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 |
|---|---|---|---|
[
{
"message": "My board uses TTL logic, I have a motorised pot that moves too slowly at 5V. At 9V it performs well, I have little LM2577 replacement modules that output the boosted voltage well, but they consume about 30mA at idle, so I only want it on (and in turn powering the motor) when the motor is supposed ... | Using FET as SPST switch to feed H bridge with boosted voltage | electronics | 2017-09-28T15:37:22.817 |
[
{
"message": "I want to hardware-trigger a module from a separate remote data-acquisition system's analog output. The module's hardware-trigger input is optically isolated to prevent grounding problems. And the module's manual mentions the following as well:<a href=\"https://i.stack.imgur.com/eHgMr.png\" rel=\"... | Some questions about a comparator circuit used as a buffer | electronics | 2017-09-28T18:41:49.023 |
[
{
"message": "Sorry if my the answers to my question is just \"look up the specs of CMOS\", I wasn't able to find it, only data on the manufactoring process.Doing research on a project, being new, I found a <a href=\"https://forum.allaboutcircuits.com/threads/should-resistors-go-at-vcc-and-inputs-of-logic-ics-t... | Resistance on Vcc and input pins CMOS | electronics | 2017-09-28T19:44:28.590 |
[
{
"message": "I want to make the laser (Iop < 20mA and Vop < 2.5V) blink with help of MicroController.I made the following circuit and tried to test it using a 10k resistor instead of the laser in order to check the current flowing through the drain of the transistor.<a href=\"https://i.stack.imgur.com/Ll... | Microcontroller controlled pulse current source | electronics | 2017-09-28T21:19:40.273 |
[
{
"message": "The part of the schema I need to understand is this:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fRddkg.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabIt is part of the schematic of a stereo audi... | How to remove audio balance control from this schema | electronics | 2017-09-28T21:56:12.363 |
[
{
"message": "I know electronics testing with digital multimeters is easier than analog, but I'm wondering whether there is any electronic testing which can done with only \"Analog\" multimeters? For example measuring AC voltage with a square waveform: some people say it can't done with a digital multimeter bec... | When we should use only an "Analog" multimeter? | electronics | 2017-09-28T22:07:51.817 |
[
{
"message": "Any suggestion how to achieve the function in the below picture. Its a signal converter for my car ignition. The switched ground is normally used to the coil, but I wish to feed the signal to a ignition module that only takes a 3V to 1V PWM signal. <a href=\"https://i.stack.imgur.com/Reh1j.png\" r... | Signal converter | electronics | 2017-09-29T09:41:05.053 |
[
{
"message": "My question is the following:We have two 220V 20A generators connected in parallel to total power 8.8 kw 220 v 40 A load is 5.5 ohms I'm interested how each generator sees this load since every generator gives half the power. I put this question because one generator can not see this load like 5.... | load sharing in parallel generators | electronics | 2017-09-29T09:58:27.083 |
[
{
"message": "I would like to enable power to a <a href=\"https://www.digikey.com/product-detail/en/exar-corporation/SPX3819M5-L-3-3-TR/1016-1873-1-ND/3586590\" rel=\"nofollow noreferrer\">regulator from a 1Vpp guitar pickup. Threshold can be between 0.2V and 1V. And I need it to disable after about 60 seconds ... | Schmitt Trigger configuration for enabling power from guitar pickup | electronics | 2017-09-29T17:51:24.860 |
[
{
"message": "I am trying to wrap my head around wether and with which circuit it would be possible to emulate the behaviour of a digital easing function like <code>output += delta_to_target_value * easing_factor</code> as it is illustrated in a <a href=\"https://processing.org/examples/easing.html\" rel=\"nofo... | Analog Equivalent Circuit of an easing function | electronics | 2017-09-29T18:13:49.493 |
[
{
"message": "I'm looking for some help from the folks that know more about this subject than me. I'm trying to install a break beam sensor to turn on/off an electric 6 rpm motor. It powers a collator for a reloading press. I currently have the motor hooked up to a 9v power modulator. I'm not sure how to ho... | Need help with Break Beam Sensor | electronics | 2017-09-29T19:27:01.897 |
[
{
"message": "I have seen that QAM signal equation is written as sum or substraction between in-phase and quadrature component. Does it really matters if we write QAM signal equation with + or - sign? It depends whether we use $$\\cos(a+b)=\\cos a\\cos b-\\sin a\\sin b$$ or $$\\cos(a-b)=\\cos a\\cos b+\\sin a\\... | QAM signal equation | electronics | 2017-09-30T10:02:02.710 |
[
{
"message": "I designed a traffic light system using 3 bit counter where the counter acts as a timer.So I had set 3 pulses for Red,2 for yellow and 3 for green.The circuit works fine except when it transition from clock signal 4 ->5 and 6->7.PS:- I am actually a CSE grad and NOOB in electronics :-)",
"role... | Traffic light system using counter | electronics | 2017-09-30T10:34:50.340 |
[
{
"message": "I checked the wall near a plug with a Non Contact Voltage tester, and it showed electricity is present in a 3 meter diameter from the plug, on the wall. I think the wire inside has some contact with the wall. I was wondering if anybody knows for sure that if that would be the case, does it mean th... | Current drain into wall at home | electronics | 2017-09-30T13:15:21.933 |
[
{
"message": "I'm somewhere in a process of creating mini automation system for hobby use.I've already put CAT 5e cables with RJ-45 connectors in walls. They are somewhere between 5 - 30 meters long.<a href=\"https://i.imgur.com/Q4eKJq3.jpg\" rel=\"nofollow noreferrer\">On one side of the cable there is a host ... | Which RJ45 pins should I use for power supply? | electronics | 2017-09-30T13:28:58.290 |
[
{
"message": "I have here a motor with a magnetic encoder, which has 2^14 bit resolution. It is connected to an stm32f3, that I use for position control of the motor. Now, normally the P position controller uses as a second stage a PI velocity controller and as a third stage a PI current controller. I have some... | Implement a speed controller for a cascaded position controller | electronics | 2017-09-30T15:11:31.107 |
[
{
"message": "I have a sub-module in a design that has it's own regulator, i want to use its enable pin driven by an MCU output to also toggle some other IC, say 10ms after the EN has transitioned.I know i can just use two digital pins, but is there a way using an rc circuit or capacitor to do this in hardware?... | Delaying a logic level by some ms | electronics | 2017-09-30T16:42:03.947 |
[
{
"message": "I have an ESP8266 that does something, then goes to sleep.I also have an AM312 PIR sensor which wakes up the ESP when activated.The PIR generates a 2 second long pulse when activated.The ESP wakes up when RST pin goes low. I use the PIR output to drive a transistor to pull down the RST pin.This wo... | Convert 2s pulse into short pulse to wake up ESP8266 | electronics | 2017-10-01T01:23:13.327 |
[
{
"message": "I came across these two circuits, and tried them out successfully:<a href=\"http://www.reuk.co.uk/wordpress/electric-circuit/12-volt-battery-monitor-circuit-with-lm3914/\" rel=\"nofollow noreferrer\">LM3914 Battery Monitor, drives 10 LEDs in a linear relation to the input voltage.<a href=\"http://... | Q: Can I use the LM3914 voltage indicator IC as a low-voltage cutoff device? | electronics | 2017-10-02T01:59:05.120 |
[
{
"message": "I am trying to learn how to do proper DC and AC operating point biasing for a simple transistor amplifier circuitry before I attempt to debug <a href=\"https://github.com/promach/frequency_trap\" rel=\"nofollow noreferrer\">https://github.com/promach/frequency_trap. Could anyone guide me ?The outp... | Learning how to do DC and AC operating point biasing for a single transistor amplifier circuitry | electronics | 2017-10-02T12:34:20.213 |
[
{
"message": "I have this circuit from a flashlight that runs an LED with just 2xAA batteries. Initially I thought it used a boost converter or a joule thief but when I opened it up I found that it did not. It depended merely on the 3V those two Alkaline or Zinc Carbon cells output in series to light up the LED... | Joule thief point | electronics | 2017-10-02T12:56:32.007 |
[
{
"message": "If I build (a very poor) transformer (for pedagogic use) using a few windings of wire for the primary and secondary coils, and use a signal generator on the primary side, I can measure the voltage on the secondary side with an oscilloscope probe, but only if I don't ground the other side of the se... | Can't understand why oscilloscope requires incomplete circuit in order to measure voltage in secondary winding of very low inductance transformer | electronics | 2017-10-02T20:40:19.070 |
[
{
"message": "I have a <a href=\"https://download.mikroe.com/documents/add-on-boards/click/4-20ma-r/4-20ma-r-click-manual-v100.pdf\" rel=\"nofollow noreferrer\">4-20mA Receiver click module hooked up to a 5V Arduino. The goal is to have this system be able to measure 4-20mA current.I'm using a simple resistor -... | Measuring 4-20mA current using the 4 20ma R Click module | electronics | 2017-10-02T21:16:35.043 |
[
{
"message": "I am finding it very strange what is the role of <code>R1</code> in this circuit, and what would happen if I would just remove <code>R1</code> along with its connection, i.e., remove the connection inside the pink box:<a href=\"https://i.stack.imgur.com/9qER9.jpg\" rel=\"nofollow noreferrer\">Woul... | Parallel OpAmp configuration | electronics | 2017-10-02T22:33:53.923 |
[
{
"message": "I've created a circuit that uses both binary and BCD counters to convert an 8-bit binary number into three BCD numbers, which then feed into BCD to 7-segment decoder chips, and finally to common-anode displays.How it works: Upon pressing a push-button, an 8-bit binary number from a DIP switch is l... | 8-Bit Binary to BCD Decoding for Three 7-Segment Displays | electronics | 2017-10-02T22:42:23.673 |
[
{
"message": "Telephones are older than vacuum tubes and of course transistors. How was signal amplification done? I mean the technology, not the details.EDIT Some additional informations that I should have given at the beginning :The question is restricted to telephony I'm not interested in experimental eq... | Amplification before tubes and transistors were invented | electronics | 2017-10-03T05:16:26.460 |
[
{
"message": "I have a high resistance load (50k) that I need to pump ~0.2mA across. So basically, I need to put 10V across this load. It's an interesting situation because the voltage needed is quite high but the actual current is quite low. I would like to be able to charge this device with a 5V microUSB cha... | How to boost convert a LiPo battery to double or triple its voltage, while still charging at original voltage? | electronics | 2017-10-03T18:09:41.343 |
[
{
"message": "I am trying to simulate a Bubba Ocsillator on MATLAB, Simulink . The problem is that i am not able to generate the sinusoidal from the circuit. This below is my circuit : <a href=\"https://i.stack.imgur.com/VXyhc.png\" rel=\"noreferrer\">And this below is my result(Simulated for 10sec) : <a href=\... | Sine generator - Bubba Oscillator | electronics | 2017-10-03T18:55:24.303 |
[
{
"message": "I'm looking for suggestions on what type of temperature sensor to use. I need to have it attached to the heat sync of a 150V, 40A 3-phase motor controller. The motor controller is in a enclosed space and I need the monitor the heat being dissipated by the controller remotely. Whenever the moto... | Using an analog temperature sensor near 3-phase 150V , 40A Motor Controller? | electronics | 2017-10-03T18:59:59.693 |
[
{
"message": "I am trying to create an output unit for 8086 microprocessor which is connected to MP's 00ABh(10101011) address. I used 74LS373 for that. This is how I made connections:<a href=\"https://i.stack.imgur.com/NoMMV.png\" rel=\"nofollow noreferrer\">When I run the code below, LED's shows the address va... | Why does out command works wrong? (Proteus 8086) | electronics | 2017-10-03T19:55:55.327 |
[
{
"message": "I know that the erase value of NAND and NOR cells is all 1s, and the process of programming involves clearing bits. Is the program time of some x length data always the same, regardless of the number of 0s in that data? For example, does it takes less time to program 11110000 than it would take to... | On NAND or NOR flash, is program time completely independent of byte values? | electronics | 2017-10-03T23:39:50.103 |
[
{
"message": "I have a large thruster that requires 48V to operate, which I've provided through an isolated supply (Vicor DC/DC isolated converters). The thruster uses a Hall-effect sensor to adjust the speed (-5V to +5V), and hands me back an encoder output that linearly relates to the screw speed somehow (tho... | 48V coupling into digital signal | electronics | 2017-10-04T01:55:08.993 |
[
{
"message": "I am trying to simulate Bubba Oscillator using MATLAB, so far i have had success getting both sinusoidal and cosine curves from below circuit : <a href=\"https://i.stack.imgur.com/cwYZl.png\" rel=\"nofollow noreferrer\">I have used finite gain op-amp with gain = 100000; and rest of the values are ... | Bubba Oscillator - Smooth sine curve generation | electronics | 2017-10-04T06:52:29.813 |
[
{
"message": "If the client is moving relative to the base station, the Doppler shift would compress or extend the packet. If the effect is strong enough, the PN generator in the receiver will eventually get out of sync with the signal and the packet won't be received completely.What relative speed can UMTS and... | Velocity limit of UMTS and (or) CDMA2000 | electronics | 2017-10-04T20:25:13.220 |
[
{
"message": "I'm building a design involving Toshiba's TB6600 chip which has an unusal <a href=\"https://toshiba.semicon-storage.com/ap-en/design-support/package/detail.HZIP25-P-1.00F.html\" rel=\"nofollow noreferrer\">HZIP25-P-1.00F package. I've seen implementations where folks have bent the pins manually an... | Heat sinking ideas for an HZIP package | electronics | 2017-10-05T02:34:02.873 |
[
{
"message": "I would like to point out that I am not an expert (as it is perceived by the question) in the use of scr, diac, and triac and that this question is more for academic purposes than use in real life. Basically, I need to better understand how the scr is commonly used.I wish to understand how to use ... | How to use SCR to control the power of a heater | electronics | 2017-10-05T15:35:28.427 |
[
{
"message": "I would like to point out that I am not an expert (as it is perceived by the question) in the use of scr, diac, and triac and that this question is more for academic purposes than use in real life. Basically, I need to better understand how the scr is commonly used.I wish to understand how to use ... | How to use SCR to control the power of a heater | electronics | 2017-10-05T15:35:28.427 |
[
{
"message": "Problem: Powercycle microcontroller when it stops transmitting a signal (heartbeat)Question:What device can I use to detect the signal and send an output signal? I am looking for something small as this devices function is very simplistic. (another microcontroller? timer? etc...)",
"role": "us... | power cycle a micro-controller | electronics | 2017-10-05T16:49:40.237 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/cSAbB.jpg\" rel=\"nofollow noreferrer\">Apologies as I have very basic electronics background, and after searching for a whole afternoon I couldn't find out how to implement a circuitry that has this behavior as shown in the graph.If anyone can point me in a gen... | Linear behavior from 0-10V and steady at 3.3V from 10-24V | electronics | 2017-10-06T09:05:48.853 |
[
{
"message": "I'm trying to design a circuit to power 17 LEDs. The LEDs I'm using are <a href=\"http://www.mouser.com/ds/2/216/AA2810AQBS-D-13863.pdf\" rel=\"nofollow noreferrer\">AA2810AQBS/D Blue SMD LEDs with 3.3v Forward Voltage at 20mA. I would like to power this using EITHER 2xAA Alkaline batteries OR a 5... | Voltage Regulator and Resistors for LED Circuit | electronics | 2017-10-06T16:26:03.137 |
[
{
"message": "I want to utilize a USB Type-C connector to charge a single battery that powers a device. The device will only function as an upstream facing port (UFP) or sink and no data communication will need to occur using USB2.0, USB3.0/3.1, or Aux pins.What are the minimum components necessary (besides the... | USB Type-C configuration necessary for battery charging only | electronics | 2017-10-06T17:15:19.030 |
[
{
"message": "I have a group of slave clocks which receive a brief pulse once a minute from a Raspberry Pi.In case of the unlikely event of the pulse getting 'stuck' on and damaging the clocks, I mounted a Schurter 50mA slow-acting trage fuse in series with the clocks.111mA of current flows through the clocks w... | Slow-acting trage fuse unexpectedly blowing | electronics | 2017-10-07T10:46:01.880 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/8yT6L.png\" rel=\"nofollow noreferrer\">I know that using Ohm Law i can calculate the I of the 2k resistance:I = V/R <=> I= 1*10^(-3)<=> I = 1mABut i dont know what to do after , i've tried using Kirchhoff voltage law and the voltage divider formula but ... | How can i calculate Vs in this circuit knowing Vo=2? | electronics | 2017-10-07T14:30:45.640 |
[
{
"message": "I have a T1635H-T triac, that i would like to control with MOC3041. I use typical circuit from the optocoupler datasheet:<a href=\"https://i.stack.imgur.com/DfHVC.png\" rel=\"nofollow noreferrer\">The only difference is that i'm using 330Ohm resistor instead of 360Ohm. As a test load i use 40W inc... | Triac gate burns after getting current on it | electronics | 2017-10-07T21:37:27.523 |
[
{
"message": "While browsing the lab power supplies market and watching the price ranges, I've decided that I'd be better off with building my own, since I've got most of the needed parts anyways.I've searched for schematics and stumbled across the one included below. It is self-explanatory in many ways, but th... | Lab supply schematic - negative rail and darlington transistor pair | electronics | 2017-10-07T23:41:31.673 |
[
{
"message": "I am somewhat new to electronics and I've got a problem.I made a H-bridge, I'm trying to control it indirectly with my Ardunio through a PNP (BC557). The motor spins once PNP is in place however the motor keeps spinning even when I coded the digital pin (D6) to HIGH. I've tried using pull-up resis... | PNP wont turn off | electronics | 2017-10-08T07:56:17.410 |
[
{
"message": "(Apologies if this is a silly question, I don't do much electronics.)I'm converting a van into a camper. I've bought three 12V 95Ah AGM batteries (which, incidentally, will be hooked up to a solar panel) that I want to be charged by the engine when I'm driving. I'll be hooking them up in parallel,... | Does a VSR current rating affect the size of leisure batteries that it can charge? | electronics | 2017-10-08T17:38:38.260 |
[
{
"message": "I am trying to build a simple audio circuit. The goal is to store .wav files in the form of hex files in the ATMEGA328P's flash memory, and output the audio through a small speaker by using an MCP4921 DAC and an LM386N-1 Op Amp.I uploaded a portion of my EAGLE schematic. The value of AMP_FIL_R i... | Audio Noise: ATMEGA328P, MCP4921, and LM386 | electronics | 2017-10-09T00:53:50.307 |
[
{
"message": "Why all books told that Av differential of an differential input stage in power amp is very big? Ad = Rc/re, but if there are current sources in the emitter and collector circuit they will have too big impedance and division one big \"Rc\" to another big \"re\" will not give very big \"Ad\" value.... | Differential stage Av value with current sources | electronics | 2017-10-09T10:01:04.143 |
[
{
"message": "In the paper A Review of Short Pulse Generator Technology by John Mankowski (IEEE Transactions on Plasma Science, Vol. 28, No. 1, 2000, pp 102-108) I found that \"energy density of inductive storage systems is two orders of magnitude greater than that of capacitive systems\". The author first show... | Comparison of energy storage density of inductive and capacitive systems | electronics | 2017-10-09T16:32:13.533 |
[
{
"message": "I recently asked <a href=\"https://electronics.stackexchange.com/questions/332602/integrating-momentary-switch-with-a-raspberry-pi\">this question where I'm trying to wire up <a href=\"https://www.digikey.com/product-detail/en/omron-automation-and-safety/A22NZ-BNM-TWA/Z6671-ND/5603700\" rel=\"nofo... | 6VDC power sources for momentary switch | electronics | 2017-10-09T16:48:30.400 |
[
{
"message": "I have an extremely bright LED, so bright that I wouldn't want to look at it when it's at full brightness. I am dimming it with PWM (pulse-width modulation) down to 1/256 of its original brightness. At a 1/256 duty cycle, the LED appears reasonably dim. (Still quite visible, but not blindingly ... | Can bright LEDs cause eye damage even if they are dimmed with PWM? | electronics | 2017-10-10T06:09:04.697 |
[
{
"message": "This is my first layout connecting two BGAs: DDR3 SDRAM and a Zynq SoC. The design has 4 layers and I'm using Kicad. So far I've understood the following:<pre><code>1. Focus on signal groups, i.e. ADDR, CTRL, CMD and data bytes.2. Use the same layer transitions (VIAs) in each group for convenient ... | Procedure tips for connecting traces between DDR3 SDRAM and FPGA | electronics | 2017-10-10T07:49:56.530 |
[
{
"message": "I'm trying to define dimensions of the connector. And don't understand what is \"No of spaces\". What does it mean \"No of spaces\" (highlighted)?<a href=\"https://i.stack.imgur.com/moyr0.png\" rel=\"nofollow noreferrer\">",
"role": "user"
},
{
"message": "No. means the number of space... | How define dimensions of connector? | electronics | 2017-10-10T11:51:02.343 |
[
{
"message": "For general purpose PCBs that consist of an MCU (simple 8-bit, 20MHz), switching vreg (1.5MHz), and perhaps some SPI and I2C clients (such as sensors, wifi, gps modules, etc), what are recommended and typical baseline capacitors recommended to place near the power supply pins of each component?I r... | Bypass capacitor selection for <100MHz PCBs | electronics | 2017-10-10T14:43:14.630 |
[
{
"message": "I am looking for literature for Comparison between 868 MHz, 915 MHz and 2.4 GHz wireless communication system. For example under what condition I should use 868 MHz or when I should not use 868 MHz. What are the advantages and disadvantages of this frequencies. I am interested only in terms of p... | Propagation comparison between 868 MHz, 915 MHz and 2.4 GHz | electronics | 2017-10-10T23:15:36.607 |
[
{
"message": "In many circuit design examples I see the diode drop is taken constant value such as 700mV. And I also know that for amplification and small signals transistors are used as discrete components.<a href=\"http://whites.sdsmt.edu/classes/ee320/notes/320Lecture4.pdf\" rel=\"nofollow noreferrer\">Here ... | When should the AC resistance of a diode be taken into account in a practical circuit? | electronics | 2017-10-11T03:35:29.043 |
[
{
"message": "I'm trying to identify a fault on a printed circuit board in a consumer product. So I tried to find a pin-out diagram, specifications, etc. for this surface mount component designated AA3 03:There are two of them. I imagine they are ~3V voltage regulators for some small krypton light bulbs wired u... | Component ID: AA3 03 | electronics | 2017-10-11T09:42:12.787 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/Abk4I.png\" rel=\"nofollow noreferrer\">I hope this is not a wrong place to ask. I've just started studying electrical engineering and I have (a newbie) question and would really appreciate it if you guys could help me.So I have this curcuit and I have to calcul... | How to calculate current on different resistors | electronics | 2017-10-11T13:04:52.973 |
[
{
"message": "I am looking for the transfer function of three cascaded RC filters:<a href=\"https://i.stack.imgur.com/JtL7Q.png\" rel=\"nofollow noreferrer\">I have found the solution for two RC cascades (components differently labeled):<a href=\"https://i.stack.imgur.com/aYH3K.png\" rel=\"nofollow noreferrer\"... | Transfer function of three cascaded RC filters? | electronics | 2017-10-11T21:25:05.277 |
[
{
"message": "I think there are 6 nodes(as I've labelled in the picture),8 branches and 6 loops in the circuit.But which resistors are parallel to each other?R7||R4,R2||R5||R3 + R6 ?I'm really not sure.Can someone give an answer an explain?",
"role": "user"
},
{
"message": "In schematics, we can thi... | Basic circuit analysis?Which are parallel? | electronics | 2017-10-12T09:53:33.683 |
[
{
"message": "Have a few problems with my assignment. <a href=\"https://i.stack.imgur.com/3LHFc.png\" rel=\"nofollow noreferrer\">Ive derived a truth table and come up with this : <a href=\"https://i.stack.imgur.com/iGrcu.png\" rel=\"nofollow noreferrer\">Can someone verify if the above is correct?Ive then got ... | Digital Logic Circuit | electronics | 2017-10-12T10:56:45.323 |
[
{
"message": "I'm currently trying to implement an opto-isolator into my project currently I have my code to run perfectly with out the implementation, but I was wondering how I can effectively control my RG LED (which I am restricted to using a common cathode)I know my schematic is wonky :p I was just trying t... | Isolating Bi-Colored LED from MCU/Arduino | electronics | 2017-10-12T14:38:02.183 |
[
{
"message": "I'm trying to bias the bjt amp with two voltage sources and make the collector of bjt at 0.5V to maximize output swing but the simulation give me too much different result, why? The collector current I choose - 5ma, R4 voltage drop - 1V, XMM1 shows 3.6V<a href=\"https://i.stack.imgur.com/xSg3E.png... | Bjt amp with 2 voltage sources bias point | electronics | 2017-10-12T15:54:49.927 |
[
{
"message": "I'm trying to bias the bjt amp with two voltage sources and make the collector of bjt at 0.5V to maximize output swing but the simulation give me too much different result, why? The collector current I choose - 5ma, R4 voltage drop - 1V, XMM1 shows 3.6V<a href=\"https://i.stack.imgur.com/xSg3E.png... | Bjt amp with 2 voltage sources bias point | electronics | 2017-10-12T15:54:49.927 |
[
{
"message": "So, I know that when you're talking about something like a circuit that includes a battery, a circuit LOOKS like a loop, but that's merely because of the fact that the power supply is physically close to the output. However, this doesn't have to be the case, right? Batteries are just self-containe... | Why are circuits considered loops? | electronics | 2017-10-12T17:13:49.627 |
[
{
"message": "I have an SPI module which has an initializer function:<pre><code>static volatile uint8_t *registerOut, *registerIn, *registerDir;static uint8_t clock, dataIn, dataOut;void SpiInit(volatile uint8_t *pRegisterOut, volatile uint8_t *pRegisterIn, volatile uint8_t *pRegisterDir, uint8_t pC... | Is it possible to access semantically connected registers generically? | electronics | 2017-10-13T08:58:29.517 |
[
{
"message": "I'd like to use a momentary switch with a simple circuit (like the one below), that will illuminate two lamps for a short period (i.e. 10-20 seconds) with a single push.Obviously 555 timers are popular for this kind of thing; and I've experimented with them a bit. But I'm currently examining a dev... | Discrete one-shot lamp timer circuit | electronics | 2017-10-13T11:01:37.800 |
[
{
"message": "I have an Atmega328P MCU that is driving a stepper motor driver using its digital I/O. However, I'd like to use the same pins to drive the motor externally as well possibly using a different MCU or hardware. When the external driver is driving the motor using these same pins, the Atmega328P MCU ma... | Isolating digital I/O on an Atmega328 | electronics | 2017-10-13T14:35:57.550 |
[
{
"message": "I have a device X (talking toy), which has a jack of two wires for an external button. That is, I can short the two wires and device X accepts it as a press of a button.Now, I want to use device X for it's function, but replace mechanical button with a capacitive sensor. I have options, but lets a... | Capacitive sensor as drop-in replacement for mechanical button | electronics | 2017-10-14T09:38:51.533 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/fpfCx.png\" rel=\"nofollow noreferrer\">I built this circuit to have oscillations between 20kHz to 30kHz. Unfortunately the oscillations come out very tiny and very irregular. What should I modify or add and why to make the oscillations work?",
"role": "user... | Trying to build a Wien bridge oscillator, but can't make the oscillations work. | electronics | 2017-10-14T15:32:17.773 |
[
{
"message": "I'm starting to simulate a complicated schematic in Altium which looks in LTSpice like this:<a href=\"https://i.stack.imgur.com/4eOCO.png\" rel=\"nofollow noreferrer\">In Altium I can split this scheme into several sheets to make it more convinient to work.So I make part of the scheme (generator.S... | Simulation in Altium Designer: how to simulate multi-sheet schematics? | electronics | 2017-10-14T17:53:04.863 |
[
{
"message": "I have developed a computer controlled BBQ smoker, using a raspberry pi and car throttle valve damper, driven by a stepper motor, the temperature pick up is a thermocouple.I have a python PID class to control the system and am struggling to tune it. When the set point temperature is reached (risi... | Suggestions for tuning slow response pid - fire box control | electronics | 2017-10-14T22:23:23.277 |
[
{
"message": "So I was getting ready to follow this suggestion <a href=\"https://electronics.stackexchange.com/questions/218427/do-bi-directional-level-converters-connect-either-input-directly-to-ground/218449#218449?newreg=6620ffa63ef24c52a728e0138aa9b6dc\">Do bi-directional level converters connect either inp... | general electrical question (with regards to the LBO pin on the Adafruit boost 500 lipo board to a Raspberry Pi) | electronics | 2017-10-15T01:39:24.240 |
[
{
"message": "I think this should work but I would love for someone to confirm it to me. <br/>Transistors aren't really something I'm very familiar with.Goal:<br/>Power on D1750 (Orange LED) when VCC42 is low - Power off when VCC42 is highPower on D1760 (Green LED) when VCC33 is high - Power off when VCC33 is l... | Will this transistor setup work for powering a LED? | electronics | 2017-10-15T12:57:35.837 |
[
{
"message": "I have a pre-built relay module and it apparently takes around 70 mA to activate the coil. However, the relay is a low-level-trigger which requires making a connection from \"IN\" to GND (or GPIO LOW) to activate the coil. In my previous builds I have been using a ULN2003 Darlington array which ... | Does a low level trigger relay module send much current to GND/GPIO LOW | electronics | 2017-10-15T13:27:33.090 |
[
{
"message": "Imagine a Ding Ding doorbell scenario where we want to save our solenoid from burning if a visitor keep the button pressed for a long time.For a 12v Solenoid If power button is turned on I want to send a short pulse to Solenoid i.e It activate it for milliseconds and then deactivate immediately an... | Simple solution to send a short pulse to Solenoid for milliseconds? | electronics | 2017-10-15T20:30:08.963 |
[
{
"message": "I know FETs have a Absolute max \\$|V_{gs}|\\$, and a max \\$V_{ds}\\$. So can we assume, say for an N type, that: $$\\text{max}|V_{gd}| = V_{ds} + |V_{gs}|\\\\$$",
"role": "user"
},
{
"message": "First of all, the oxide layer that separates the drain/source from the gate in the source... | Do FETs have a Maximum Gate-Drain voltage? | electronics | 2017-10-16T01:09:38.003 |
[
{
"message": "Since there is 1byte for nodes' address in Modbus frame, the limit should be around 256.But some say there is some limit on this scenario (RS485, Modbus-RTU) base on chips and wire.<blockquote> Chips support 32 nodes:SN75176,SN75276,SN75179,SN75180,MAX485,MAX488,MAX490 Chips support 64 nodes: ... | Besides address is there other limit on max nodes via RS485 Modbus-RTU | electronics | 2017-10-16T03:35:07.593 |
[
{
"message": "I got one of these DC/DC convert chips thats supposed to give a -25/25 V voltage output.My \"RGZ\" model seems to be outputting -50/50 V and getting toasty. I'm not sure what the COM is supposed to be connected to. I thought it was the \"common\" ground and should be connected to GND but my chip s... | What does the COM do on a DC/DC converter? | electronics | 2017-10-16T05:11:18.577 |
[
{
"message": "Intention is to design a comparator with following specification:Input: 0V to 1.65V, Output: LowInput: 2.1V to 5V, Output: High<a href=\"http://www.ti.com/lit/ug/tidu020a/tidu020a.pdf\" rel=\"nofollow noreferrer\">This is the TI design doc I have refereed for the design.Please see the circuit diag... | How to design a comparator using op-amp? | electronics | 2017-10-16T16:04:55.160 |
[
{
"message": "I can't transform this circuit in an exclusively NOR and another NAND circuit.Everytime I tryed to simulate both circuits, neither of them gave me the correct result.<a href=\"https://i.stack.imgur.com/t2MVn.png\" rel=\"nofollow noreferrer\">F=(notB)+AC<a href=\"https://i.stack.imgur.com/EZ6eX.png... | Transforming logical circuit in NANDs and ORs | electronics | 2017-10-16T18:58:03.380 |
[
{
"message": "Let's say I'm using a 100% efficient battery (AC battery, so there's an inverter in front of it) to power a motor with a power factor of 0.5. Let's also assume the inverter cannot correct the power factor for some reason (normally they can, right?) and is 100% efficient. Let's also assume 0 resist... | How does a bad power factor affect batteries with inverters? | electronics | 2017-10-16T22:17:59.767 |
[
{
"message": "I have a high end audio application in which I'm using the <a href=\"http://www.ti.com/lit/ds/symlink/ne5532.pdf\" rel=\"nofollow noreferrer\">NE5532 opamp. I'm processing an audio signal with 10Vpp swing (so between +5V and -5V) in an audio ADC input stage. Does it make any difference for the aud... | for an audio signal within the rails of an opamp, can its quality be improved by the + and - rail voltages? | electronics | 2017-10-17T00:19:51.560 |
[
{
"message": "My power electronics professor spent most of his life in the time domain and in application-specific theory (SMPS-only vocabulary).For me, a buck converter is basically a square wave (generated by a switch) passed through an LC filter.The square wave's fundamental frequency and its harmonics are f... | Why do we use closed-loop feedback in buck converters? | electronics | 2017-10-17T10:32:03.603 |
[
{
"message": "Please do keep in mind that I have no background in electronic communication. The idea is to receive data from electronics at long distances. The distance I will be looking at to read data from electronics is around 10 km (6 miles) and possibly at a later stage longer distances and I would like to... | How to transmit data over a long distance at a affordable price | electronics | 2017-10-17T12:20:41.537 |
[
{
"message": "Preface: I don't have any MAX232 ICs handy, and only need unidirectional communication (from TTL to RS232). It's just a quick test to see if an old GPS OEM board still works. I don't have any MOSFETs on hand either - just some basic BJTs, as shown in the schematic. I'm using a dual supply instead ... | TTL to RS232 logic translation | electronics | 2017-10-17T16:57:52.893 |
[
{
"message": "I have this <a href=\"https://www.digikey.com/product-detail/en/te-connectivity-alcoswitch-switches/AV2210EA12Q04/450-2531-ND/7390529\" rel=\"nofollow noreferrer\">push-button switch which has two solder lugs for 12 VDC power and will illuminate red or green depending on the polarity of the wiring... | Control color of Bi-Color LED using Arduino | electronics | 2017-10-17T20:28:32.527 |
[
{
"message": "In motor-drives textbooks (e.g Ned Mohan's Electric Motor Drives), the text states that the stator windings on ac machines (e.g. PMAC three-phase motors and induction machines) are, in theory, sinusoidally distributed in the air gap. That is, the conductor density as a function of the mechanical a... | Do stator windings on a permanent-magnet synchronous three-phase ac motor have sinusoidal distributions? | electronics | 2017-10-17T20:39:52.477 |
[
{
"message": "SetupI am using an STM32F103C8T6 (aka Blue Pill).With the STM32Cube I set CAN_RX to PB8 and CAN_TX9 to PB9 (these are defaults/nonchangeable).Circuit<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fO98y9.png\">simulate this circuit – Schematic created using <a href=\"http... | STM32 HAL_CAN_Transmit always returns TIMEOUT (HAL_CAN_STATE_TIMEOUT) | electronics | 2017-10-17T22:51:51.150 |
[
{
"message": "I don't know why but i'm not getting 5v on the input of the Arduino, the only thing I've done is to add a switch in order to interrupt the circuit. Here it's my schematic:<a href=\"https://i.stack.imgur.com/2JLFH.png\" rel=\"nofollow noreferrer\">I have another issue with the battery charger, I do... | Won't get 5v on input of Arduino with power bank | electronics | 2017-10-18T11:34:44.120 |
[
{
"message": "This is a charging ic/circuit from an iPhone and there aren’t any datasheets available for it. I have a few questions:What would the purpose of the series capacitor c2300 on the switching side be for? What are PMID capacitors for?Why would q2301 be used if it looks to always be on when 1.8v is at ... | Buck converter with no datasheet questions | electronics | 2017-10-18T11:43:16.790 |
[
{
"message": "i'm starting get into designing some IOT devices for around the house and looking other peoples design on Hackster.io. I've come across several designs that i'm having a hard time understanding. The below picture to me doesn't make sense. My understanding is the the electric flow starts with p... | Understanding how Schematic works | electronics | 2017-10-18T16:20:22.793 |
[
{
"message": "i'm starting get into designing some IOT devices for around the house and looking other peoples design on Hackster.io. I've come across several designs that i'm having a hard time understanding. The below picture to me doesn't make sense. My understanding is the the electric flow starts with p... | Understanding how Schematic works | electronics | 2017-10-18T16:20:22.793 |
[
{
"message": "i'm starting get into designing some IOT devices for around the house and looking other peoples design on Hackster.io. I've come across several designs that i'm having a hard time understanding. The below picture to me doesn't make sense. My understanding is the the electric flow starts with p... | Understanding how Schematic works | electronics | 2017-10-18T16:20:22.793 |
[
{
"message": "In one book I found that snippet. Can anyone explain me why the input may go below 0?<a href=\"https://i.stack.imgur.com/gt3Az.png\" rel=\"nofollow noreferrer\">There is a text with that pic: \"The limit here is one diode drop belowground, at which point the base of Q3 will forward-bias against th... | pnp differential input stage features | electronics | 2017-10-18T18:18:27.027 |
[
{
"message": "I am not experienced with log amps, and am trying to learn about them.Every log amp article has the base of the logging transistor grounded.<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f2K8Vq.png\">simulate this circuit – Schematic created using <a href=\"https://www.c... | Why are all log amp examples with common base logging transistors? | electronics | 2017-10-18T19:15:27.293 |
[
{
"message": "it's about 2 days that i'm thinking that how a circuit can have infinite number of answers.for example, consider the following circuit:<a href=\"https://i.stack.imgur.com/MzCwP.png\" rel=\"nofollow noreferrer\">for vs=1v & R=2 ohm, if we write kvl two times for this circuit, it's gonna have in... | electrical circuit with infinite answers | electronics | 2017-10-19T05:54:53.460 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/tVOgx.jpg\" rel=\"nofollow noreferrer\">I am experimenting with energy harvesting using electromagnetic induction.I am using the [LTC3108(Ultralow Voltage Step-UpConverter and Power Manager) circuit.==><a href=\"http://cds.linear.com/docs/en/datasheet/3108fc.pdf... | Energy Harvesting IC datasheet question | electronics | 2017-10-19T11:13:45.007 |
[
{
"message": "Fault current = supply voltage / fault path R.Assume live conductor of 230v touches the equipment metal frame. 1) assume R path through grounding electrode 25 ohmI= 230/25=9.2A2) R=3 ohmI=76.6 A3) assume i have conductor for fault path 0.5 ohmI=460Aif in any case of the which -above v =I*R=230V !!... | how decreasing ground fault resistance decrease the touched voltage? | electronics | 2017-10-19T18:39:41.423 |
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