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": "Hello I'm trying to control the velocity of the propeller with the pitch angle. I have a diagram from the factor cp over J and phi (see image: <a href=\"https://www.draw.io/?lightbox=1&highlight=0000ff&edit=_blank&layers=1&nav=1&title=Regelung%20Propeller.xml#R7V1bb6M4FP41kWYeW... | Closed Loop control of a propeller | electronics | 2018-02-04T21:32:12.773 |
[
{
"message": "EE novice here. In <a href=\"https://www.reddit.com/r/synthdiy/comments/7v12a6/noise_toaster_potentiometer_wattage/\" rel=\"nofollow noreferrer\">this post on reddit, the author wonders if 125mW-rated potentiometers are usable in the <a href=\"http://musicfromouterspace.com/analogsynth_new/NOISETO... | How do I know what power rating pots need? | electronics | 2018-02-05T02:54:09.637 |
[
{
"message": "EE novice here. In <a href=\"https://www.reddit.com/r/synthdiy/comments/7v12a6/noise_toaster_potentiometer_wattage/\" rel=\"nofollow noreferrer\">this post on reddit, the author wonders if 125mW-rated potentiometers are usable in the <a href=\"http://musicfromouterspace.com/analogsynth_new/NOISETO... | How do I know what power rating pots need? | electronics | 2018-02-05T02:54:09.637 |
[
{
"message": "First questionWhether we declare the array as scalar or vector, we can access each element bit by bit. For example, we can declare two arrays below.<pre><code>reg scalar_array[0:9];reg [0:9] vector_array; always @*begin scalar_array[0] = 1'b1; vector_array[0] = 1'b1;end</code></pre>I would like... | What is the difference between scalar array and vector array? | electronics | 2018-02-05T03:54:17.730 |
[
{
"message": "Is it possible to do an LLC resonant converter with an air core transformer (wireless power transfer)? I've read basics about it but I've all read that they use some type of ferrite cores. I think that it should be possible at first but I am having second thoughts based on what I've read but I jus... | LLC resonant converter with air core | electronics | 2018-02-05T05:23:26.650 |
[
{
"message": "I'm planning to build a few 8x8 LED matrix using 1,7/2,3V and 20mA LEDs, and for controlling them, I have purchased a PCB mounting a MAX7219 with an included LED matrix that you can easily detach.Checking the specifications of the PCB, I see it uses a 10k resistor, what makes me doubt if it is a v... | MAX7219 resistor value | electronics | 2018-02-05T11:18:00.083 |
[
{
"message": "I am building a rectifier (~230V+-10%/50Hz) with voltage regulator from scratch. My output needs to be 3.3V with a maximum current(before short-circuit protection trigger) of 16A.<a href=\"https://i.stack.imgur.com/6FK0r.jpg\" rel=\"nofollow noreferrer\">I have chosen three npn transistors in para... | LM317 voltage regulator with high current boost by 3 npn transistors | electronics | 2018-02-05T15:29:13.067 |
[
{
"message": "I wanted to connect a USB HID Controller to an Arduino and use it to control a Remote Controlled car.But I'm unable to find what bit sequence is sent when a button is pressed on the joystick. I would like to find what that sequence is.I'm running a dual-boot system with both Linux and Windows, so ... | Bit sequence from USB HID Joystick | electronics | 2018-02-05T15:57:34.273 |
[
{
"message": "From the photos of this driver board (no hands on testing, the photos are all I have to work with), how can one reason-out the E, B, and C functions of the pins (1,2,3) of the transistor, and the coil pairing of pins (4,5,6,7) on the transformer? Assuming the trace from left side of D5 passes und... | Pin identification of transistor and transformer from photo of module | electronics | 2018-02-05T19:49:52.613 |
[
{
"message": "I have four mini generators run by a blower. Each generator generates about 2 to 3 volts. When I connect all the four generators I get about 10-11 volts of AC. I convert the AC into DC using a bridge rectifier and get about 9-10 DC volts.The moment I connect the DC into a 3 or 6 volt DC motor t... | current back flow? | electronics | 2018-02-05T22:57:33.923 |
[
{
"message": "High-level survey of this question is fine:After reading <a href=\"https://en.wikipedia.org/wiki/Laser_diode\" rel=\"noreferrer\">https://en.wikipedia.org/wiki/Laser_diode I still can't tell if the electronics that enable a diode to lase are different from those that enable it to emit light. So, i... | What makes a LED a laser diode? | electronics | 2018-02-05T23:03:31.293 |
[
{
"message": "(I hope this is not regarded a \"shopping or buying recommendation\" question - in my opinion it is not).In order to split a larger project into more tractable and flexible sub-blocks I create two PCBs (motherboard/daughterboard).This is a very common setup in the digital world (PAM2-PAM4) and the... | Board to Board connection for RF and high-speed digital signals | electronics | 2018-02-06T03:34:40.280 |
[
{
"message": "I have a raspberry pi trying to drive an intercom system. <br>The intercom has a 12V output which when connected to ground opens the door.<br>What I want to do is have the raspberry pi 3V GPIO switch drive the optocoupler and this will ground the intercom opening the door, like below.<a href=\"/pl... | Designer circuit using optocoupler | electronics | 2018-02-06T05:57:20.097 |
[
{
"message": "So I want to build a circuit that can control the intensity of a light bulb (powered by 220V AC, 60 Hz) through the output voltage of Arduino. I know I must use Triac but the question is, is the output voltage/current of Arduino good enough to control the Triac current such that I can get differen... | Arduino To Control Light Intensity | electronics | 2018-02-06T07:32:13.027 |
[
{
"message": "[NOTE-This is a not a homework problem and i am not asking anyone to solve it]Recently I have been simulating some basic circuit analysis problems in a simulator to get a better feel of the topic.Today i came across this problem----<a href=\"https://i.stack.imgur.com/LJQWw.png\" rel=\"nofollow nor... | Determining the voltage of a network branch | electronics | 2018-02-06T13:22:16.067 |
[
{
"message": "Referring to <a href=\"https://www.silabs.com/community/wireless/bluetooth/knowledge-base.entry.html/2015/08/06/audio_latency_withb-7BGG\" rel=\"nofollow noreferrer\">this, the lowest latencies achieved in Bluetooth audio streaming are around 30-40ms. But given the fact that Bluetooth physical lay... | Why Bluetooth audio works at so high latency? | electronics | 2018-02-06T14:00:06.847 |
[
{
"message": "I am just a hobbyist and I have a typical schematic I've always used to switch on/off relay coils.<a href=\"https://i.stack.imgur.com/9gAT4.png\" rel=\"nofollow noreferrer\">This has always worked the last 3-4 times I've used it (without R1 and C1)But this time, I can't turn the relay on at all (t... | Using BJT NPN to drive relay coil sometimes work sometimes not | electronics | 2018-02-06T18:31:06.080 |
[
{
"message": "Below is a plot of a sweep which shows how Vo changes versus Vi in LTspice:<a href=\"https://i.stack.imgur.com/GL3Yy.png\" rel=\"nofollow noreferrer\">How can I plot the \"derivative of Vo\" i.e dVo/dVi versus Vi?How can I plot the \"integral of Vo\" versus Vi?Edit:I was trying to see how the vol... | How to plot dy/dx versus x of a given y=f(x) plot in LTspice? | electronics | 2018-02-06T18:49:06.220 |
[
{
"message": "I'm developing a buck converter. I need to to change its supply from 9 V to 12 V. I also need to get more power in it (up to 10 A). I do it by reducing the load resistor. Here is my circuit:<a href=\"https://i.stack.imgur.com/lxj0k.png\" rel=\"nofollow noreferrer\">Note: the low-side mosfet does ... | Buck converter stops working with higher power | electronics | 2018-02-07T10:29:36.037 |
[
{
"message": "Hi I am looking to step down a 10 volt DC to 5 DC with low output current (less then 1 amp)Is it the best to build a buck converter or to buy it ready ?thank youActually I am using an arduino, I am not sure if using the 5 volt of the arduino is recommended ?my circuit involve 4 L293D that requires... | build or buy buck converter | electronics | 2018-02-07T16:30:46.227 |
[
{
"message": "I use a regular diode (<code>1N4007</code>) as a flyback diode for a <code>250ma</code> <code>5v</code> fan. My transistor is a <code>2N 3904</code> and the <code>PWM</code> generator is an <code>attiny85</code>:<a href=\"https://i.stack.imgur.com/2wQn5.png\" rel=\"nofollow noreferrer\">I use this... | Do I need a Schottky diode as a flyback diode with PWM @ 30khz? | electronics | 2018-02-07T17:03:25.343 |
[
{
"message": "I'm using an OPA211 in differential mode with unity gain; no external compensation. I'm getting a puzzling ~10MHz bandwidth (specs indicate a bandwidth of 45MHz at G=1) with a peak at 8MHz (consistent with the horrible overshoot/ringing that I see when I feed a square wave input).Here are the deta... | OPA211 weird frequency response --- why? | electronics | 2018-02-07T17:29:27.630 |
[
{
"message": "I have an audio circuit that can record and play audio (saw schematic). I have a DAC and a class D amplifier for playing audio through headphone but i wanted to try to use the same audio jack for record audio from smartphone or PC.Just, i don't know really I can use the same audio jack for output ... | How i can use the same audio jack for input line and headphone output | electronics | 2018-02-07T20:28:25.353 |
[
{
"message": "TL:DR How do I know how to size transistors?This is the same problem as <a href=\"https://electronics.stackexchange.com/questions/349747/wide-swing-cascode-current-mirror-biasing-difficulties\">this one.Now knowing that I can change L, I know that my W/L ratio to make Von = 200 mV is roughly 6.75.... | MOSFET Sizing in Wide-Swing Current Mirror Design Exercise | electronics | 2018-02-07T22:43:29.513 |
[
{
"message": "I'm trying to build my own portable Wi-Fi router that can switch between small internal PCB based antennas (like <a href=\"https://www.aliexpress.com/item/2-4G-5G-dual-band-antenna-with-5dbi-gain-IPEX-dual-band-internal-antenna-signal-booster/32241447988.html\" rel=\"nofollow noreferrer\">this fro... | Circuit to enable switching between antennas | electronics | 2018-02-07T23:35:03.733 |
[
{
"message": "Let us consider a resistive load R is connected across the secondary of transformer whose impedance is r+jX, so in calculation of the power factor of the supply (here in this case it is the secondary of the transformer ), Will the supply power factor be : cos theta = R+r/Z or will it be r/Z only ... | Power factor of a transformer (does it have anything to do with load impedance) | electronics | 2018-02-08T01:53:29.117 |
[
{
"message": "I want to drive <a href=\"https://www.conrad.be/ce/nl/product/508098/TE-Connectivity-RT314F06-Printrelais-6-VDC-16-A-1x-wisselaar-1-stuks\" rel=\"nofollow noreferrer\">this 6v relay (RT314F06) from a 3.3v output gate of an GIO pin of a R-PI3.--edit--There is already <a href=\"https://electronics.s... | Driving a 6V relay from an 3.3v GIO pin of Raspberry PI3 | electronics | 2018-02-08T08:08:12.537 |
[
{
"message": "You can find schematic below. I have seen ripple (apapproximately 184mv) on output of isolation amplifier so I can not read output voltage of amplifier on my ADC.What is the purpose of ripple on output of isolation amplifier? Do you have any advice for it?By the way, I added 1k resistor to schemat... | The reason of ripple on output of isolation amplifier | electronics | 2018-02-08T09:11:22.447 |
[
{
"message": "I am working on a project to build a current and voltage monitoring device (3 phase) using rogowski coils as sensors. It seems that usually CT are used with raspberry or arduino so I would like to have your opinions:using Rogowski coils, what kind of ADC/integrator (or integrating ADC) do I need (... | arduino/raspberry based current and voltage monitoring using Rogowski coil | electronics | 2018-02-08T11:17:14.857 |
[
{
"message": "I am creating a 24V switched source. The GND of the transformer primary must be isolated from the GND of the transformer secondary, I read that a capacitor must be used to isolate the GND's. Does anyone know how I can calculate the capacitance value for this capacitor?<a href=\"https://i.stack.img... | Isolation capacitor | electronics | 2018-02-08T15:57:52.023 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f2olx5.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI have this circuit. The MCU on the right select speaker output if I have a low level and if i w... | How I can get a high level with this circuit? | electronics | 2018-02-08T16:03:52.210 |
[
{
"message": "I have recently started programming an ATtiny85 microcontroller, which as per the <a href=\"http://www.farnell.com/datasheets/1698186.pdf\" rel=\"nofollow noreferrer\">datasheet runs at 10Mhz given 3v3 supply. So, to experiment, I have created a small program, as shown below.<pre><code>#include &l... | Estimating the frequency at which your microcontroller is running | electronics | 2018-02-08T16:29:34.573 |
[
{
"message": "I’m trying to build a Lego Technic panel with some RGB LEDs (do you know they fit perfectly in Technic’s holes?) driven by an Arduino.Anyway, my question is: how do I connect multiple (say, 9) RGB LEDs to be driven simultaneously? I want to use RGB LEDs because, although they all have to show the ... | Connect multiple, non-independent, RGB LEDs | electronics | 2018-02-08T17:16:03.123 |
[
{
"message": "I'm wondering if the below circuit would be a reliable bipolar analog swtich. I'd like to be able to disable signals from certain circuits and I'd rather not have to bias and normalize the signal in order to use a typical analog switch. What issues might arise and how could they be corrected? The... | Using an op amp as a switch for audio (Dual supply +-12V) | electronics | 2018-02-08T17:29:06.757 |
[
{
"message": "I'm wondering if the below circuit would be a reliable bipolar analog swtich. I'd like to be able to disable signals from certain circuits and I'd rather not have to bias and normalize the signal in order to use a typical analog switch. What issues might arise and how could they be corrected? The... | Using an op amp as a switch for audio (Dual supply +-12V) | electronics | 2018-02-08T17:29:06.757 |
[
{
"message": "<a href=\"https://www.digikey.co.za/product-detail/en/pulselarsen-antennas/W3000/553-2577-1-ND/5209283\" rel=\"nofollow noreferrer\">Antenna Guys I am planning on a using the linked antenna on an arduino proto board with 868 data radio and bluetooth chip. I just want to confirm, is it as simple as... | Using multiband monopole antenna? | electronics | 2018-02-08T18:28:29.687 |
[
{
"message": "I'm trying to make an OOK modulated signal in ADS. I need a random bit generator, and a block to multiply a sinusoidal signal with that random pulse. I did this in Cadence by the 'rand_bit_stream' and 'pvcvsp' blocks. Are there any similar blocks in ADS?",
"role": "user"
},
{
"message"... | How to create an OOK signal in ADS | electronics | 2018-02-08T19:05:05.543 |
[
{
"message": "(Modified repost from stackoverflow since it might be more suited to this site)I wanted to try building an arcade stick starting as simple as possible(ICs and basic electronic components as opposed to using an arduino board and the like) and use it on my computer, mostly just for the sake of build... | Getting circuit input on a computer | electronics | 2018-02-09T03:51:56.780 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/V7BL2.png\" rel=\"nofollow noreferrer\">I've been reading more about how oscillators work and one of the more simple ones is the Colpitts oscillator. My understanding is that two capacitors in combination with the inductor can produce oscillations at a given fr... | Colpitts oscillator's capacitors | electronics | 2018-02-09T04:54:25.357 |
[
{
"message": "Background<a href=\"https://www.youtube.com/watch?v=yY3VHfxVnJA\" rel=\"nofollow noreferrer\">This video on using an oscilloscope to view the line-to-line phase voltages of BLDC motors demonstrates the \"virtual\" ground necessary for such measurements. I understand this idea: you need to make a v... | Drive voltage vs phase voltage of a BLDC motor | electronics | 2018-02-09T05:34:08.407 |
[
{
"message": "Hello i am a beginner at this and i would like your guidance . I would like to design an op Amp based 25Mhz Hartley's oscillator . I did some calculations and came up with the oscillator below , but it doesn't oscillate please help me<a href=\"https://i.stack.imgur.com/J3SW8.png\" rel=\"nofollow n... | I would like to design an op Amp based 25Mhz Hartley oscillator | electronics | 2018-02-09T08:40:41.913 |
[
{
"message": "I built simple CE amplifier in Multisim:<a href=\"https://i.stack.imgur.com/1C2ME.png\" rel=\"nofollow noreferrer\">and make AC analysis, the phase are:<a href=\"https://i.stack.imgur.com/3B2Z6.png\" rel=\"nofollow noreferrer\">What is the reverse near 10 kHz? I make the identical circuit in LTSpi... | CE BJT amplifier phase shift | electronics | 2018-02-09T09:40:06.167 |
[
{
"message": "I'm working on a project which consists of repurposed training bike to generate electricity. We have 8 bikes connected in parallel to a battery. The bikes are equiped with AC motors and a diode bridge to convert to DC and produce a tension around 24v.I would like to measure the current produced by... | drawing current from multiple sources in parallel | electronics | 2018-02-09T10:40:37.693 |
[
{
"message": "I am solving objective questions from my book but the main problem is that it doesn't have solutions and in following question I don't know what type of question is this. First I am thinking its Wheatstone bridge related but its not. And resistance are in series but its not. So please tell me what... | How to find equivalent resistance in following question | electronics | 2018-02-09T17:11:06.880 |
[
{
"message": "Is there any rule or limitation for the capacitance in the output of a switching dc to dc step down regulator or PMICs?I mean, could I put the double capacitance in the output to make sure the heavy load responses?",
"role": "user"
},
{
"message": "If output capacitance is too large th... | Switching power supply output capacitor | electronics | 2018-02-09T18:40:40.110 |
[
{
"message": "I'm pretty much a beginner in electronics and I'm currently working on a personal project, where I have a device, that is putting out a digital signal (square wave) that goes from 0V - 2.7V and I need to read that signal with my Arduino. That, unfortunatelly, isn't enough for the Arduino Mega 2560... | Shifting a 2.7V digital signal to Arduino logical levels? | electronics | 2018-02-09T22:38:14.617 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/OshVN.jpg\" rel=\"nofollow noreferrer\">A current is flowing through an ideal capacitor, C = 25μF, the current waveform is a sawtooth. I need to find the formulas that plot the voltage waveform ,which is also shown in the figure,right below the current waveform.... | AC capacitor computational problem using calculus | electronics | 2018-02-10T14:38:35.273 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fiFOL4.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI'm trying to get a phototransistor to saturate a BJT so that when a small amount of light is pr... | Saturating BJT with phototransistor | electronics | 2018-02-10T17:36:02.553 |
[
{
"message": "I am designing a system that can be expressed on an abstract schematic like this:<a href=\"https://i.stack.imgur.com/kY8kb.png\" rel=\"noreferrer\">There is a main MCU that acts as I2C master and some slaves. Some of them are on the same PCB, but some are connected with cables on other PCB's.In ca... | At what point one has to use an I2C buffer? | electronics | 2018-02-10T18:43:36.583 |
[
{
"message": "I have a project where I need to switch the + side coming from the battery (single cell LiPo) to a consumer (ESP8266) with a 3.3V signal (common ground).I have loads of NPN and PNP-transistors here, but can't make it work. I'm sure this is a pretty basic question, but even though I googled the who... | NPN-switching 4V with a 3.3V signal | electronics | 2018-02-11T11:55:16.547 |
[
{
"message": "Background: According to the DEP overview section of this <a href=\"https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20160007774.pdf\" rel=\"nofollow noreferrer\">NASA paper, aviation companies are interested in distributed electric propulsion (DEP) because the scale-agnostic power-to-weight ... | Does the continuous power-to-weight ratio of electric motors decrease with size? | electronics | 2018-02-12T03:06:05.513 |
[
{
"message": "To get further understanding in how iterative simulators work, like circuitJS for an example, I decided to make my own of a simple RC low pass filter.The voltage I am interested in is the one across the capacitor, it can either be calculated with the following formula:\\$V_C=V_{E}(1-e^{-\\frac{t}{... | Iterative simulation of RC low pass filter, strange correction required | electronics | 2018-02-12T03:19:32.153 |
[
{
"message": "I am planning to use a 3v Arduino pro mini with 2 coin cells (3v CR2032 each).I also need to connect 6 flat vibration motors in series rated as follows:-Rated Voltage: 3v,Rated Current: 70mACan I use 2 coin cells (CR2032)?Each Rated:-Nominal Voltage: 3 Volts,Nominal Capacity: 220 mAh,Nominal Disch... | Can I use 3v CR2032 to power multiple vibration motors? | electronics | 2018-02-12T07:02:30.103 |
[
{
"message": "I'd like to connect the audio output of an <a href=\"https://www.sparkfun.com/products/12758\" rel=\"nofollow noreferrer\">Electret Microphone to the audio input of an <a href=\"https://www.microsemi.com/document-portal/doc_view/127041-mt8870d-datasheet-oct2006\" rel=\"nofollow noreferrer\">MT8870... | Connecting Electret Mic to MT8870 Decoder Module | electronics | 2018-02-12T11:47:51.160 |
[
{
"message": "I’m working on a low energy device consisting of a couple of IC’s. What is confusing to me is the following, All ICs has a vcc supply range of 1.7 to 3.6V and most of the time the current reading is given @3.3v supply. Chasing the most efficient design what is actually better running at the bare m... | IC voltages and low power design, What todo? | electronics | 2018-02-12T15:56:19.730 |
[
{
"message": "I am trying to make a touch switch using an Arduino and a MOSFET. I have managed to get an LED to turn on when the pad is touched and it seems to work well (fully on when I touch it and fully off when i don't). However, when I try to replace the LED for an Arduino pin pulled high (internally) I ru... | Arduino MOSFET touch switch | electronics | 2018-02-12T16:41:03.900 |
[
{
"message": "I have a 3phase CDROM BLDC motor for which I don't have any datasheet. How can I find out the number of pole pair in the motor?Hint:-With a magnet, I could check that there are some N and S poles in the rotor inner layer but how can I know the exact number of pole pairs.?<a href=\"https://i.stack.... | Finding number of pole pairs in a BLDC motor | electronics | 2018-02-12T18:16:39.623 |
[
{
"message": "I am using an STM32F407VGT board with an STLINK V2 programmer in keil IDE. I have downloaded to the board a very simple code:<pre><code>#include \"stm32f407xx.h\"#include <stdint.h>int main(void){ RCC_TypeDef *pRCC; GPIO_TypeDef *pGPIO; pRCC = RCC; pGPIO = GPIOA; pRCC->APB2ENR |= (1 ... | keil v5 STM32F4 - Cannot access memory | electronics | 2018-02-13T05:50:51.227 |
[
{
"message": "Is there anyone there that has knowledge if such IC exist? i search in the internet for years like on distributors etc but somehow I can't see any (maybe i don't know the right term or keyword for it to pop-up on search engines). Only 1 decoder i know that has many output combination and that'll b... | Decoder with many output combination | electronics | 2018-02-13T07:32:45.110 |
[
{
"message": "I have a prototype board for Sigfox and LoRaWAN (915MHz) with spaces to install components for a Pi network on the antenna.We're using a 0R 0603 SMD resistor in place of the inductor, and no capacitors at the moment. I.e. we have bypassed the Pi network.I was wondering, is a standard 0603 0R resis... | 0R resistor performance in RF Pi Network | electronics | 2018-02-13T07:39:48.700 |
[
{
"message": "for a project I'm using a electromagnet (currently this: <a href=\"https://www.ebay.co.uk/itm/152311638782\" rel=\"nofollow noreferrer\">https://www.ebay.co.uk/itm/152311638782) to dynamically pull an object based on the value coming from a potentiometer.In a nutshell: the potentiometer's value is... | Electromagnet creates loud noises when changing voltage | electronics | 2018-02-13T09:54:21.287 |
[
{
"message": "I got really surprised by seeing this possibilities from a power, energy calibrator is it really injecting it by violating the laws what we use in practice? See the photos? If anyone knows it please explain it for me.Current with zero potential difference?<a href=\"https://i.stack.imgur.com/AIuJA.... | Is it possible voltage without current and opposite | electronics | 2018-02-13T12:15:13.813 |
[
{
"message": "I was given a task to generate a sine wave by using TLC2274ACN. The circuit is as follows. But at the output i'm getting a DC voltage when I measured it in Oscilloscope. I believe that the circuit is pretty much correct as I have gone though several websites but in those websites the opamps are di... | What's wrong with my sine wave generator? | electronics | 2018-02-13T12:33:56.333 |
[
{
"message": "Ok guys, look at this picture:<a href=\"https://i.stack.imgur.com/pHZuq.png\" rel=\"nofollow noreferrer\">How is possible that with the same \\$I_{\\rm base}\\$ we have more than one \\$V_{\\rm ce}\\$?",
"role": "user"
},
{
"message": "Consider the two transistors below.<a href=\"/plug... | How is possible that with same Ibase there is more than one Vce? | electronics | 2018-02-13T13:43:55.670 |
[
{
"message": "I have a few questions regarding my understanding of circuits.When you hook a battery up to a conductor does the chemical reactions which take place create a difference in charge between the terminals?If so, is it the electric field created by this difference which exerts a force on charge placed ... | Circuit understanding | electronics | 2018-02-13T17:07:22.267 |
[
{
"message": "I have a linear resonant actuator like this one: <a href=\"https://www.gearbest.com/other-accessories/pp_670798.html\" rel=\"nofollow noreferrer\">https://www.gearbest.com/other-accessories/pp_670798.html I need to control its frequency of vibration and for that I intend to use a potentiometer and... | Vibration frequency measurement with a piezo sensor | electronics | 2018-02-13T20:19:17.557 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/SVQtI.png\" rel=\"nofollow noreferrer\">The above signal is fed to the following circuit - <a href=\"https://i.stack.imgur.com/myCN5.png\" rel=\"nofollow noreferrer\">It is given that RC>>T and diode is ideal.Doubt - As RC>>T, the capacitor will not be able to c... | What will be the output of the following circuit? | electronics | 2018-02-14T08:22:14.733 |
[
{
"message": "I have been set the task of creating an h-bridge that can control a 12V DC Drill motor. Below is a slightly modified version of the document I have been given to help me get started:<a href=\"https://i.stack.imgur.com/yjC1Z.png\" rel=\"nofollow noreferrer\">I don't understand why only one of the M... | H-Bridge design understanding | electronics | 2018-02-14T10:35:38.463 |
[
{
"message": "I have been set the task of creating an h-bridge that can control a 12V DC Drill motor. Below is a slightly modified version of the document I have been given to help me get started:<a href=\"https://i.stack.imgur.com/yjC1Z.png\" rel=\"nofollow noreferrer\">I don't understand why only one of the M... | H-Bridge design understanding | electronics | 2018-02-14T10:35:38.463 |
[
{
"message": "I'm looking to supply an MCU (3.3 V) from battery via voltage regulator: a pushbutton should enable the supply, the MCU then should keep the supply enabled until it wants to shut itself down. But the pushbutton should be dual-purpose, i.e. it should also work as a normal button readable by the MCU... | Latching control via active-high battery supply / regulator shutdown pin? | electronics | 2018-02-14T14:33:50.507 |
[
{
"message": "I am currently doing a project where I need the Real power (P) and Reactive power(Q) measurement for a Refrigerator. I understand that if I can measure AC Voltage(V) and AC Current(A) for the Refrigerator, then I can calculate the Power Factor. From that then I can calculate both P and Q. I want t... | Tool for measuring Real and Reactive Power | electronics | 2018-02-14T15:53:27.367 |
[
{
"message": "For data recovery I need to desolder a BGA 153 eMMC chip from a dead phone. I'd like to maximize my chances of NOT destroying the eMMC chip in the process (the other remains of the phone do not matter since these are dead already). I've already watched various instruction videos and I'd say I have... | How to desolder a BGA 153 eMMC chip | electronics | 2018-02-14T16:39:29.080 |
[
{
"message": "I have a very cost effective MCU that only contains one UART which can only be mapped to one set of pins. I am not willing to change the MCU choice. I also do not need to use the Rx on that MCU. I was hoping to use the UART and a GPIO to send that Tx signal to multiple devices. This is a single in... | Routing one UART Tx output to multiple UART Rx using MOSFET | electronics | 2018-02-14T17:02:00.690 |
[
{
"message": "I have a 120VAC, 0.01 amp motorized ball valve that I need to plug into a control box. A pcb inside the box turns the valve on and off. The valve is shipped with an attached 2-wire cable that ends in bare leads. The system is designed to handle multiple 120VAC components inside the box, so I can't... | 120VAC Cable Connector Type | electronics | 2018-02-14T17:18:07.513 |
[
{
"message": "A single ended earth grounded data-acquisition board has several inputs. Since it is single ended all input channels share the same ground when hooked up.The thing is normally if there is no ground loop in the entire system and if I lets say plug in a new channel the other(already connected channe... | A question about white noise in a single ended data acquisition system | electronics | 2018-02-14T18:13:52.623 |
[
{
"message": "I have two signal lines that I will be monitoring with an MCU Input I/O pin (3.3v powered). Both inputs will be coming from external sources. I will be monitoring each of them for a high or low state. The problem is that the signal coming in could be between 0v and 24v, and the signals coming in \... | Input Protection | electronics | 2018-02-14T18:40:29.977 |
[
{
"message": "NAND-based digital flash data storage devices such as SD,SSD,USBstick,eMMC,UFS,etc. do have transistors, where the small amount of electrical charge does slowly leak over time, resulting into data loss when inactive for excessive time spans. Heat does accelerate that process.In order to recharge t... | NAND flash retention using USB charger? | electronics | 2018-02-14T21:13:14.273 |
[
{
"message": "I am a beginner of electronics and mostly fascinated by hobby circuits right now. I do not have any Electronics Degree. Internet and hobby Electronics books are the only places where I learned lill-bit of Electronics. One of the most popular circuits being shared by Experts on internet and in thos... | FM Transmitter Power and approx Transmission Distance Calculation | electronics | 2018-02-14T22:51:18.280 |
[
{
"message": "I am trying to connect many (~80) ToF distance sensors VL53L0X onto a single i2c bus. They have the default i2c address 0x52, which is programmable, but not persistent. Thus I have a choice between selective turn on/off of sensors (via GPIO expansion on i2c etc) and reprogram each individual addre... | Cascaded i2c address translators? | electronics | 2018-02-15T00:09:57.000 |
[
{
"message": "I have a 0-5 volt variable frequency sine wave signal source I am trying to convert to +/-2V.I would like to preserve the frequencies 20Hz-20KHz.I have a +5 and -5 volt signals I would like to use as power supplies.How can I level shift this signal down 2.5 volts so that it is centered at 0, and a... | How can I convert 0-5V to +/-2V using a dual supply op amp? | electronics | 2018-02-15T02:03:00.213 |
[
{
"message": "I have a 0-5 volt variable frequency sine wave signal source I am trying to convert to +/-2V.I would like to preserve the frequencies 20Hz-20KHz.I have a +5 and -5 volt signals I would like to use as power supplies.How can I level shift this signal down 2.5 volts so that it is centered at 0, and a... | How can I convert 0-5V to +/-2V using a dual supply op amp? | electronics | 2018-02-15T02:03:00.213 |
[
{
"message": "Any references on how to go about modelling an AC/DC mains isolated H bridge buck converter in s or z domain? All the current resources online point to modelling buck converter with a single switch and in non isolated configuration.The current process that I use for compensator design is that I lo... | Isolated buck H bridge control system design | electronics | 2018-02-15T05:05:55.780 |
[
{
"message": "I see on the internet showing CPW( coplanar waveguide) always placed on TOP layer with ground underneath. This is what I usually do.Is it possible to place a CPW in an internal layer? if so what should I take in consideration? On top layer I have components and various signals. Unfortunately I can... | Antenna CPW internal layer | electronics | 2018-02-15T10:13:25.023 |
[
{
"message": "We have an application which accepts streams over IP and displays it on the LCD Screen.We want to test the Ethernet plug-in/Plug-out test. Do you know any IC which can simulate someone plugging in and unplugging the Ethernet cable. I need something that is a high speed Ethernet mechanical switch. ... | Ethernet mechanical switch for testing | electronics | 2018-02-15T11:01:51.197 |
[
{
"message": "We have designed a board to control asynchronous single phase motor, using two half-bridge gate –drive IC (Fairchild FAN73833MX) and four IGBT (Fairchild FGH30T65UPDT) as shown in the scheme below.Using a MCU we have implemented a 18kHz PWM control signal with a 1,5us dead-time, but we noticed tha... | Half-bridge gate–drive IC issue | electronics | 2018-02-15T11:19:55.097 |
[
{
"message": "In a battery are electrons generated at the negative electrode due to chemical reactions and do they flow to the positive electrode due to a difference in electronegativity of the electrodes? Is an electric field generated as a result?I always thought it was due to a difference in charge between t... | is it electronegativity or a difference in charge which produces current | electronics | 2018-02-15T11:38:34.010 |
[
{
"message": "I'm building a series of gadgets for my kids that mostly (microchip, sensors) run off 3.3 but there are some switches and possible servos that run off 12v. My original idea was just to have two wires, one for 12v and one for 3.3v but I don't like that since most of the items won't need the 12v and... | Should I step-up or step-down the voltage if I have the option? | electronics | 2018-02-15T12:15:39.807 |
[
{
"message": "I have designed an SR latch using Cd4001 NOR gate IC. When both S and R are low the circuit refuses to stay in previous state even though I am using appropriate dropping resistors. Is there any way to avoid this with same CD4001 circuit configuration.This is the circuit configuration i am using:<a... | How do I avoid a race condition in SR latch? | electronics | 2018-02-15T13:41:43.910 |
[
{
"message": "I wont say I am great at reading datasheets, but I noticed that for 74LS06 chip, Ioh is 0.25 mA and Iol is 40mA. Does that mean it can light-up an LED when its output is low but not when its output is HIGH (a forward biased LED of course)?If yes, does it mean that all those chips whose Ioh or Iol ... | Why my hex inverter chips (all three of them) are not producing a HIGH output with low input? | electronics | 2018-02-15T16:51:14.333 |
[
{
"message": "I am in the middle of trying to wrap my head around basic electronics. I understand the concepts of voltage, amperage, and resistance, however I'm confused about how heat is generated and related to these three things. These are my assumptions and questions:When you plug an appliance into a 120 V ... | Heat and small appliances | electronics | 2018-02-15T19:18:00.463 |
[
{
"message": "NOTE: Question was edited following comments and answers.As you would probably all agree, current is in practice measured by putting a resistor of small resistance in series and then measure voltage across that resistor. (I know there are other scientific methods, but are they used in everyday hob... | High precision DC current measurement | electronics | 2018-02-16T10:24:49.300 |
[
{
"message": "I want to use the ultrasonic sensor under a metal grid plate like below (just 1 of those plates instead of 3). The sender/receiver will be under (partly inside) two adjecent holes (hopefully it fits) and point upwards. The reason is to detect if someone (a person) steps on the plate.The height of ... | HC-SR04 Ultrasonic sensor below a grid plate | electronics | 2018-02-16T11:30:07.557 |
[
{
"message": "I am trying to generate 500 kHz sine wave of varying amplitude using full bridge transformer isolated DC/AC converter.I decided to use a sine wave table to change the PWM duty cycle. More the values per cycle better the sine wave output. For 256 values per half sine wave, we need to update once ev... | Generating 500 kHz sine wave using modified PWM | electronics | 2018-02-16T13:45:33.760 |
[
{
"message": "In my apartement I have the problem that when I am in my bedroom I can hear the neighbours in their bedroom exactly above me talking. Luckily I can not hear what they are saying but still pretty annoying.First I thought that the sound travels directly trough my roof, but now I am not so sure since... | How do I build a system for localizing sound source? | electronics | 2018-02-16T14:14:05.587 |
[
{
"message": "I would like to know what 'strobe' pin does for HV5812 shift register, because I do see it in the time graph<a href=\"https://i.stack.imgur.com/5AWLj.png\" rel=\"nofollow noreferrer\">But the datasheet does not elaborate on its function, it only says 'strobe'<a href=\"https://i.stack.imgur.com/MCP... | What does "strobe" do for this shift register? | electronics | 2018-02-16T18:35:43.903 |
[
{
"message": "Is it possible to measure the magnetizing and leakage inductances of an air-core transformer (coupled coils with no ferrite core) normally using LCR meter? I want to get the values of magnetizing inductance and leakage inductances of the air-core coupled coil that I would be making for different v... | Air-core transformer measurement using LCR meter | electronics | 2018-02-17T04:36:22.773 |
[
{
"message": "So I have \"built\" a voltage sensor for an Arduino by using two resistors. The current setup is as shown in the schismatic and the Arduino pins are only 5V tolerant.<a href=\"https://i.stack.imgur.com/UAUWz.png\" rel=\"nofollow noreferrer\">The accuracy of the sensor is alright when there is litt... | Smoothing Capacitor for Voltage Sensor | electronics | 2018-02-17T06:51:40.413 |
[
{
"message": "Correct me if I am wrong but so far, I've learnt that some ICs can source current while some can only sink (open-collector) while others can do both. And it is decided by looking at the datasheet, Ioh and Iol readings, which should be in mA values to glow an LED. But I sense I'm wrong since an LED... | What decides that an IC will be able to sink or source current? | electronics | 2018-02-17T10:47:14.790 |
[
{
"message": "If a MOSFET gate driver is supplied by a 12V DC power supply and if it is drawing a current I(t) from the power supply, what can we say about the power consumption in terms of voltage and current?<a href=\"https://i.stack.imgur.com/3oBmd.png\" rel=\"nofollow noreferrer\">I was thinking the power c... | Which one is correct for this power consumption estimation? | electronics | 2018-02-17T20:09:21.097 |
[
{
"message": "I want to measure the frequency of a signal using the digital input pins of the NUCLEO-F767ZI. The signal is sinusoidal with an amplitude of 5 V and a frequency ranging from 100 kHz to around 400 kHz.1.) First I thought about simply feeding the pure analog signal to the input pin that is 5 V toler... | Zero Crossing Detection of ~ 400 kHz Signal with MCU | electronics | 2018-02-17T20:41:46.153 |
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