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": "Looking for a simple circuit which output is only active when its input is a low frequency (0.2-0.5Hz) pulse. The circuit output should be deactivated if input is unchanging.I tried monostable 555 circuit, but its output is active as long as input is zero. I also tried a capacitor between input an... | Circuit activated by pulse | electronics | 2017-08-21T21:02:37.520 |
[
{
"message": "I came across to Shannon’s formula for calculating channel capacity and I don’t quite understand why we calculate average signal power… “over bandwidth”. Why over that \"domain of interest\"? Here is my interpretation why but I’m not sure if I understood it right.Imagine we are sending some signal... | What is "average recieved signal power over bandwidth"? | electronics | 2017-08-22T11:55:16.297 |
[
{
"message": "I've built an esp8266 based web thermostat to control my heating system. Everything seems to be working fine for the moment :) What I want to accomplish is \"sniff\" or intercept the boiler´s status from the front panel's status LEDs, to see if this heater is actually turned on, on a MQTT Dashboa... | "Sniffing" into a Boiler's LED panel (Central Heating) | electronics | 2017-08-22T17:28:45.397 |
[
{
"message": "Can someone help me to understand what we expected in the output(Voutn,Voutp) of the circuit of figure 1?I have searched for months a lot of books but I can't understand the operation of the rail to rail stage.Why someone to use it? The rail to rail stage will amplify furthermore the signal vin1(w... | Rail to rail amplifier analysis problem | electronics | 2017-08-22T20:10:13.827 |
[
{
"message": "I found the following circuit interfacing with a GPIO input on an MCU that has an internal pull up resistor. The GPIO is being used to detect the state of the push button. I have two questions regarding this circuit:How does the inductor debounce the push button?What is the purpose of the diode he... | Debouncing Circuit with Schottky Diode | electronics | 2017-08-22T20:18:26.473 |
[
{
"message": "I understand the point of an LC circuit in a Tesla Coil: add an increasing amount of energy to the circuit with each cycle in resonance, but how does the Primary Coil complete this? Specifically, I was wondering about the Spark Gap. I understand that the Spark Gap, once it fires, will complete the... | Spark Gaps on a Tesla Coil | electronics | 2017-08-22T21:26:58.700 |
[
{
"message": "I'm preparing to calibrate some current sensors for a system with DC 13.6V power, and various loads, from well under an amp, up to about 4 amps. I bought some 2, 3 and 5 ohm power resistors, and plan to arrange them in various series and parallel networks to calibrate each current sensor using a l... | Tool for "designing" a resistor network? | electronics | 2017-08-22T22:44:16.827 |
[
{
"message": "I'm preparing to calibrate some current sensors for a system with DC 13.6V power, and various loads, from well under an amp, up to about 4 amps. I bought some 2, 3 and 5 ohm power resistors, and plan to arrange them in various series and parallel networks to calibrate each current sensor using a l... | Tool for "designing" a resistor network? | electronics | 2017-08-22T22:44:16.827 |
[
{
"message": "I want to test a Constant Current LED Driver across its voltage range without using a LED for test purpose. How can I clamp the output voltage of this driver to required voltage levels?For Example - LED Driver Ratings - 800mA Constant Current Voltage Range - 17V to 34V.Now how do I test this drive... | Clamping Constant Current LED Driver Output Voltage | electronics | 2017-08-23T02:08:27.413 |
[
{
"message": "I will use <a href=\"http://www.st.com/content/ccc/resource/technical/document/datasheet/44/f7/9d/99/42/20/45/fd/CD00000534.pdf/files/CD00000534.pdf/jcr:content/translations/en.CD00000534.pdf\" rel=\"nofollow noreferrer\">this comparator with 12V DC single supply.Some of the pulse inputs to this c... | Can this comparator input exceed its supply voltage? | electronics | 2017-08-23T08:35:18.020 |
[
{
"message": "So I built the following circuit to amplify the output from my microphone. I am testing it using a 1KHz sinewave of 10mV peak value. The Mic is biased using a 10k resistor. The signal is input into a common emitter amplifier with a AC gain of around 115. Next to connect the speaker, I used a Commo... | BJT 2 stage Amp. Output problem | electronics | 2017-08-23T09:47:22.947 |
[
{
"message": "Take a DC motor, as the one in the picture below:<a href=\"https://i.stack.imgur.com/S41kn.jpg\" rel=\"nofollow noreferrer\">I need some kind of analogic signal (preferably proportional to the speed of the motor) that can be used in a control loop.What are two simple ways of achieving this? (One w... | How to output a voltage proportional to the speed of a DC motor? | electronics | 2017-08-23T13:01:54.367 |
[
{
"message": "I'm looking to use a CD4051B multiplexer as a digitally-controlled switcher for audio signals. The audio is coming from the HP / BP output of a voltage-controlled filter in a synth. The signal output is about 3v peak-to-peak. The mux select will be controlled by 5v TTL logic.I only have supply vol... | Can a 4051 Multiplexer accept +/- 12v bipolar power | electronics | 2017-08-24T06:21:07.270 |
[
{
"message": "<blockquote> <a href=\"https://i.stack.imgur.com/Du43u.jpg\" rel=\"nofollow noreferrer\"></blockquote>attempt:-BY applying virtual ground i will get Vo=2vnow applying nodal at non inverting terminal i will get (V-2v)/R=I now from this i will get V/I=-R.but the answer given is Option B mean only R... | Find input resistance? | electronics | 2017-08-24T08:55:22.337 |
[
{
"message": "The excerpt below is from Multi-level conversion: High voltage choppers and voltage-source inverters by T.A. MEYNARD, H. FOCH.Question:From the figure, how do you know that the voltage drop across each switch is E/2? For realistic model, every switch has parasitic capacitance between its terminal ... | What is the voltage drop across each open switch in series connection? | electronics | 2017-08-24T11:07:59.937 |
[
{
"message": "I'm trying to understand /simulate the communication between 2 smartphones by means of ultrasounds. As this is a general study I'm considering that the smartphones are equipped with the \"typical\" most common kind of transducers. One of them is broadcasting a sound and the other recording it. I w... | Understanding digital MEMS microphone sensitivity and obtained bits for a given input SPL | electronics | 2017-08-24T15:58:44.973 |
[
{
"message": "I have a \"coin mechanism\" from a fruit machine that I want to connect up. It has two plugs. One is 17 pins and one is 22 pins. The connections are the 2.54mm connectors and the instructions say I need a \"17 Way Molex SIL 6471\" connector.<a href=\"https://i.stack.imgur.com/Zy6BM.jpg\" rel=\"nof... | What socket and terminals do I need to buy for this plug? | electronics | 2017-08-24T19:42:49.407 |
[
{
"message": "EDIT: Added a solution that may work. Please see the bottom for update.As you can see in the photo, (sorry for the bad schematic, I am new to this) I want to have sufficient power to all the LEDs but am not sure how strong a power supply I will need for this to work without burning the LEDs. I see... | LED Strip setup on stairs. Unsure which power supply will work for 1200 LEDs | electronics | 2017-08-24T20:11:27.867 |
[
{
"message": "I want to make a kill-switch pedal with on/off LEDs for my guitar. I tested a simple <a href=\"http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000015625+10.20027730826997+50+5+50%0A162+32+144+256+144+1+2.1024259+1+0+0+0.01%0A162+128+176+240+176+1+2.1024259+1+0+0+0.01%0Ar+128+240+128+304+0+... | Kill Switch schematic | electronics | 2017-08-24T21:07:46.227 |
[
{
"message": "I repair laser tag vests and on the phaser board is a strange component on what appears to be the phaserboard. See the black box on the center of the bottom, close to the left edge of the ribbon cable.<a href=\"https://i.stack.imgur.com/d4MxL.jpg\" rel=\"nofollow noreferrer\">It has no reliably me... | Unknown inductor in power delivery | electronics | 2017-08-25T01:28:11.070 |
[
{
"message": "Suppose I listen to some music on my headphones. Now change the amplitude (in volts, as measured e.g. with an oscilloscope) of the audio signal by a constant factor G.Assuming that the amplifier in question is linear in the region we are talking about, how does this change the audio signal's power... | How does doubling the voltage amplitude change the decibels? | electronics | 2017-08-25T12:56:28.340 |
[
{
"message": "I have an STM32F051 MCU, A XBEE module and an analog sensor I want to read its value using my MCU. I've read (and also practiced in action) that to have a precise ADC readings(which is important for my application), you have to separate analog and digital grounds, like this figure:<a href=\"https:... | Where to put regulator when separating analog and digital grounds? | electronics | 2017-08-25T13:17:28.817 |
[
{
"message": "I have a temperature controller with two SPST relay contacts, one each for heating and cooling, and I want to use them to control a Peltier thermoelectric cooler (TEC), plus a fan and pump and potentially a few other widgets.When either the heating or cooling activates, the auxiliary devices (fan,... | How to reverse polarity on only one device? | electronics | 2017-08-25T19:07:02.353 |
[
{
"message": "First of all, I have read many articles about the non-linear effects of voltage vs current of LEDs. I also know that current will rise as temperature rises, batteries have resistance, LEDs brightness is not linear. All in all, LEDs are finicky devices.But lets say we have a 100% perfect scenario: ... | Effects of current/voltage limiting of LEDs | electronics | 2017-08-26T09:07:28.433 |
[
{
"message": "What are these components? They have lots of wiring.The left (bigger) one has 2 pins and description00846R647 YThe right (smaller) one has also 2 pins and description94565R652What kind of components are these?<a href=\"https://i.stack.imgur.com/sF25R.jpg\" rel=\"nofollow noreferrer\">Possibly simi... | Two tube coil components | electronics | 2017-08-27T13:44:33.203 |
[
{
"message": "I wanted to know whether connecting two or more simple diac-triac ac lamp dimmers in parallel with the same load cause any problems?I do not want to connect them in series, just parallel will be enough.The dimmer circuit is the common diac-triac dimmers found in stores and wired in paralled like t... | Two or more Diac Triac dimmers in parallel | electronics | 2017-08-27T15:42:59.943 |
[
{
"message": "I'm integrating two circuits into one. One being an Arduino Pro Mini (ATMega328P) and the other being a CAN controller+transceiver.For the Aduino Pro Mini, I'm using a TLF80511TF50 (5V LDO). I've not yet calculated the values here, but they don't matter for the question, I think. The Pro Mini uses... | multiple decoupling capacitor circuits (integrating multiple circuits) | electronics | 2017-08-27T16:21:02.717 |
[
{
"message": "I am trying to understand a bit how the IO pin works. I took as an example this <a href=\"http://ww1.microchip.com/downloads/en/DeviceDoc/39564c.pdf\" rel=\"nofollow noreferrer\">PIC.The image of the IO pins are like this :<a href=\"https://i.stack.imgur.com/r5Is1.jpg\" rel=\"nofollow noreferrer\"... | understanding how PIC GPIO work | electronics | 2017-08-27T20:02:47.830 |
[
{
"message": "I purchased an old over-head pin router for my woodshop. It uses two solenoid valves. They are apart of the assembly that lowers and raises the rotating spindle. When the electric foot pedal is pushed, I would have assumed that the first solenoid would be activated, (allowing the air to lower th... | Two solenoids lower spindle, but it won't raise again... suggestions? | electronics | 2017-08-27T21:50:50.013 |
[
{
"message": "I have acquired a LT1512 Sepic based controller which is a controller for charging purposes.I have followed the datasheet as much as can, read few articles on how to set it up for my purposes, charging SLA battery.Very few information found, some on inductor specs, but continued with the datasheet... | Sepic based charger | electronics | 2017-08-28T04:25:37.450 |
[
{
"message": "I want to supply constant voltage to my LED's but the supply varies from 3.7V to 4.2V (Li-ion battery). I cannot use 3.3V voltage regulator as it will need at least 4.3V voltage at the input but my battery can supply only 4.2V max.so is there any other way I can supply regulated 3.3V to my LED.RGB... | How to drive multiple LEDs from a Li-ion battery (with varying voltage)? | electronics | 2017-08-28T05:21:08.177 |
[
{
"message": "This seems to be an easy problem but i cannot figure out how to do it. I have to use switch in my design so that when the voltage across two points excess a fixed amount the switch should be connected to port 1 otherwise port 3. To use that i use control port which is port 2 bu i cannot connect th... | Connecting switch to a resistor in Simulink | electronics | 2017-08-28T08:50:24.577 |
[
{
"message": "I have a load driven at 24VDC that draws very high current for a short period of time. The following picture is the output of a current amplifier, it reads 2A/V, meaning I have to deal with roughly a 18A pulse that lasts for 50ms.<a href=\"https://i.stack.imgur.com/2Ylt1.jpg\" rel=\"nofollow noref... | Output capacitor size for Boost converter under pulsed load | electronics | 2017-08-28T17:39:36.850 |
[
{
"message": "Say for instance, the goal is to light an incandescent bulb for x amount of seconds (let's say 20).<br>What is the simplest configuration possible?Of course, simple timer circuits aren't rare, and can be found easily online. A simple search engine query will show this. The thing is; they often var... | What is the simplest possible monostable 555 timer circuit? | electronics | 2017-08-28T19:29:05.690 |
[
{
"message": "I am struggling to get multiple read from the RHR register working on my SC16IS750 breakout board. I am using the board with I2C standard frequency, normal single reads and write are working fine.<br>The chip has a FiFo which can hold up to 64 characters. The Fig 24 in the Chip Manual (<a href=\"h... | Sparkfun SC16IS750 multiple read | electronics | 2017-08-29T06:41:32.523 |
[
{
"message": "I completely understand the working principle of light dependent resistor. But there is one thing I am bothered about:Does the LDRs surface has to be equaly illuminated upon all its surface/upon all its photoresistive track? Or it doesn't really matter, if all of its photoresistive track is illumi... | LDR Photoresistive Track | electronics | 2017-08-29T10:17:26.673 |
[
{
"message": "For example if my boolean expression is defined by the function f(x,y)= x+xyz+yzx'+wx''+w'x+x'y+1. I know that A+1=1 no matter how A is. But if they ask me to represent the circuit with logic gates, what is the representation of it? I mean they generally ask me to simplify the expression in order ... | how to represent a circuit when a simplified expression is just 1 or 0? | electronics | 2017-08-29T16:09:02.620 |
[
{
"message": "I've got a lot of experience with rather \"low-level\" electronics (resistor networks, passive filters, basic op-amp circuits) and some experience with higher-level stuff like micro-controllers, but I am currently struggling with learning the bits in between. As such, apologies if this question is... | Capacitor after Voltage Reference "for stability" | electronics | 2017-08-29T17:18:18.517 |
[
{
"message": "I am designing a PCB and there will be high voltages. What is the recommended clearance that I should have between two traces that have a voltage difference of 1000VDC and 2000VDC?Additionally, is there an equation that I could use to calculate clearance depending on voltage?",
"role": "user"
... | Minimum clearance between two traces that have a potential difference of 1000VDC | electronics | 2017-08-30T00:42:42.840 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/DUnav.png\" rel=\"nofollow noreferrer\">I have this design.<br>Mounted on \"Project Board\" and \"Universal PCB\" it works great.But soldered in a specially designed PCB only works fine for the first 10 tries, every 2 seconds, high work load.All 3 versions use s... | MOC3021 appropriate input resistance value for microcontroller application | electronics | 2017-08-30T01:33:17.650 |
[
{
"message": "I am designing a device that does not have an external bus interface and requires a modest ram size for binary data buffering. 16mb would be great, more would be awesome.It's quite easy to find SPI flash that are 32 - 64 mb, but a lot more complex to find > 4 mb SPI RAM.I found one 4mb at cypress ... | BIG SRAM with no parallel interface / SPI based? | electronics | 2017-08-30T10:05:23.257 |
[
{
"message": "This is usually easy but there are things I haven't encountered in this one. This is the problem. $$\\dot x=\\begin{bmatrix}0&1\\\\-2&-3\\end{bmatrix}x+\\begin{bmatrix}0\\\\2\\end{bmatrix}u=Ax+Bu\\\\y=\\begin {bmatrix}0&1\\end{bmatrix}x=Cx\\\\x(0)=\\begin{bmatrix}1\\\\0\\end{bmatrix}$$... | Find output given state space representation | electronics | 2017-08-30T13:22:13.880 |
[
{
"message": "Update 1 :After some help and advices from nice people here i'm going to use this circuit :<a href=\"http://everycircuit.com/circuit/5857347480322048\" rel=\"nofollow noreferrer\">http://everycircuit.com/circuit/5857347480322048<a href=\"https://i.stack.imgur.com/VAVVs.png\" rel=\"nofollow norefer... | Transistor Switch for my Raspberry Pi 3 FAN | electronics | 2017-08-30T15:03:28.193 |
[
{
"message": "I'm having a hard time grasping the relation of Fourier analysis to the nature of signals and spectrum analyzers. From what I understand, Fourier analysis gives us a mathematical representation of a signal, but we don't need a infinite number of harmonics to make a square wave, for example. So if ... | Understanding Fourier, signals and spectrum analyzer | electronics | 2017-08-30T15:05:05.997 |
[
{
"message": "Can anyone help identify connector type for A & C below or suggest site/keywords I could use to narrow search? I have sent inquiry to several sites selling automotive connectors and Googled extensively but no success :-(<a href=\"https://i.stack.imgur.com/RCiY9.jpg\" rel=\"nofollow noreferrer... | Identifying OEM amp Connectors | electronics | 2017-08-30T17:25:49.257 |
[
{
"message": "I'm trying to extract data from a 4x14 segment alphanumeric display controlled via 2*595 in series and 4 transistors. Serial data is fed from STM32f103, its firmware should not be changed.Problem is that Atmega running 16MHz can't cope with 2.2MHz SPI clock from ARM. And it is a 16bit continuous w... | Tapping SPI communication with 328U | electronics | 2017-08-30T17:50:53.687 |
[
{
"message": "I would like to assemble a few SMA connectors on 0.086\" semirigid coaxial cable.Here is an image of the assembly instructions on one such part (Amphenol 901-9723).<a href=\"https://i.stack.imgur.com/HW9sy.png\" rel=\"nofollow noreferrer\">As you can see, the outer jacket of the cable and dielectr... | What tool is used to cut back the outer jacket and dielectric of a coaxial cable? | electronics | 2017-08-30T17:57:00.663 |
[
{
"message": "I've been in the habit of making vias on homemade pcb's by putting the leg of 1N4148 diode into a 0.5 mm hole, cutting it off to length and soldering both sides.However, now my led controller broke and I traced the problem into a broken ground via. On closer inspection, the wire has separated from... | Why did my solder joint fracture? | electronics | 2017-08-30T19:58:46.893 |
[
{
"message": "I have <a href=\"https://brodersencontrols.com/images/pxf-20_11.pdf\" rel=\"nofollow noreferrer\">this frequency to analogue signal converter and I'm very confused about using it with NPN inputs.Here is the only block diagram they provide in their manual:<a href=\"https://i.stack.imgur.com/nyToN.p... | Confusion with NPN input wiring to a converter | electronics | 2017-08-30T23:34:29.040 |
[
{
"message": "As an amateur to breadboarding I'd been learning about transimpedance amps and photodiodes earlier this year for a project. Eventually I picked up a phototransistor (3DU5C) at a hobby shop, mistaking for a PD, so I learned a bit about them and found this circuit on physics portal after failing to ... | phototransistor amplifier quirk | electronics | 2017-08-31T03:02:22.723 |
[
{
"message": "I have a Smart Switch (Sonoff Dual WiFi Wireless Smart Switch), and I control it through a Google Home. It works as a contact, like if it was a switch:<a href=\"https://i.stack.imgur.com/LgHwX.png\" rel=\"nofollow noreferrer\">I want to control an electric blind, that has this connections:<a href=... | Control Direction of Motor | electronics | 2017-08-31T14:34:00.877 |
[
{
"message": "I was looking for a PMIC with battery charger and built-in power path when I came across one of TI's new chip. BQ25601 <a href=\"http://www.ti.com/product/BQ25601\" rel=\"nofollow noreferrer\">http://www.ti.com/product/BQ25601. while I was trying its performance and doing some tests I noticed that... | PMIC Battery charger and power path | electronics | 2017-08-31T18:25:45.737 |
[
{
"message": "Below, is the SD card reader I would like to use. It's using SPI.On an Arduino I got it to work (using SPI).However, I want to test it on a STM32F103C8T6, and later use it in STM32F407VET6. However, I see both the F1 and F4 can use the FATFS file system, which I need, but only the F4 has the SDIO ... | How to (best) use a SPI SD card with STM32F1 or STM32F4? | electronics | 2017-08-31T23:29:56.017 |
[
{
"message": "I'm starting an Arduino project where I plan to turn on some LEDs using analog pins on the arduino. My plan is to use a transistor to turn on the LEDs. I know I can turn on low power ones directly, but I want to use brighter ones (perhaps a <a href=\"http://www.ebay.com/itm/2Pcs-12V-LED-Eagle-Eye-... | Help me identify these two transistors | electronics | 2017-09-01T03:08:53.500 |
[
{
"message": "I am trying to figure out what would be the closed loop transfer function of the <a href=\"https://www.google.ro/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj23JWFw4PWAhUEApoKHf_KDVEQFggqMAA&url=http%3A%2F%2Fwww.linear.com%2Fdocs%2F1485&am... | How to find the closed loop transfer function of the LT1619 current mode controller | electronics | 2017-09-01T09:12:23.463 |
[
{
"message": "Is there any circuit to make incandescent bulbs (60-100W) light up more gradually?I've seen many different devices but none of them would work for me. I do not want to just stop the high current spike while the filament is warming up. I want the bulb to have 1.5-2 seconds delay before glowing full... | Incandescent Light Bulb Soft Start | electronics | 2017-09-01T11:40:42.260 |
[
{
"message": "I have a design that is a offline, single stage flyback, powering two different LED strings. The output of this converter is about 50W and the output voltage can range from 20V-45V. I'm using ST Micro's HVLED001A control IC, if it matters. Each LED string can be commanded by the user to have a ... | feedback loop for a single stage offline flyback that is powering 2 independent LED strings | electronics | 2017-09-01T15:51:34.350 |
[
{
"message": "I want to connect several devices together with this RF module. But it's hard for me to understand the Bascom program. Could you please tell what the main idea is or explain in general for me? Do you know any reference or tutorial video that can help me? thanks<a href=\"https://i.stack.imgur.com/x... | How to program MCU to work with NRF24L01 module in Bascom language? | electronics | 2017-09-01T22:32:07.667 |
[
{
"message": "IntroI have an automotive-type Hall sensor that is slowly failing and want to squeeze a bit more life out of it, since it's costly and not readily available. Not a critical part.Original designThe sensor I assume is a Hall transistor-type arrangement - it takes 12V supply, a 6V pulled-up signal li... | Sensor buffer with minimal component count | electronics | 2017-09-02T12:48:08.483 |
[
{
"message": "IntroI have an automotive-type Hall sensor that is slowly failing and want to squeeze a bit more life out of it, since it's costly and not readily available. Not a critical part.Original designThe sensor I assume is a Hall transistor-type arrangement - it takes 12V supply, a 6V pulled-up signal li... | Sensor buffer with minimal component count | electronics | 2017-09-02T12:48:08.483 |
[
{
"message": "I have an STM32F303 discovery board for which the mems gyro L3GD20H is connected to the SPI1 peripheral by default, that is the Sclk, MISO and MOSI are connected to pins PA5, PA6 and PA7 respectively. The chip enable is connected to PE3. I need to understand the high level functions from the HAL l... | Why will HAL_SPI_Receive() not read the L3GD20H gyro on my STM32F303 Discovery board? | electronics | 2017-09-02T13:33:42.280 |
[
{
"message": "I have a plug-in-supply unit with \"220V ac 50Hz\" input and \"12V rms\" output.My question: Does anybody know how the waveform and the frequency looks like for such a off-the-shelf device? EDIT: It is an italian device called \"Transformatore elettronico\" and the weight is only 70 grams. So it i... | Plug-in supply with ac output | electronics | 2017-09-02T14:37:15.110 |
[
{
"message": "I need to drive a bunch of 7-segments and 14-segments led display (in total, 105 LEDs with common anode).I bought an HT16K33 to drive them, but did not take into account the common cathode requirement...I can't manage to find any chip that could drive them correctly. I need an I2C interface with a... | Commond anode led driver | electronics | 2017-09-02T15:55:11.763 |
[
{
"message": "I have to subtract two binary numbers, each two bits long.so the numbers are x0x1 and y0y1. the result z0z1 has to be the absolute value.At my disposal are: a two bit subtractor (ie it subtracts two numbers of two bits each and puts out two bits which is the result)I also have a magnitude comparat... | absolute numbers subtractor | electronics | 2017-09-02T20:02:00.887 |
[
{
"message": "I'm using an open collector comparator LM339, and I want to isolate V2 from the circuit by a 4N25 optoisolator. I want V(out) to change its state from at least around 1V or less up to 10V. But I get the following result in LTspice IV where Vout swings between 8.5V to 10V:<a href=\"https://i.stack.... | Help with using 4N25 optoisolator | electronics | 2017-09-03T01:06:57.163 |
[
{
"message": "I'm trying to make a USB to 20mA loop converter to connect to Siemens S5 PLC. I asked a question about selecting a good optocoupler to convert the signals <a href=\"https://electronics.stackexchange.com/questions/326379/how-to-select-a-good-optocoupler-for-uart-to-20-ma-current-loop-converter\">he... | The 20mA loop to USB fails midway of connection with unknown reason! | electronics | 2017-09-03T11:19:07.957 |
[
{
"message": "I want an IC that has 8 outputs, that I can connect to 8 LED's in a circle. At any point in time one of the LED's is on. When I press a button, the next one turns on.I know it can be done with 8 flip flops, but I imagine surely there is a ready-made IC I can just use to save time?Thanks.",
"... | An IC that does sequential counting on a clock pulse | electronics | 2017-09-03T13:32:25.917 |
[
{
"message": "I am designing a new circuit, where I need to detect presence of voltage on an external network. Note that I am using the same network (Using LDO) to power up my circuit, so the ground is common. I want to keep it cheap, so cannot afford opto-coupler. The range of voltage to detect is somewhere fr... | MCU interface to detect a wide input voltage | electronics | 2017-09-03T13:55:02.353 |
[
{
"message": "I am designing a new circuit, where I need to detect presence of voltage on an external network. Note that I am using the same network (Using LDO) to power up my circuit, so the ground is common. I want to keep it cheap, so cannot afford opto-coupler. The range of voltage to detect is somewhere fr... | MCU interface to detect a wide input voltage | electronics | 2017-09-03T13:55:02.353 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/pi47j.png\" rel=\"nofollow noreferrer\">The answer is K= 1000 but i dont get why. Calculating gives me G(0)=0.001",
"role": "user"
},
{
"message": "Your transfer function is given by the following expression:\\$H(s)=k\\frac{s(1+s)}{(1+10s)(s+10)(s+10... | How can I find the DC gain or the constant of a given Bode diagram with no y-axis given (H(s)=K(s(s+1))/((10s+1)(s+10)(s+100)))? | electronics | 2017-09-03T15:17:00.960 |
[
{
"message": "My question is about how dangerous a momentary amount of current is vs the duration. Like is there a reasonably consistent relationship between current duration through the body and relative danger? I.e. 1 amp for 1 second vs 0.01 amps for 100 seconds. I imagine that's a bit complex to determin... | Safety of current with duration | electronics | 2017-09-03T16:08:59.803 |
[
{
"message": "Similar to this question here: <a href=\"https://electronics.stackexchange.com/q/64608/127311\">Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino?I want to control about 800 rgb LEDs (800x red signals, 800x green, 800x blue), but unlike what that question asked, ... | controlling many LEDs on an individual basis | electronics | 2017-09-03T19:45:45.323 |
[
{
"message": "I'm using an STM32F103C8T6 (aka blue pill) with Eclipse/System Workbench and HAL.The following code:<pre><code> volatile HAL_StatusTypeDef result = HAL_UART_Transmit(&huart1, bytesToSend + currentSendIndex, bytesPerMessageToSend, 100); volatile uint32_t error = HAL_UART_GetError(&huart1... | How to check overrun? | electronics | 2017-09-03T21:38:27.883 |
[
{
"message": "Contexte: a DIY small wind turbine pancake generator, made with 2 rotor plates of 12 rectangular magnets, and one stator of 9 coil wired. After the generator, the 3 alternative electricity phases are transformed into direct current thanks to 3 bridges rectifier (one for each phase). After the rect... | small wind turbine pancake generator, force of magnets effect on rotation when charging a battery? | electronics | 2017-09-04T10:02:27.383 |
[
{
"message": "I'm trying to replace the old NiMH Roomba battery with a bunch of 18650s recycled from old laptops. Lucky enough Roomba uses 12s NiMH battery, that operates in voltage range 12-18V, and has quite similar characteristics to 4s Li-Ion battery: 12-16.8V. After adding a simple 4s protection board, it ... | How to make Li-Ion mimic NiMH voltages | electronics | 2017-09-04T10:24:53.553 |
[
{
"message": "AD620 is commonly used for DIY EEG/EC/EMG projects. I've seen an instrumentation amplifier that is designed by using 3x TL081 opamp for EEG project.For example : <a href=\"https://i.stack.imgur.com/N2pzP.jpg\" rel=\"nofollow noreferrer\">I've checked that AD620's input offset voltage is in uV and ... | Amplifiers for EEG and Resistor Values | electronics | 2017-09-04T14:45:03.733 |
[
{
"message": "I took apart my LED light fixture to clean its diffuser, when I noticed something odd:<a href=\"https://i.stack.imgur.com/KbUsy.jpg\" rel=\"nofollow noreferrer\">As you can see, it has a DC power source connected to 4 daisy chained circuits. I expected that these 4 circuit boards to be connected i... | What is the purpose of these P+ and P- connections? | electronics | 2017-09-04T16:23:19.060 |
[
{
"message": "I have two momentary switches, one to activate a solenoid and one to reset it. It is only possible to press zero or one of the two switches at the same time. Using a single battery, how can I wire the circuit so one switch triggers the solenoid (sending current one way) and the other resets it (se... | Using two switches to each send current in opposite directions | electronics | 2017-09-04T21:58:16.957 |
[
{
"message": "I'm currently working on a design with an <a href=\"http://www.ti.com/lit/ds/symlink/adc3424.pdf\" rel=\"nofollow noreferrer\">adc3424 ADC with 125 MHz sampling frequency. This is my first design with an ADC and I assumed picking an anti-aliasing filter (AAF) would be a trivial task. Linearity or ... | Anti-aliasing filter with a higher corner-frequency (>10 MHz) | electronics | 2017-09-05T06:03:45.787 |
[
{
"message": "I have a small circuit, containing 16 VAC (50 Hz) source, AC device and button which closes the circuit (pressed - device is working, released - device stops). I would like to replace the button with something that can be controlled with 3.3 V (planning to connect it to Raspberry Pi). Button is p... | Open/close low voltage AC circuit with 3.3 VDC signal | electronics | 2017-09-05T08:04:46.050 |
[
{
"message": "I need to coarse control the frequency of oscillation on a parallel resonant tank. The frequency band is in the 500kHz-1Mhz range, so the small capacitance of varactors doesn't suit the task. Another way of doing it is by switching a capacitor branch with a MOSFET<a href=\"/plugins/schematics?imag... | Mosfet Switched capacitor in LC tank | electronics | 2017-09-05T11:12:50.687 |
[
{
"message": "I need to sense a logic low on the GPIO. The input will come from external resources (By end user) so I need to protect the circuit as well from high positive voltage. Generally the circuit will be used in places where I don't expect a voltage of more than 30 Volt. So from external input, it can b... | Detecting ground on GPIO and protect from positive voltage | electronics | 2017-09-05T15:51:58.080 |
[
{
"message": "I need to sense a logic low on the GPIO. The input will come from external resources (By end user) so I need to protect the circuit as well from high positive voltage. Generally the circuit will be used in places where I don't expect a voltage of more than 30 Volt. So from external input, it can b... | Detecting ground on GPIO and protect from positive voltage | electronics | 2017-09-05T15:51:58.080 |
[
{
"message": "I have a Microchip PIC161776 running at 32 MHz. Interrupt Code has been generated with MCC, with the preemptive option set.typically, about once every hour the interrupt routine gets called with no apparent set flag.The MCC generates code like:ISR(){if (IF1){}else if (IF2){}else if ...{}else{THIS... | PIC16F1776 interrupt triggered with no evident source | electronics | 2017-09-05T19:29:41.023 |
[
{
"message": "I am doing an electronics project that involves transmitting and receiving information on the 915MHz ISM band. I need to make the enclosure as small as possible. However, that means that I don't have a lot of space for my antenna that is tuned for the 915MHz ISM band.Here is the picture of how it ... | Performance affected by bending flexible PCB antenna? | electronics | 2017-09-06T21:25:03.680 |
[
{
"message": "Hi I am trying to send a pulse over one circuit and recieve it at another.For reference I have replaced the circuit that revices the signal with a resistance connected to ground to act as the load. On changing the load values I find that my circuit is not able to drive the pulses and I wanted to k... | Increase the drive strength of the circuit | electronics | 2017-09-07T00:30:27.173 |
[
{
"message": "Below is part of a BJT current mirror:<a href=\"https://i.stack.imgur.com/rjju2.png\" rel=\"nofollow noreferrer\">I marked the specific nodes of the reference transistor on the left as x, y and z.Many texts claim the following(I tried to summarize):<blockquote> Since the collector of this transis... | Confusion about a basic BJT current mirror | electronics | 2017-09-07T01:21:14.753 |
[
{
"message": "Below is part of a BJT current mirror:<a href=\"https://i.stack.imgur.com/rjju2.png\" rel=\"nofollow noreferrer\">I marked the specific nodes of the reference transistor on the left as x, y and z.Many texts claim the following(I tried to summarize):<blockquote> Since the collector of this transis... | Confusion about a basic BJT current mirror | electronics | 2017-09-07T01:21:14.753 |
[
{
"message": "I'm using the <a href=\"http://www.ti.com/lit/ds/symlink/tps56221.pdf\" rel=\"nofollow noreferrer\">TPS56221 buck converter.500 kHz switching frequency 12V in 5V out, 16A max, 14A load stepI've found out all the values I need, the problem I'm having is finding suitable capacitors. For example I ne... | Capacitor Selection for TPS56221 | electronics | 2017-09-07T11:11:13.423 |
[
{
"message": "How can I explain this with proper reasoning?I'm also having doubt understanding why a proportional controller cannot eliminate SSE and how a PI controller eliminates it.",
"role": "user"
},
{
"message": "It's all about the integrator. An integrator will cause the smallest error to in... | PID control achieves zero steady state error with step set points and disturbances? | electronics | 2017-09-07T13:59:06.707 |
[
{
"message": "I'm designing another Silicon Photomultiplier circuit. Right now, it is in the theoretical stage. My team and I have made numerous circuits, and the basic template is below:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fO8mKo.png\">simulate this circuit – Schematic crea... | Timing Improvements to Silicon Photomultiplier Transimpedance Amplifier Circuit | electronics | 2017-09-07T14:14:55.623 |
[
{
"message": "I need to develop a small autonomous device that could stimulate a touch screen. For the record I need such a device to be able to run some automatic tests on some specific smartphone apps, where touch related functionalities cannot be tested by injecting touch events from USB.Here is my first des... | How to physically stimulate a touch screen with an external device | electronics | 2017-09-07T14:23:04.573 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/HfvXr.jpg\" rel=\"nofollow noreferrer\">So here's the problem, I made the assumption that D1 and D2 are short, whereas D3 is an open, and combined the 500 ohm resistors in series:<a href=\"https://i.stack.imgur.com/MkrG8.jpg\" rel=\"nofollow noreferrer\">But my ... | Circuit with one voltage source, calculating voltages at nodes | electronics | 2017-09-07T20:59:29.783 |
[
{
"message": "I'm looking at this Form C relay: <a href=\"http://www.ixysic.com/home/pdfs.nsf/www/LCC110.pdf/$file/LCC110.pdf\" rel=\"nofollow noreferrer\">IXYS LCC110Its max load current is 120 mA and max voltage is 350 VDC. My question may be dumb, but can I use this relay to safely control a load that is onl... | Relay's maximum rating current and voltage | electronics | 2017-09-08T00:31:46.237 |
[
{
"message": "I know how to calculate the resistance values for a voltage divider without a load on Vout.I would like to know how I would like to calculate the resistance values of a pot (Example 500kΩ pot) used as voltage divider with a load on it. With No Load$$Vo = V_i*\\frac{R_2}{R_1+R_2}$$Is this the corre... | Voltage Divider Equation with Load on output | electronics | 2017-09-08T12:36:24.090 |
[
{
"message": "What do I do so that only specified components are selectable, and the rest are non-selectable?",
"role": "user"
},
{
"message": "Use the \"Locked\" feature (check the \"Locked\" box in the component properties) for the components you don't want to be able to select.<a href=\"https://i... | Altium Designer - Disable components on the PCB editor | electronics | 2017-09-08T18:29:39.790 |
[
{
"message": "I would like to get some input for my very first electronics project.I would like to split the 5V power Voltage to multiple outputs. Furthermore the individual power lines are supposed to be switched by a microcontroller.<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fgsn1Z.pn... | How to switch multiple 5-V loads via microcontroller | electronics | 2017-09-09T06:31:43.783 |
[
{
"message": "I am trying to fit measured transformer data to the standard mathematical transformer model. I have done the short circuit measurement to get leakage inductances and measured DC primary and secondary resistances. I have read that to measure the magnetizing inductance Lm and core loss Rc you can e... | Measuring Transformer Magnetizing Inductance | electronics | 2017-09-09T16:42:45.273 |
[
{
"message": "I have an analog meter. It belongs on an electric e-bike..The default reading is about 88v-84v DC high side and 63v DC low side.It has a resistor and diode on one side then two diodes in series on the other side.I was wondering if I could change this meter to read 140v-130v DC high side than about... | Changing the offset and span on an analog voltmeter | electronics | 2017-09-09T18:20:29.493 |
[
{
"message": "The progress I made is that I used a XOR gate with the complement of R, to be fed as input to each of the first 4 inputs of the decrementer. It doesn't seem to work for all input combinations. I would appreciate some suggestions on modification, as this doesn't lead to correct outputs. <a href=\"h... | I have a 5 bit decrementer. Using control i/p R, use the decrementer and 2-i/p XOR gates to obtain incrementer when R=0 and a decrementer when R = 1 | electronics | 2017-09-09T20:40:08.773 |
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