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": "Textbook formula for field intensity in solenoid coil is<pre><code>H = (N * I) / l</code></pre>H magnetic field intensity in ampere-turnsNI ampere-turnsl is length between the coil poles (along the axis of the field flux)This formula does not take into consideration the width (or diameter) of the ... | Solenoid's field intensity calculation dependency on width/diameter of coil? | electronics | 2018-04-08T20:20:40.130 |
[
{
"message": "In BJT small-signal models there is both re and rπ parameters. They both represent the dynamic resistor between the base and the emitter terminals.But I read that they are different by a factor of β as:<blockquote> rπ = β × re</blockquote>I know the concept of transconductance gm. It is the slope... | Confusion about the meaning of re and rπ | electronics | 2018-04-09T01:17:38.200 |
[
{
"message": "Currently I have this UPS power setup for my Router with the help of a DPDT relay so that the router works when mains power supply fails. The working principle of my project is real simple. Two separate power supplies are connected to a DPDT relay where one the power supply powers the relay coil a... | Replace DPDT relay with Mosfet? | electronics | 2018-04-09T06:03:25.027 |
[
{
"message": "While reading some experimental setup of a paper, I've came across with a statement saying,\"Since a DC power supply is not capable of finely regulating the discharge current at very low currents( in the mA range), a separate current-limiting low-inductance resistor was added to enable the stable ... | Role of "a current-limiting low-inductance resistor"? | electronics | 2018-04-09T13:03:21.823 |
[
{
"message": "Hi have a 3 phase DC rectifier: input 400V AC; output up to 10V/2000A DCI'm aware that it's normal to have some AC current in the output of the rectifier and in this particular case it is acceptable up to 5% Ripple.However something odd is happening. Once the rectifier is ON without any load, i'm ... | ac current measured in a 3 phase dc rectifier | electronics | 2018-04-09T13:18:15.197 |
[
{
"message": "Today in our signals and systems lecture we were going through a particular problem then our professor took a signal and broke into its constituent parts he drew this diagram------<a href=\"https://electronics.stackexchange.com/questions/367436/composition-of-a-signal\">Horribly out of scale and s... | Composition of a signal | electronics | 2018-04-09T15:07:27.653 |
[
{
"message": "This is regarding an integrator op amp design, the rate at which the input voltage charges the integrator's feedback capacitor is 150V/s. I am trying to justify the minimum feedback capacitor value before the bias current (or whatever else) affects the minimum current too much! This is my understa... | The effects of Op amp Bias current | electronics | 2018-04-09T16:48:34.217 |
[
{
"message": "I have a question with regards to how data is sent using single-wire cables between devices which are otherwise electrically isolated? edit: I understand now Coaxial has a common ground, but my question still stands: how is data transmitted without a common ground?",
"role": "user"
},
{
... | Cable based data transmission without common ground | electronics | 2018-04-09T18:03:53.463 |
[
{
"message": "I understand that there was one other question regarding avalanche photodiodes, however I am looking more for connecting my APD to a microcontroller (Arduino). <a href=\"https://www.edmundoptics.com/testing-detection/detectors/avalanche-photodiodes/\" rel=\"nofollow noreferrer\">https://www.edmund... | How do I connect an avalanche photodiode to an Arduino Uno? | electronics | 2018-04-10T00:48:18.967 |
[
{
"message": "For a small 24V 1A transformer where should I place the fuse? Secondary 1A fuse or primary 100mA fuse (or above accounting for inrush current)? Mains is 230V. Also, the smallest fuse available in the market seems to be 200mA.Also, how about a 30V 6A transformer? I guess for a 12V 500mA transformer... | Small step down transformer fuse, primary or secondary? | electronics | 2018-04-10T10:42:47.303 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/jzRA2.jpg\" rel=\"nofollow noreferrer\">I was inspecting a PCB with a magnifying glass and noticed some of the light brown ceramic smd capacitors have 3 digit markings on them. Is there a \"standard\" of what these markings stand for? The first digit looks like ... | Meaning of Ceramic Capacitor markings | electronics | 2018-04-10T13:42:51.137 |
[
{
"message": "Good day guys. This is my first time posting, hope you can help me a bit with this.My Sony Vaio laptop from 2009 has two damaged AO4433 MOSFETS near the power supply connector. I want to replace them, but I can't find this exact model in my city. I have an old laptop motherboard (for spare parts) ... | Replace MOSFET AO4433 With FDS6679 | electronics | 2018-04-10T15:10:06.317 |
[
{
"message": "I have designed a 50 Ohm microstrip line. Following is an image of it.<a href=\"https://i.stack.imgur.com/kUI6o.png\" rel=\"nofollow noreferrer\">This is drawn in Eagle. Two layer PCB. Blue plane is the ground plane. The dimensions are:Width: 1250 micrometersThickness: 1 ozHeight (between ground p... | Narrowing a microstrip's tip | electronics | 2018-04-10T20:22:47.787 |
[
{
"message": "I was wondering how do SDRs adjust their passband for a such a wide range of frequencies?The normal RF chain is, passband RF filter -> Mixer -> IF or basebandSome SDRs can select their passband from being centered at 100khz to being centered at 3Ghz(with their IF or baseband range 20Mhz).Does the ... | How are the passband filters in SDRs able to select such a wide range of frequencies? | electronics | 2018-04-11T02:21:44.850 |
[
{
"message": "Here is a short Anecdote, which will give a good explanation into my question. I was in a Science class, and we were doing a circuit with a very small Filament Light Bulb, and some AAA Batteries. I connected around 2 AAA Batteries in parallel, as opposed to Series, and I was promptly chastised, as... | Why don't electrons in Parralel battery circuits repel? | electronics | 2018-04-11T13:34:42.893 |
[
{
"message": "I am trying to detect line voltage (230V AC, if the supply is ON/OFF) by a microcontroller with the help of an AC optocoupler. The optocouplers I have evaluated are PC814, H11AA1 and SFH620A-3, out of which I found SFH620A-3 to be more efficient (must be due to the better CTR). I had connected a s... | AC Optocoupler for 230V line detection | electronics | 2018-04-11T19:05:11.763 |
[
{
"message": "I would like to replace a battery pack with a power supply. I have several Force Fx light savers. These are powered by 6 AA batteries concealed in the hilt.I want to create a small power supply that will be enclosed in a wall mount for the light sabre, when the sober is on the wall mount the ide... | Mains supply to replace 6 AA batteries | electronics | 2018-04-11T19:54:45.737 |
[
{
"message": "I try to simulate the input stage of the ADC feeding circuit. ADC is 0-3.3V.The circuit:<a href=\"https://i.stack.imgur.com/buNIW.png\" rel=\"nofollow noreferrer\">The Vin input signal:<a href=\"https://i.stack.imgur.com/lyLB1.png\" rel=\"nofollow noreferrer\">The output:<a href=\"https://i.stack.... | How to calculate the feedack resistor in this configuration | electronics | 2018-04-11T21:45:19.733 |
[
{
"message": "In one of my laboratory assignments, I am to study how to work with square signals in RC circuits (low pass filter). Please keep in mind this is an introductory Electronics course. Basically, I am thinking of using a 1k\\$\\Omega\\$ resistot and a 6.8 nF capacitor. My square signal has an amplitud... | How to set up signal generator in lab to obtain an output voltage? | electronics | 2018-04-11T22:27:57.417 |
[
{
"message": "Ah, it is really a beauty isn't it (see picture below)? Around the package you see some spring contacts, really, really nice. I have some ESP8266MOD modules and like to use these spring contacts before soldering anything on the pins. <a href=\"https://i.stack.imgur.com/w9LP9.jpg\" rel=\"nofollow n... | What's the name of this nice spring contact? | electronics | 2018-04-11T22:37:29.230 |
[
{
"message": "I have a few old laptops with good LCD panels that I wish to salvage and use as external VGA screen on other computers.I'am no expert in electronics but I work with computers and know the basics of it. I also did a lot of research on the subject and did my best with no success. I invested some mon... | Using old laptop LCD as external VGA screen | electronics | 2018-04-12T00:59:30.253 |
[
{
"message": "Between a mains step down transformer and a SMPS, which would be safer for a bench power supply? I cannot look inside the transformer in either case to judge the insulation quality. But, if the insulation does fail there would be 230VAC at the secondary for the mains transformer. And, maybe 325VDC... | Safety: Mains step down transformer vs SMPS for bench power supply? | electronics | 2018-04-12T11:11:48.810 |
[
{
"message": "I'm doing low side current measurement over a 0.1ohm resistance. Load is a DC motor powered with 12V. <a href=\"https://i.stack.imgur.com/DSSBD.jpg\" rel=\"nofollow noreferrer\">Cable length between resitor and power supply ground ~60cmI get a voltage of :75mV => 750mA using power supply current i... | DC current consumption with sense resistor, different measure on oscilloscope and multimeter | electronics | 2018-04-12T13:48:45.177 |
[
{
"message": "There is a 1st order low-pass filter with a transfer function known as:H(s) = 1 / (1 + s×1/ωc)where ωc is the cut-off frequency.I want to see the output vs input for this filter in time domain.In this case, I can find the output if I knew the input x(t) and its Laplace transform X(s) and then I co... | How can the response/output of a given filter to a given sampled data be obtained in this case? | electronics | 2018-04-12T14:43:42.600 |
[
{
"message": "I am planning to wire a 4U DIY JBOD top loader.Looking at the power output of several power supplies they have a a maximum rated 5v rail of 100-125w. By looking at the spec sheet of my chosen HDD I'll require more than double for all drives. There is plenty of current available on the 12v rail and... | Powering 64 SATA HDD from Single ATX Power Supply | electronics | 2018-04-12T15:38:38.573 |
[
{
"message": "As part of a project, I'd like to test the correct operation of a set of SPST switch ICs (maybe 8 or 16 or so). Each device contains six independent switches, and they are controlled through an SPI bus. I plan to operate the switches at around 10 or 20 kHz. I'm thinking of using an inexpensive mic... | Looking for multi-channel event counter IC to verify switch operation | electronics | 2018-04-12T15:55:16.680 |
[
{
"message": "I'm switching on an LED strip power supply using an Arduino, but my relay has just started sticking. The relay switches the mains for a <a href=\"https://www.amazon.co.uk/gp/product/B01LZF6NK6/ref=?ie=UTF8&m=A1RN00SEA8MFZD\" rel=\"nofollow noreferrer\">5V 20A power supply. The relay board is <... | Relay sticking when switching mains for LED power supply | electronics | 2018-04-12T19:29:37.647 |
[
{
"message": "I'm planning on building a circuit that can \"phase control\" the AC signal to lower the power supplied to my hot water element. The goal is to lower the power in line with my PV generated in near real time. <a href=\"https://i.stack.imgur.com/tAERH.jpg\" rel=\"nofollow noreferrer\">The element is... | Suggestions to upgrade this PWM AC circuit to handle 3000w | electronics | 2018-04-13T00:00:55.167 |
[
{
"message": "Is there have any simulation software which is indicating other than current signals like heating, burning and so on with time by Power. Circuit simulating like real world behaviors of circuit. Component Heating or buringWire or Track Heating or burringHave this feature in Proteus or Multisim soft... | Indicate Heating, Burning and so on in Circuit Simulation Software | electronics | 2018-04-13T07:18:37.877 |
[
{
"message": "I am building a custom speaker to play music on from my phone and obviously need to run an amplifier between the speaker itself and my phone. I'm wondering if anyone knows how many watts a phone plugged directly into an unaplified speaker puts out so I can use this as a baseline for my build. Than... | How many watts does your phone put out | electronics | 2018-04-13T09:23:45.520 |
[
{
"message": "I have an LED driver that ins't working. i have tried to search for the actual part, and been over to RS to find what I need. <a href=\"https://i.stack.imgur.com/aVf2h.jpg\" rel=\"nofollow noreferrer\">There are two possibilities on RS - but I am not sure if I need the constant current or the cons... | Led driver - constant current or constant voltage | electronics | 2018-04-13T14:23:27.680 |
[
{
"message": "I have my circuit configured this way because I'll be hooking up my 8051 microcontroller GPIO pin to the point where three resistors (R2, R3, and R4) intersect, and the microcontroller only outputs my choice of high-impedance and ground, never VCC. The 500K was included in this circuit because I w... | Maximum resistor values for transistor inverter (NOT gate) | electronics | 2018-04-13T22:29:35.757 |
[
{
"message": "I have a case that I need to build a pulser switching for my ultrasonic transducer which operate in 180 V and 1 MHz. I use mosfet IRF250 for the switching, and below is the circuit:<a href=\"https://i.stack.imgur.com/mwQ8o.jpg\" rel=\"nofollow noreferrer\">This is pretty good with response like th... | How to make falling time shorter for mosfet switching for high voltage and high frequency ultrasonic pulser | electronics | 2018-04-14T05:09:02.860 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/EcC3P.png\" rel=\"nofollow noreferrer\">I am a beginner at electronics and I am trying to solve my first problems with diodes and opamps. I have to find and draw the output voltage uο related to the input voltage ui knowing that the voltage drop on the diodes is... | Op-amps circuit with diodes | electronics | 2018-04-14T13:57:41.903 |
[
{
"message": "I'm a noob just getting my feet wet in EE, so go easy on me, please. I bought an Arduino Uno and have been learning tons in the last couple weeks. I took an LM35 sensor, a generic thermistor (using a 10kohm resistor), a light-dependent resistor (photoresistor?) (using a 10k resistor), a button (... | Arduino sensor data erratic | electronics | 2018-04-14T20:00:27.933 |
[
{
"message": "I'm a noob just getting my feet wet in EE, so go easy on me, please. I bought an Arduino Uno and have been learning tons in the last couple weeks. I took an LM35 sensor, a generic thermistor (using a 10kohm resistor), a light-dependent resistor (photoresistor?) (using a 10k resistor), a button (... | Arduino sensor data erratic | electronics | 2018-04-14T20:00:27.933 |
[
{
"message": "Below you can see the basic CMOS inverter. What I don't understand about this particular design is the purpose of the n-channel mosfet which is the part referred as pull-down network. What if we didn't put a NMOS in there? In low input voltages, we would have Vdd as expected but we would have grou... | What is the use of pull-down networks in CMOS gates? | electronics | 2018-04-14T22:01:07.870 |
[
{
"message": "I'm trying to build a 1A LED buck <a href=\"https://i.stack.imgur.com/eYEWY.jpg\" rel=\"nofollow noreferrer\">It works well, current in leds depends of pwm duty until 1A and more, but when I watch signals with an oscilloscope, there are noise or oscillations on Rsense.See a screen shot of signals ... | LED buck driver | electronics | 2018-04-15T13:02:31.463 |
[
{
"message": "I am a newbie in electronic and i would like to ask why there is Transmitter and Receiver in the RJ45 cable connecting the MODEM and Computer? Which one goes firstFrom Modem --> Receiver Receive signal ---> Transmit to the PC? ORFrom PC computer --> Transmit signal to Modem to fetch signal ---> Th... | How does things work between MODEM and PC on the RJ45 ethernet cable? | electronics | 2018-04-15T13:47:37.467 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fSu9qM.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI have a Runcam 2 video camera. It uses a temporary switch to turn on/off and start/stop record... | Using a transistor to control a pull-down switch | electronics | 2018-04-15T15:54:49.157 |
[
{
"message": "I am trying to make a calculator that can do fixed point calculations but I don't know how to display them in decimal (BCD). People have told me to use reverse double dabble but I am looking for another solution. How can I convert fixed point binary numbers to BCD without using reverse double dabb... | How to convert fixed point binary numbers to BCD? | electronics | 2018-04-15T17:28:20.257 |
[
{
"message": "I'm new to circuits in general but have a basic understanding of it. However, it seems I can't wrap my head around the following issue:(I'm using Tinkercad Circuits for trying out different approaches. All values come from the software's \"multimeter\".)I have a very simple circuit, consisting of ... | How to make the output of a transistor the same as the input? | electronics | 2018-04-15T17:45:21.457 |
[
{
"message": "I'm new to circuits in general but have a basic understanding of it. However, it seems I can't wrap my head around the following issue:(I'm using Tinkercad Circuits for trying out different approaches. All values come from the software's \"multimeter\".)I have a very simple circuit, consisting of ... | How to make the output of a transistor the same as the input? | electronics | 2018-04-15T17:45:21.457 |
[
{
"message": "I am writing a code in vhdl for image processing and I learned that in order to blur a picture, that picture must be lowpass filtered. I know about lowpass filters but I dont know how to apply this idea to the image I am trying to blur. How can I do blur a picture in vhdl using this idea?",
"r... | lowpass filtering in vhdl | electronics | 2018-04-16T11:00:12.473 |
[
{
"message": "I have a 10 seconds of sampled data. Sampling rate is 1kHz. I uploaded the text file which is a two column time vs voltage data; it can be downloaded <a href=\"https://uploadfiles.io/kfete\" rel=\"nofollow noreferrer\">here. I performed FFT in MATLAB, Python and LTspice. MATLAB and Python agrees w... | Getting different FFT results in LTspice comparing to MATLAB and Python | electronics | 2018-04-16T16:41:36.587 |
[
{
"message": "I am using an isolated DC/DC converter to supply a MOSFET's gate drive, in a high frequency and high voltage application, so I am concerned about the EMI in my design.In the website of the manufacturer, I could find this document that has a suggestion of external EMI filter (page 3 and shown below... | Understanding topology for EMI supression in a power supply | electronics | 2018-04-17T03:08:18.517 |
[
{
"message": "I have an objective to make a pulser for ultrasonic 1Mhz and 120V, for step up DC i used a boost converter with switching frequency 10KHz, 0.9 Duty Cycle and 12V supply, the boost converter work perfectly for static load like 1Mohm, but when i attach the converter for supplying my switching ultras... | Effect of switching frequency in boost regulator with switching load | electronics | 2018-04-17T03:53:57.873 |
[
{
"message": "I have an objective to make a pulser for ultrasonic 1Mhz and 120V, for step up DC i used a boost converter with switching frequency 10KHz, 0.9 Duty Cycle and 12V supply, the boost converter work perfectly for static load like 1Mohm, but when i attach the converter for supplying my switching ultras... | Effect of switching frequency in boost regulator with switching load | electronics | 2018-04-17T03:53:57.873 |
[
{
"message": "What are the parameters to be taken care to RF Antenna designs and RF circuits designs? What are the design criteria for RF designs?",
"role": "user"
},
{
"message": "Your question is very broad and would likely be better served by a google search for relevant App Notes. The main idea ... | RF Antenna design guidelines, PCB design Antenna | electronics | 2018-04-17T05:08:50.973 |
[
{
"message": "We have an RLC series circuit with sinusoidal voltage source of frequency \\$\\omega\\$. The normal transfer function of current to voltage is:$$ G(s) = \\frac{I(s)}{V(s)} = \\frac{1}{R+s L+ \\frac{1}{s C}}$$We would like to find out the transfer function for phase shift of current to the capacita... | Transfer function of phase change controlled with capacitance | electronics | 2018-04-17T09:05:46.383 |
[
{
"message": "I am trying to teach myself electronics, namely audio filtering, and I came across this circuit. Now with my limited knowledge the 'volume potentiometer' (that's what it is explained as) seems to be in parallel with the resistor forming the high-pass RC filter so would this mean that this circuit ... | RC Filter Parallel Potentiometer | electronics | 2018-04-17T10:12:29.270 |
[
{
"message": "I want to build a bathroom mirror frame with integrated LED spot lights. Current comes out of the wall, there are already two on/off switches which control that single outlet. That is why I „believe“ I cannot simply replace (one of) the switches with a turn knob dimmer.The frame is only 2cm thick ... | LED dimmer between current supply and drivers | electronics | 2018-04-17T10:16:09.603 |
[
{
"message": "For a half km digital transmission I want to use RS485 protocol. I want to sample an analog voltage by an uC like arduino and send this data digitally for half km to a receiver. I want to poll/retrieve the data by sending a character to the uC via the RS485 protocol. So for instance if I send char... | A question about digital transmission from a microcontroller | electronics | 2018-04-17T10:35:30.267 |
[
{
"message": "please help:I have a string of 14 AGM batteries in series, when discharged at constant current, the voltage has a stair-like shape with respect to time.What does this mean?The batteries are new but were stored for more than a year without charging. They were cycled again and the stairs \"softened\... | Stair like discharge voltage profile in AGM battery | electronics | 2018-04-17T23:22:59.687 |
[
{
"message": "INTRODUCTION: I'm aiming to design an Ethernet connected system as a hobby ( ie. plenty of time but not wishing to spend much ). My design constraints would be sticking to a 2 layer 100 mm x 100 mm PCB with 0.3 mm min holes and 0.15 mm min track/clearance/annular ring and 1.53 mm thick dielectric ... | 100 Ohm diferential impedance microstrip PCB traces geometries in two layer board | electronics | 2018-04-17T23:51:41.147 |
[
{
"message": "I have a processor which accepts MIPI data. However, the problem is I want to perform some processing on this data and the IMX6 is not fast enough to do this in real time. I was wondering what is the best way to have the FPGA operate on the raw pixels in my image.One of the options was getting the... | Inserting an FPGA on a MIPI camera lane | electronics | 2018-04-18T14:26:27.017 |
[
{
"message": "Inductors come in many types e.g. cylindrical (single and multi layer), spiral (single layer and stacked), toroidal (single and multi layer), and probably others.For an air core inductor, assuming the same wire pitch and including the volume enclosed by the coils, is there a particular shape/layer... | Is there an inductor type that has the best inductance per unit volume? | electronics | 2018-04-18T21:26:37.983 |
[
{
"message": "I am a bit electronically challenged and need to hold an input pin high for about 8-10 seconds. I am implementing this solution: <a href=\"https://github.com/NeonHorizon/lipopi/blob/master/README.power_up_power_down.md\" rel=\"nofollow noreferrer\">https://github.com/NeonHorizon/lipopi/blob/master... | RC Delay Ciruit for Pi power on | electronics | 2018-04-19T00:19:26.427 |
[
{
"message": "I have an LED Flash which I want to trigger on and off just before and after my camera captures an image for a Machine Vision application. Any ideas on what circuit set-up I can use for doing this?The Flash uses a 7.4V, 2200mAh 16.3Wh Li-ion battery. This is a link for the Flash I intend on using:... | Triggering an LED Flash | electronics | 2018-04-19T10:35:30.757 |
[
{
"message": "How can I efficiently boost 4.2v ~ 3.0v from a battery up to 5v for a short burst of current? My load is essentially an RC circuit with 17.8R and 300uF that I need to charge as fast as possible to function properly which is roughly a 281mA peak that quickly tails off.",
"role": "user"
},
{... | Efficiently Boost voltage for small single burst of current | electronics | 2018-04-19T11:39:16.033 |
[
{
"message": "I am going to make a square wave which has two different kinds of pulse width.At first,i think i can use the digital logic gate to finish it,however,after taking lots of time for trying,i still can't make it,so i come here to ask for help or suggestion.The square wave i needed is as below<a href=\... | Making a square wave which has two different kinds of pulse width | electronics | 2018-04-19T12:15:40.727 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/LijwG.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/77Wuk.jpg\" rel=\"nofollow noreferrer\">So I'm having some trouble getting to the answer of this question (which I have been told is C), and I've been trying to solve it via mesh analysi... | mesh analysis question with dependent current source | electronics | 2018-04-19T17:37:51.353 |
[
{
"message": "I'm given that after a short circuit test a one phase transformer rated at \\$2500\\$ kVA, \\$50000/10000\\$ at \\$50\\$ Hz yields the values of voltage, current and power as follows:$$720V, 225A,37947W$$.<br>The transformer has a open circuit current of \\$3\\$ \\$\\%\\$ of the nominal and the ef... | How can be calculated the open circuit power test on this transformer? | electronics | 2018-04-19T17:53:24.160 |
[
{
"message": "The part of a circuit shown below was used in one of commercially sold audio amplifiers (constant current source shown here was added to differential amplifier, whereas voltage amplification stage followed and output power stage).<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2... | Addition of HF Capacitor to Constant Current Source | electronics | 2018-04-19T20:59:39.633 |
[
{
"message": "I have four machines at 24vdc and would like to have one light(e.g. tower) on when either machine is working or when all are working. This to happen, the light is connected independently to each ps, in this case all four ps become connected in parallel. Now the question is how would all four ps re... | Four power supplies in parallel to a bacon light? | electronics | 2018-04-19T22:18:58.020 |
[
{
"message": "Why do we need two photodiodes in order to create an optoisolator or optocoupler? Many sources say that it is to compensate for the non-linearity of the diodes, but is there any explanation based on an equation or any scientific proof regarding this matter?",
"role": "user"
},
{
"messa... | Why we use two photodiodes as optoisolator or optocoupler? | electronics | 2018-04-20T05:12:16.137 |
[
{
"message": "Propagation delay is more in which topology (stripline or microstrip)???I am having mutiple signals in a high speed board and some signal are routed too long than how can i say that board trace is radiating? What are the parameters to be taken care for these?",
"role": "user"
},
{
"mes... | PCB Layout designing | electronics | 2018-04-20T05:47:27.217 |
[
{
"message": "I'm moving away from project boards for the first time and was looking to get a bit of feedback before I send my PCB design into production. I'll preface this by saying that the design itself has been prototyped and is working, and that portions of the design came from the assembler games forums, ... | Do I have adequate crosstalk and ground loop preventions in place? | electronics | 2018-04-20T09:24:43.690 |
[
{
"message": "This is buck regulator I am using for 1.8 V output: <a href=\"http://www.ti.com/lit/ds/symlink/tps62065-q1.pdf\" rel=\"nofollow noreferrer\">TPS62067.Input Voltage = 3.3 VMaximum rated current = 2 A.How the regulator will behaving if the load current increases more than 2 A ?My understanding from ... | What will be case if buck regulator (TPS62067) load current increases the rated current? | electronics | 2018-04-20T09:37:20.993 |
[
{
"message": "For a class that's rather far outside of my background, I am reading a paper about supply-demand balance in an islanded microgrid. The active power demand of the whole system can be met with renewables, but the authors' control scheme can't balance reactive power, so they say that the conventional... | How does a conventional generator produce only reactive power? | electronics | 2018-04-20T11:58:44.430 |
[
{
"message": "Is there a standard for putting a circuit schematic inside an IEEE paper? I can't find the documentation about it. I hope someone can help me with that.edit:Can i for example show a simplified version of my schematic? or do I need to put the whole schematic in the paper?",
"role": "user"
},
... | IEEE circuit schematic standards | electronics | 2018-04-20T23:30:06.297 |
[
{
"message": "I just joined and need help. I'm trying to fix the amplifier in my Chicago coin speedway arcade machine. It basically works but it has a bad hum in it. I did replace a couple capacitors that were in bad shape but the hum is still there. I finally checked the two germanium transistors in the pr... | fixing the amplifier in an old arcade machine | electronics | 2018-04-21T01:43:58.753 |
[
{
"message": "I have a signal that goes low for about 0.2μs or faster and i want to create an active low pulse about 1.8μs every time the input pulse goes low. How could i do that?I want it to drive the !WAIT pin of a cpu to give time on a slow peripheral to latch the input.Also, it would help if the output did... | Increasing pulse length | electronics | 2018-04-21T07:42:45.547 |
[
{
"message": "This circuit was given in my textbook. The source voltage is only 10 Volts, but the individual voltage drop across resistor and inductor are 6 Volts and 8 Volts respectively, which is greater than the source voltage. How is it possible? Is it possible in real practical circuits?",
"role": "use... | Voltage drops are greater than source voltage. How is it possible? | electronics | 2018-04-21T08:23:49.430 |
[
{
"message": "For the below circuit, assuming I add a short circuit between terminals A and B (let's call it Isc), howcome I can't use a KVL equation for the left loop, along with the right loop (IsR1 - IscR2 = 0)?<a href=\"https://i.stack.imgur.com/2Tp1g.png\" rel=\"nofollow noreferrer\">",
"role": "user"
... | Thevenin Norton Concept | electronics | 2018-04-21T08:34:45.787 |
[
{
"message": "For the below circuit, assuming I add a short circuit between terminals A and B (let's call it Isc), howcome I can't use a KVL equation for the left loop, along with the right loop (IsR1 - IscR2 = 0)?<a href=\"https://i.stack.imgur.com/2Tp1g.png\" rel=\"nofollow noreferrer\">",
"role": "user"
... | Thevenin Norton Concept | electronics | 2018-04-21T08:34:45.787 |
[
{
"message": "I have read from so many articles that capacitor acts as voltage source if it has some initial charge in it when connected to load. But why we consider capacitor as voltage source , why not consider as current source?",
"role": "user"
},
{
"message": "<a href=\"/plugins/schematics?imag... | Capacitor as voltage source but why not as current source | electronics | 2018-04-21T09:21:50.737 |
[
{
"message": "Hi I am trying to use 2 nested for loops in vhdl but I get this error.[Synth 8-561] range expression could not be resolved to a constant [318]I do not understand why this code is not working since cursor_pos_x or cursor_pos_y are not constants.this is the for loops I have<pre><code> for i in (cu... | getting error from for loops in vhdl | electronics | 2018-04-21T19:04:03.370 |
[
{
"message": "I am tasked with the following exercise:<a href=\"https://i.stack.imgur.com/7c1A8.jpg\" rel=\"nofollow noreferrer\">I am still finding Thevenin equivalent circuits challenging, and this example looks a bit daunting since it seems to have an external loop. Hopefully, I made the correct assumption (... | Thevenin equivalent circuit with external loop | electronics | 2018-04-21T19:29:56.410 |
[
{
"message": "I have two inverters, driven by two IRF530 mosfets. I need to drive them with a specific phase shift. What is the simplest, most basic way to do it, for simple prototyping? (I am neglecting PWM modulation for first prototype, I just want to make circuit work) I am currently trying with LM5046, but... | Simplest phase-shifted gate drive for two mosfets | electronics | 2018-04-22T00:09:01.950 |
[
{
"message": "I have a Panasonic landline (wireless) setup in my home. They have multiple charging stations, 2 remote bases, and one actual base station. They’ve worked reliably for at least 8 years, and I know Panasonic is excellent quality. Recently, I’ve noticed one handset hisses during charging. It doe... | Capacitor Hissing? | electronics | 2018-04-22T02:48:16.653 |
[
{
"message": "This is specifically a high-level hobbyist question, I'm not really looking for schematics or anything of the sort.To deliver Ethernet over Coaxial, what sort of high-level designs or common issues will I need/face in completing this task? Initial research found that this technology is also referr... | MoCa - Ethernet over Coaxial | electronics | 2018-04-22T09:40:24.110 |
[
{
"message": "I'm venturing into building switching PSUs. Voltages on the order of 5-20v, current 1-10A.To be optimised would be the efficiency of the power MOSFET(s), hence Vgs and Vds rise and fall times. Ive got a 20MHz 48Ms/s Hantek USB scope - the cheapest I think. An ancient 500kHz Jupiter function genera... | Measure rise & fall time of MOSFET switching - cheaply | electronics | 2018-04-22T10:01:33.183 |
[
{
"message": "The real device is <a href=\"https://www.ebay.com/itm/Ultrasound-Ultrasonic-Facial-Body-Care-Pain-Therapy-Relief-Massager-Beauty-Tool/172015606527?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649\" rel=\"nofollow noreferrer\">this.<br>The LT SPICE model is <a href=\"https://drive.goo... | SPICE modelling output/input coupling in ultrasonic transducer driver | electronics | 2018-04-22T15:50:42.063 |
[
{
"message": "I've come across some graphs comparing the impedance of a capacitor over frequency and it understandably declines as frequency increases -- up until a certain point. Afterwhich, the impedance begins to increase, like an inductor. <a href=\"https://i.stack.imgur.com/eDhpx.png\" rel=\"noreferrer\">W... | Why does a real world capacitor behave like an inductor at frequencies above its self-resonant frequency? | electronics | 2018-04-22T22:58:59.833 |
[
{
"message": "<a href=\"https://sites.google.com/site/chipstein/home-page/eeg-with-an-arduino/assembling-the-arduino-eeg-circult\" rel=\"nofollow noreferrer\">https://sites.google.com/site/chipstein/home-page/eeg-with-an-arduino/assembling-the-arduino-eeg-circultHi, I am currently building a DIY EEG circuit usi... | Homemade EEG Circuit Common mode feedback | electronics | 2018-04-23T01:48:45.657 |
[
{
"message": "I'd like to interface my main microcontroller's hardware serial port to two (or more) devices at the same time. My understanding is that UART on my microcontrollers is based on an active-low 5V TTL.(I know what I'm explaining here can be technically achieved by using better protocols such as SPI a... | Multiplexing UART | electronics | 2018-04-23T01:51:35.950 |
[
{
"message": "I am using a MCP45HV51 digital potentiometer for gain control. (Datasheet: <a href=\"http://ww1.microchip.com/downloads/en/DeviceDoc/20005304A.pdf\" rel=\"nofollow noreferrer\">http://ww1.microchip.com/downloads/en/DeviceDoc/20005304A.pdf)I set up the device according to the datasheet and control ... | MCP45HV51 Register does not change | electronics | 2018-04-23T12:42:53.690 |
[
{
"message": "Can we store the value of a port to a variable...I mean is c=portd; possible?If so..why do we have a pinx register to read values?What is the difference between the two?",
"role": "user"
},
{
"message": "The PORTD register is buffered, it's a one way register in the sense that the pin... | Microcontroller registers (atmega16) Can we store the value of a port to a variable directly using portx register without the pinx register? | electronics | 2018-04-23T12:55:27.947 |
[
{
"message": "I've a full bridge rectifier and I put the following function into it:$$5\\sin(100\\pi t)\\tag1$$So, at the output I get:$$\\left|(5-2V_d)\\sin(100\\pi t)\\right|\\tag2$$Where \\$V_d\\$ is the voltage over one diode.Now, why do I measure (with a Fluke multimeter) a DC-voltage of \\$1.4\\$ volts an... | Measuring an AC-voltage at the ouput of a full bridge rectifier | electronics | 2018-04-23T16:02:41.753 |
[
{
"message": "I'm looking for a logic gate IC that implements a set of AND gates with one leg that is common to all AND gates and one that isn't. To create a \"group enable\" function where if the common input is low, all outputs are 0 and if it is high inputs on the non-common input are passed through to the o... | AND gates with one common input | electronics | 2018-04-23T17:57:29.023 |
[
{
"message": "Reading about the differential amplifier in The Art of Electronics, we are introduced to this circuit.It is claimed that the common mode input voltage is limited at the upper end by \\$Q_2\\$'s collector quiescent voltage of \\$2.5V\\$. Understanding this limitation was because of \\$Q_2\\$'s sat... | How to reduces nonlinearities due to the saturation of one of the BJTs in a differential amplifier | electronics | 2018-04-24T00:38:16.787 |
[
{
"message": "I would like to ask for advice on shielding the following setup.I have a measurement target sitting inside a Faraday cage, connected through a shielded cable to a measurement circuit. The cable shield would be connected to the Faraday cage. The circuit mainly includes a microcontroller, AD convert... | How to shield a battery powered instrumentation with USB interface? | electronics | 2018-04-24T01:08:02.737 |
[
{
"message": "I was doing my hardware hack project on an air quality monitoring device which uses <code>STM32L476</code> processor.<br><a href=\"https://i.stack.imgur.com/ATJV3.jpg\" rel=\"nofollow noreferrer\">My only experiences with hardware hacking are IPcams or wifi routers with UART consoles available. Bu... | STM32L MCU - SWD pin on board not matching processor pinout | electronics | 2018-04-24T09:29:29.537 |
[
{
"message": "I want to drive two sets of 3 LEDs. They are all 35V but the two sets differ in color spectra and current: the first set needs 900mA the other 500mA.I want to freely mix the two sets using PWM, so that the total power consumption always stays between 72W and 100W.One easy way to do this would be ... | LED mixing: 2 off-line drivers vs 1 powersupply + 2 buck converters | electronics | 2018-04-24T13:07:06.173 |
[
{
"message": "I'm currently doing a lot of work in measuring transfer functions of circuits. One thing that crops up a lot is mains frequency noise:<a href=\"https://i.stack.imgur.com/QV4EJ.png\" rel=\"nofollow noreferrer\">As you can see there is a huge 11 dB leap at 50 Hz, followed by harmonics all the way up... | Mains frequency noise components | electronics | 2018-04-24T13:11:50.560 |
[
{
"message": "I'm trying to make my fog lights work with the parking lights, so I have one continuous strip of light. While I'm handy enough to craft it, designing the circuit so that I retain proper factory functionality is beyond my skills. I'll try my best to explain what I need, please go easy on me if I me... | How to add second, lower power source to car fog light? | electronics | 2018-04-24T18:26:19.377 |
[
{
"message": "Suppose I want to build a simole circuit that reads the temperature as a voltage from the sensor. If the voltage gets below a certain value, turn the heater on (1). Else, turn the heater off (0). How would I build this circuit?",
"role": "user"
},
{
"message": "<a href=\"https://i.sta... | How to convert temperature to an ON-OFF state | electronics | 2018-04-24T19:03:30.780 |
[
{
"message": "I'm building a circuit that can turn on a relay when the variable resistor cools down.Its operating principle is cooling down the variable resistor increases its resistance, causing the voltage at Node 1 to increase until BJT 2 turns on, driving BJT 1, driving the relay. The LED is there as a visu... | Why is my relay oscillating for over a half-second? | electronics | 2018-04-25T00:30:12.140 |
[
{
"message": "I have a buck regulator that takes 4.4-36V input voltage, and gives 3,3V 1A output. It will have two voltage sources, one potentially 25V and one 5V. Do I need a mosfet circuit to make only one source active at a time? OR Can I use two diodes in this way to protect the sources? The buck regulator ... | Two input voltages to buck voltage regulator, using diodes to protect the sources | electronics | 2018-04-25T10:43:29.047 |
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