS from the circuit the tester trips the GFCI as expected... | UPS causing GFCI tester not to work | electronics | 2018-03-26T22:37:31.740 |
[
{
"message": "This is for a part of a system that provides feedback to a <a href=\"http://cds.linear.com/docs/en/datasheet/4430fd.pdf\" rel=\"nofollow noreferrer\">voltage reference of 0.6 V. The output voltage has a range of 125 V to 500 V.Using a voltage divider, 414k and 2k will provide the 0.6 V when the ou... | How can I create a resistor (rheostat) network adjustable from 10kohm to 1Mohm? | electronics | 2018-03-27T00:46:11.613 |
[
{
"message": "I am trying to build a coil gun that will pull a magnet half through the coil, then reverse the current and repel the magnet out the rest of the way.<a href=\"https://i.stack.imgur.com/c9rMX.jpg\" rel=\"nofollow noreferrer\">I want to use 4 transistors as 2 sets of 2 to control the current. When o... | Will my coil gun circuit work? | electronics | 2018-03-27T20:29:50.317 |
[
{
"message": "I am outputting a 40kHz square wave from arduino and passing it through an RC circuit in order to get a clean 40kHz sinusoid out. However, the output wave I am getting is noisy.(see picture) Any advice on how to get rid of noise?<a href=\"https://i.stack.imgur.com/SN4As.png\" rel=\"nofollow norefe... | Getting rid of noises after RC low pass filter stage | electronics | 2018-03-27T21:58:05.163 |
[
{
"message": "The larger design is for a 170 V input, 500 V 2 mA output using a flyback converter. I will refer to the schematic on page 29 of the <a href=\"http://cds.linear.com/docs/en/datasheet/3751fd.pdf\" rel=\"nofollow noreferrer\">LT3751 switching controller, also found below.The feedback pin of the swit... | How to control switch mode power supply feedback voltage through optocoupler? | electronics | 2018-03-28T00:51:26.813 |
[
{
"message": "I use this as my headlight to my motorcycle. I know if i connect derictly to motorcyle will damage in a few days.",
"role": "user"
},
{
"message": "From the info, you have given in schematic, there is a possibility of source voltage must be higher than you have mentioned. In general, s... | 12 leds diveded by 4leds input 12 volts from motorcycle what resistor i use to it every four leds | electronics | 2018-03-28T04:59:00.933 |
[
{
"message": "I am having an issue while updating my schematic in Altium PCB. There are two errors as shown in attached image. If anyone can please elaborate on how to solve these issues, I will be highly thankful..!!<a href=\"https://i.stack.imgur.com/dED4N.jpg\" rel=\"nofollow noreferrer\">",
"role": "use... | Altium designer PCB error | electronics | 2018-03-28T08:10:38.807 |
[
{
"message": "I have an EEPROM (AT28C64B) multiplexed and connected to 3 seven segment displays, I did so using a tutorial online from ben eater <a href=\"https://www.youtube.com/watch?v=dLh1n2dErzE&t=300s\" rel=\"nofollow noreferrer\">https://www.youtube.com/watch?v=dLh1n2dErzE&t=300s<a href=\"https://... | Ghosting on 7 segment display | electronics | 2018-03-28T13:53:30.197 |
[
{
"message": "Im designing a product which needs around 5 to 7v. I need to power it from a rechargeable battery. It spends most of the day in an off state, consuming about 0mA. Sometimes is powered by the user, draws 40mA for 4 seconds and 200mA for 1 second, then it shuts down. The peculiarity of the project i... | Best battery for low power, long term application | electronics | 2018-03-28T23:11:21.673 |
[
{
"message": "I simulate a diode connected BJT circuit as follows:<a href=\"https://i.stack.imgur.com/72Golm.png\" rel=\"nofollow noreferrer\">And here are the plot for the currents through Rin I(Rin); the wire then collector-base then to base-emitter junction Ic(Q); and through the base-emitter junction Ib(Q):... | Is this circuit acting as an amplifier and how does it work? | electronics | 2018-03-29T18:03:46.417 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/UbcG1.jpg\" rel=\"nofollow noreferrer\">I am trying to Identify this SMD component, Pin 1 GND , 2-VCC, 3-? Out I can identify top letter is C , Bottom is G11, I think it might be a transistor but it odd being connected to the main power rail. Part is from bremsh... | SMD SOT89 identification | electronics | 2018-03-29T23:12:17.653 |
[
{
"message": "I opened a lithuim battery salvaged from my old laptop battery pack. I checked million times that it is 0V and it was by the time i was opening it. For some reason i would love to know, it is now MAGICALLY charged up to 3.99V and that scared me so i left it aside keeping it cool. It has no protect... | How is it possible a dead old Lithium battery becomes charged after opened? | electronics | 2018-03-29T23:12:25.800 |
[
{
"message": "I am using a STM TPDV1240RG triac to control an AC load. This triac is rated for 40A. The current in my circuit is up to 80A so I was thinking of putting 2 triacs in parallel to share the load.I am using a MOC3063 with DC pulse to turn on and off the triacs. The problem is that only one of the tri... | Trigger 2 triacs in parallel simultaneously | electronics | 2018-03-30T10:32:20.873 |
[
{
"message": "I am using an <a href=\"https://www.openhacks.com/uploadsproductos/g3mb-ssr-datasheet.pdf\" rel=\"nofollow noreferrer\">Omron G3MB-202P SSR to switch an AC outlet on and off as depicted in the below sketch.<a href=\"https://i.stack.imgur.com/37WFe.jpg\" rel=\"nofollow noreferrer\">This works fine.... | Omron G3MB-202P SSR reset loop | electronics | 2018-03-30T12:10:06.050 |
[
{
"message": "I have a question about digital circuit design. This is the situation. I have a pulse train. The length of the pulse train is not fixed. So the use of a counter is out of the question. I need to drive a signal high at the first rising edge of the pulse train and need to keep it high as long as I w... | How to latch a signal high at the first rising edge of a pulse train? | electronics | 2018-03-30T13:53:26.610 |
[
{
"message": "I am a normal mom who needs to figure out how electricity works. We all know light bulbs create heat and we need that heat to melt a very thin plastic string to move our machine along. The problem that I am having is the rules state \"No electric device may have or use an electric potential differ... | Rube Goldberg Science Project | electronics | 2018-03-30T22:09:58.443 |
[
{
"message": "I want to create an eye mask which I can apply at the Rx eye diagram up to which I can quantify the quality of my signal at the Rx. Now my question is what are the specifications to determine eye mask which is standard. I am creating SERDES channel with different channel parameters. Now at the Rx ... | Specification for Eye Mask Creation? | electronics | 2018-03-31T12:55:07.620 |
[
{
"message": "So I'm working on an Arduino project, I'm going to make a circuit board that's going to be inside my computer. The circuit needs to always have power, after a bit of googling, I found out that the standby (purple) wire seems to be perfect for what I want. I took an old computer and did this.<a hre... | How do I tap into a power supply's standby wire? | electronics | 2018-03-31T16:41:16.537 |
[
{
"message": "I just started out with Arduino, and for my first project, I need to use a photo resistor to get an accurate reading of ambient light in my room.Problem is, the photo resistor is not giving off a steady output, even in a very steady light. For example, in daylight conditions in my room, the Analog... | Photo resistor is giving off an unsteady output, how can I fix that? | electronics | 2018-03-31T22:53:57.383 |
[
{
"message": "I am using the CNY70 for a project, but i need information from the <a href=\"https://www.vishay.com/docs/83751/cny70.pdf\" rel=\"nofollow noreferrer\">datasheet. In Figure 11, which i have added below, the relative collector current, \\$I_{Crel}\\$, is shown versus the displacement, s, for six di... | Questions about CNY70 Reflective Optical Sensor datasheet | electronics | 2018-04-01T12:29:10.843 |
[
{
"message": "I wired a circuit using the NPN transistor 2N2222. <a href=\"https://i.stack.imgur.com/LWf1I.png\" rel=\"nofollow noreferrer\">An active HIGH is maintained at Arduino Pin 7 connected to the base of the transistor. The LED lights up but the brightness is considerably lower than when powered by a 9V... | How to drive a 10 Watt LED from an Arduino? | electronics | 2018-04-01T15:31:03.657 |
[
{
"message": "I am studying Transistors from the book: Arts of Electronics by Paul Horowitz and Winfield Hill (second edition). I have a few questions related to the working of a transistor, especially in the saturation region.In the rule 1, as to the working a transistor, it has been mentioned: \"The collector... | BJT Transistors | electronics | 2018-04-01T15:54:42.717 |
[
{
"message": "If the contact pad is larger than the footprint, or has a different shape but is still large enough to make full contact with the SMD, will this lead to problems during reflow soldering?I am designing a metal core PCB on which I will be mounting LM561c samsung diodes. I am striving for a high the... | Does the contact pad need to match the footprint shape of the SMD | electronics | 2018-04-01T16:35:57.363 |
[
{
"message": "I am designing a matching circuit for an EFR32BG13 SoC. The current board layout looks like this:<a href=\"https://i.stack.imgur.com/MRYs0.png\" rel=\"nofollow noreferrer\">In addition to the visible layers (top and bottom), layer 2 is a solid ground plane and layer 3 is a solid VCC plane.As a bit... | Qucs model for 2.4 GHz matching circuit | electronics | 2018-04-01T17:46:57.003 |
[
{
"message": "I am trying to detect sudden power loss in my micro controller to save its state before the MCU dies. I have been thinking to utilize one of my GPIO pin to detect the supply voltage and use a large capacitor (with a diode to stop reverse feeding into the GPIO) to get enough time to save the state.... | Detecting power loss in a microcontroller to save context | electronics | 2018-04-01T17:48:50.000 |
[
{
"message": "I'm trying to convert a beard trimmer's motor to run on LiPo battery instead of original Ni-Mh AAA size battery.It occurred to me as simple DIY project, but it turns out that's not the case.Background<br>The trimmer is a regular Philips trimmer with a simple circuit inside.There is a DC motor conn... | Beard trimmer powered by LiPo battery | electronics | 2018-04-01T17:56:59.670 |
[
{
"message": "I'm working on a thermal regulator for a greenhouse. My device will use ATtiny2313A as uC and DS18B20 as thermal sensor. I also use 1602 LCD display to monitor current temperature and set low and high limits for the heater system.I want to be able to drive heater load for about 2kW (I'm from Russi... | Thermal regulator on DS18B20 and ATtiny2313A | electronics | 2018-04-01T21:24:34.367 |
[
{
"message": "We all know that a photo diode can be used as a light detector and as a light emitter (although the way that it's built will usually make it specialized to prioritize one application over the other); an electric motor can become an electric generator and vice-versa.How does one run a resistor in ... | How do I reverse-bias a resistor? | electronics | 2018-04-02T01:53:26.247 |
[
{
"message": "I'm new to the microchip PIC world but not to electronics. I've been learning chip level PC and laptop mother board repair. I have a smart battery charger that uses a PIC12C672 that was destroyed along with a Schottky diode and a MOSFET. I want to replace the PIC12C672 and program it using a file ... | PIC12C672 Replacing Upgrading to PIC12F683 RT809F PROGRAMMER | electronics | 2018-04-02T03:18:03.670 |
[
{
"message": "There is a paper from the IEEE,title:Optimally Pre-Damped Switched-Inductor Piezoelectric Energy-Harvesting Charger,and the author show two kind of pre-damped: symmetry and asymmetry,shown as fig 1 and fig 2.<a href=\"https://i.stack.imgur.com/xqpeY.png\" rel=\"nofollow noreferrer\"><a href=\"http... | What does pre-damped mean in the pre-damped switched-inductor piezoelectric energy-harvesting charger | electronics | 2018-04-02T14:06:50.670 |
[
{
"message": "Ok guys, my question is simple, how does the pressure of an electric contact influence the resistance of the human skin?",
"role": "user"
},
{
"message": "Simple answer<blockquote> Pressure increase contact surface area and reduces micro gap of insulation.</blockquote>Salt (skin) affe... | Pressure of an electric contact and resistance | electronics | 2018-04-02T15:27:27.970 |
[
{
"message": "I got into electronics recently and I hope to make a 8 bit ripple carry adder with a decimal input and output. This input is the first schematic I designed from scratch without a tutorial to go off of and I was wondering if it would work and further, if anyone had any improvements that could be ma... | Will my decimal to binary converter work | electronics | 2018-04-02T20:42:18.007 |
[
{
"message": "3 phase AC quantities can be either represented in the Time domain or the phasor domain. It is also possible to transform 3 phase quantity to alpha-beta or d-q-0 reference frame using Clarke's transform and Parks's transform respectively. Usually, the transformation is done on AC quantities in the... | dq transformation using phasor quantities | electronics | 2018-04-02T21:53:14.723 |
[
{
"message": "I’m aware that LEDs are doped with impurities on each p-type and n-type material to increase the charge carriers of each semiconductor. My curiosity now is, how does each side continue to have extra charge carriers after a certain amount of time? In other words, I imagine each side wants to be bal... | Does an LED’s free electrons ever run out? | electronics | 2018-04-03T15:45:02.620 |
[
{
"message": "I currently have what I've gathered is a rather old custom made stepper motor driver attached to a stepper motor and am unsure how to actually operate it. I have looked around online and gathered a typical setup for driving this type of motor involves 2 H-bridges but I'm not sure how the setup I ... | Operating a stepper motor through a driver circuit | electronics | 2018-04-03T16:28:34.447 |
[
{
"message": "I want to use pins A15, B3, B4 and B5 for PWM using Timer2 and Timer3 on STM32F103C8T6. Using code based on one generated by CubeMX i've got pins A15, B3, B4 working properly, but B5 is constantly stuck on high. I tested using normal GPIO, and all four pins can change their states (so it's not iss... | STM32 HAL one of four PWM pins stays high | electronics | 2018-04-03T21:04:33.833 |
[
{
"message": "First, read <a href=\"https://electronics.stackexchange.com/questions/366289/as-i-increase-the-volume-of-this-amplifier-the-sound-gets-choppy-and-the-negativ/366292#366292\">this other question of mine. I have modified the amplifier, as suggested by τεκ to run on the full rail.This is the modified... | Loud hum and buzz... I think I know why but I don't know how to solve | electronics | 2018-04-03T23:37:21.040 |
[
{
"message": "I saw some paper,their comparison is FOM or Power Extraction Improvement(called PEI here),and they are related,PEI=FOM*100,when FOM*100,the PEI value will usually bigger than 100%,take 126% or 425% for example.I want to ask,why will most authors multiply 100 by FOM?why don't they just multiply 10?... | The relation about FOM and power extraction improvement | electronics | 2018-04-04T02:14:37.607 |
[
{
"message": "I am following this schematic: <a href=\"http://www.electronoobs.com/eng_arduino_tut13_sch2.php\" rel=\"nofollow noreferrer\">http://www.electronoobs.com/eng_arduino_tut13_sch2.phpIt uses a BD140 PNP transistor. I checked the wiring was correct. Basically, the transistor boosts the current when I ... | Why is my RGB LED strip passing current through the transistor? | electronics | 2018-04-04T06:06:15.730 |
[
{
"message": "I want to buy a survey grade single frequency L1 GPS/GLONASS/BeiDou/Galileo GNSS antenna (survey antennas have a ground plane built in). I found a <a href=\"http://www.highgain.com.cn/product/2.html\" rel=\"nofollow noreferrer\">product that specifies it is a GPS/GLONASS/BeiDou multi-frequency (L1... | Can every L1 GPS/GLONASS/BeiDou GNSS antenna receive E1 Galileo too? | electronics | 2018-04-04T11:38:39.610 |
[
{
"message": "I am programming a mbed LPC1768 for a constant current discharger. I plan to use the DAC output on the LPC1768 for setting the current in my discharge circuit. edit: The trouble i am having is related to the voltage from the DAC during start and reset. I already made and tested the discharge circu... | DAC behaviour on reset / startup LPC1768 | electronics | 2018-04-04T14:07:29.630 |
[
{
"message": "<a href=\"http://www.circuitbasics.com/design-hi-fi-audio-amplifier-lm3886/\" rel=\"nofollow noreferrer\">This link states that when determining the power needed by an amplifier, you use the following formula:<a href=\"https://i.stack.imgur.com/22CJU.png\" rel=\"nofollow noreferrer\">I understand ... | Amplifier Power Requirements | electronics | 2018-04-04T18:40:07.600 |
[
{
"message": "I've been trying to get a motor regen power dissipation circuit working that I pulled from <a href=\"https://electronics.stackexchange.com/questions/348255/dynamic-braking-mosfet-control-circuit/348268#348268\">here. The circuit works as provided but when I attempt to modify the load resistor, th... | Motor regeneration Circuit Issues | electronics | 2018-04-04T22:44:14.053 |
[
{
"message": "I have built this circuit<a href=\"https://i.stack.imgur.com/9wwEd.jpg\" rel=\"nofollow noreferrer\">to supply a few ICs. The problem is that at some point in time the load on the positive site is bigger than on the negative side. So the virtual ground moves towards the positive rail drawing curre... | Trying to build a symmetrical power supply from a VDC input without the problems of virtual ground | electronics | 2018-04-04T23:00:59.750 |
[
{
"message": "When I search for level shifting 5V pulse to 12V, I came to know about the circuit given below.<a href=\"https://i.stack.imgur.com/xFj7P.png\" rel=\"nofollow noreferrer\">It is simply based on a push-pull amplifier configuration as you all know. And what I have understood is, when the input reache... | level shifting 5V pulse to 12V pulse | electronics | 2018-04-05T04:09:30.860 |
[
{
"message": "Using an oscillator, I want to provide a square wave input to the second opamp circuit shown in the provided link(But using IC741 instead), the problem is in s domain:I get a voltage input of 1/(s^s+as+c) at non-inverting port, which is a decaying signal and I want an attenuated signal.Also, I can... | How do I compensate for Exponential decay in an op-amp circuit | electronics | 2018-04-05T14:47:14.827 |
[
{
"message": "Let's say you have a high-voltage circuit (or any voltage really) and you want to provide appropriate clearance distance for the PCB, connector pins, etc.<a href=\"https://i.stack.imgur.com/QkY8o.png\" rel=\"nofollow noreferrer\">(Above image from <a href=\"https://forum.mysensors.org/topic/4175/c... | How is clearance affected by altitude (air pressure)? | electronics | 2018-04-05T15:56:46.713 |
[
{
"message": "I'm learning about clipping circuits, and I have hit a road block with my understanding of one particular problem. The circuit in question is a serial limiter. My issue is why does the output voltage equal exactly 10V when the diode is reverse biased, that is, why doesn't the resistor affect the v... | Why does voltage stay the same regardless of resistor connect to the source | electronics | 2018-04-05T17:39:10.063 |
[
{
"message": "I have a 12V DC-powered SBC to mount inside a metal case. How important is it that I connect its ground(?) to the metal case on the interior? How is this going to protect against ESD events?From my understanding, whenever I touch the metal case, will I not be \"exchanging\" (thus equalizing) charg... | Why is it important, in terms of ESD protection, to ground a PCB to its case (if not insulative)? | electronics | 2018-04-05T19:34:42.460 |
[
{
"message": "I have built the following circuit for a reflective sensor:<br><a href=\"https://i.stack.imgur.com/DGmb0.png\" rel=\"nofollow noreferrer\">The resistor \\$R_D\\$ has been given the value 200 \\$\\Omega\\$ and the resistor \\$R_T\\$ is to be dimensioned. \\$V_{CC}\\$ is 5 V.<br>I have examined the ... | Design of output stage for CNY70 reflective sensor | electronics | 2018-04-06T11:57:11.930 |
[
{
"message": "First off I do apologize for my ignorance, I know very little on the topic so please be patient.I have one of these that are broken <a href=\"http://www.smartliving.com.au/z-wave-in-line-dimmer.html\" rel=\"nofollow noreferrer\">http://www.smartliving.com.au/z-wave-in-line-dimmer.htmlIts a Z-Wave ... | Troubleshooting Dimmer Circuit | electronics | 2018-04-06T12:53:05.410 |
[
{
"message": "I'm trying to fix a burnt blender PCB(due to short circuiting). I have tried to trace copper traces on the PCB and wondering if i Should cut off the burnt area and redesign the affected PCB or use a jumper? (Affected area has a heat sink + transistor <a href=\"https://i.stack.imgur.com/qgME8.jpg\"... | How to repair a burnt PCB? | electronics | 2018-04-06T18:01:26.710 |
[
{
"message": "I want to build an eBike for myself. I've read a lot on the subject of converting Bikes to eBikes and I think the best approach would be to build a so called friction drive, wherein a small RC BLDC motor (so called outrunner motor like <a href=\"https://www.banggood.com/270KV-Heavy-Duty-Brushless-... | Can I use this BLDC controller for RC motor for friction drive eBike? | electronics | 2018-04-06T20:03:38.183 |
[
{
"message": "Can I get a 150V DC output from the circuit below by using LM317HV-MIL? As the voltage input I will be using a 160V unregulated input voltage from a rectifier.If so, is there anything that I have to be careful such as power ratings, Vmax, Vce, etc. of the resistors, transistors, capacitors, etc.?... | Can I get a 150V DC output LM317HV-MIL | electronics | 2018-04-06T23:42:01.667 |
[
{
"message": "I'm using the LPV821 op-amp (<a href=\"http://www.ti.com/lit/ds/symlink/lpv821.pdf\" rel=\"nofollow noreferrer\">http://www.ti.com/lit/ds/symlink/lpv821.pdf) for a buffer circuit (voltage follower). Below is my circuit, where the desired output has the same voltage as the input (V2): <a href=\"htt... | Op-amp voltage buffer attentuates the input | electronics | 2018-04-07T00:26:56.043 |
[
{
"message": "Good morning everybody, I'm trying to build a 5v solar panel charger for a smartphone like the one in the picture.I would like to add also a 3.7v 3A Lipo battery with protection circuit to store energy when phone is not plugged.Do you know an easy why to make the circuit only charge usb output whe... | Solar panel + Lipo battery | electronics | 2018-04-07T07:57:02.703 |
[
{
"message": "Why can electrolytes be used as insulators? Is it because the ions are very stable atoms and will never ever gain, loss or share atoms with something else? An example is the electrolyte battery:<a href=\"https://i.stack.imgur.com/D5gdP.png\" rel=\"nofollow noreferrer\">",
"role": "user"
},
... | Why can electrolytes be used as an insulator? | electronics | 2018-04-07T09:43:36.647 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fkHIHm.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabThe circuit is simplified like above to solve the thevenin voltage.The solution says that \\$V_{... | Thevenin voltage calculation | electronics | 2018-04-07T15:02:24.073 |
[
{
"message": "I have to use level shifter circuit to interface MAX31855 with Arduino running on 5V.I found easy to build level shifter circuit at <a href=\"https://www.sparkfun.com/products/12009\" rel=\"nofollow noreferrer\">SparkFun website. It is using BSS138 (<a href=\"https://cdn.sparkfun.com/datasheets/Br... | Replace BSS138 with AO3400A in level shifter circuit | electronics | 2018-04-07T15:07:15.847 |
[
{
"message": "I was trying to figure out how much power I actually use when I am charging my phone. Here are the specifications of my charger:Input: 100/240 V, 50–60 Hz, 0.15 AOutput: 5 V, 0.7 AI've heard that in order to calculate this, you need to pay attention to the input.$$P = V\\cdot A = 240\\ \\mathrm V\... | How much power does a cell phone charger actually use? | electronics | 2018-04-07T19:59:48.107 |
[
{
"message": "I am a relatively newbie here and I am trying to build this project... so do not kick me hard and forget any stupid errors you see on the project. I appreciate any suggestions, criticism, etc., preferably with instructions on what to do. Talk to me like I am 3 years old. Show pictures... <a href=\... | Plus, Minus, Ground and the damn noise | electronics | 2018-04-07T20:25:22.213 |
[
{
"message": "I want to use the 555 time to control the timing on the power pulse of a spot-welder using a foot switch.I have seen a few 555 mono-stable circuits, but am having trouble finding the values of the resistors and capacitors in order to get times below 1 second.Also, I want to connect this circuit to... | Controlling spotwelder timer with 555 | electronics | 2018-04-08T00:51:35.903 |
[
{
"message": "I want to use the 555 time to control the timing on the power pulse of a spot-welder using a foot switch.I have seen a few 555 mono-stable circuits, but am having trouble finding the values of the resistors and capacitors in order to get times below 1 second.Also, I want to connect this circuit to... | Controlling spotwelder timer with 555 | electronics | 2018-04-08T00:51:35.903 |
[
{
"message": "<br><br>I have the following ammeter:<br><a href=\"https://www.aliexpress.com/item/Red-led-Display-Color-0-56-Digital-Ammeter-DC-0-100A-4-wires-3-digit-car/1301822575.html\" rel=\"nofollow noreferrer\">https://www.aliexpress.com/item/Red-led-Display-Color-0-56-Digital-Ammeter-DC-0-100A-4-wires-3-d... | What is the correct shunt size for the following ammeter and configuration? | electronics | 2018-04-08T04:22:39.140 |
[
{
"message": "I’m using this 3.3V LDO (<a href=\"https://www.sparkfun.com/products/526\" rel=\"nofollow noreferrer\">https://www.sparkfun.com/products/526) to power a device which normally takes 2 AAs (3V), using a 3.7V LiPo battery. The device won’t power on without the regulator (it can withstand variance in ... | LDO Voltage Regulator - What happens inside dropout range? | electronics | 2018-04-08T04:34:35.257 |
[
{
"message": "Supposing I want to measure 1-5A over a range of 1-40V on an ammeter, should I change the shunt resistor every time the voltage changes so that the voltage drop across the shunt resistor stays the same?If yes, how do ammeters on lab bench power supplies work over a wide range of voltages?",
"r... | Should a shunt in an ammeter be changed when the voltage changes? | electronics | 2018-04-08T05:14:51.237 |
[
{
"message": "I'm designing small PCB(20mm*20mm) where I'm also limited by height of whole project that can't exceed 20mm. I have to place few <a href=\"https://www.broadcom.com/products/optical-sensors/integrated-ambient-light-proximity-sensors/apds-9930\" rel=\"nofollow noreferrer\">sensors on the edge of the... | How to mount component perpendiculary to PCB | electronics | 2018-04-08T07:08:35.663 |
[
{
"message": "What really is happening inside a wire and inside battery when I connect one end of wire to the one terminal of battery but not the other (open circuit )? Questions:If I connect to the '+' terminal does any electron (even one ) get sucked inside battery terminal or not? If not why so?If now, I con... | Conductor interaction with single battery terminal | electronics | 2018-04-08T16:52:16.180 |
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