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": "I have this circuit connected to an Arduino DUE.<a href=\"https://i.stack.imgur.com/7KS3T.png\" rel=\"nofollow noreferrer\">It is an audio application and it works, but I have a ton of noise in my project. I initially thought it was quantization noise because the ADCs are 12 bit.After consulting f... | Proper Decoupling | electronics | 2017-11-06T13:16:43.957 |
[
{
"message": "I'm trying to build a circuit that can output current from 5ma to 2Amps using BJT TIP120. Voltage is 18v and constant. I tried designing a simple circuit. Please check the image below and let me know your comments. Thanks in advance.<a href=\"https://i.stack.imgur.com/kMVrS.jpg\" rel=\"nofollow no... | 5 ma to 2 amp variable current circuit using TIP120 BJT. Please analyze my circuit and comment | electronics | 2017-11-06T20:59:17.520 |
[
{
"message": "I am reading the 12th edition of \"Modern Control Systems\" from Richard C. Dorf and Robert H. Bishop which is about control systems.It is not totally clear to me how the author came up with the formula in the problem's solution I describe below.The problem:<a href=\"https://i.stack.imgur.com/M0Xd... | control systems - What is \$\det[sI-A]\$? | electronics | 2017-11-06T21:10:07.533 |
[
{
"message": "My question is, how was \\$ I_{stator} \\$ found out?Y -connected 3-phase 4-pole induction motor has \\$ R_r = 0.5\\$ Ohm , and is supplied from a 480V l - l, 60Hz source. It is connected to a load that has load torque \\$ T_L = 3 + 1.3 \\cdot 10^{-3} w^2 \\$, with \\$ w \\$ the rotor mechanica... | Asynchronous induction motor, current in stator | electronics | 2017-11-07T03:50:21.670 |
[
{
"message": "I want to measure negative pressure which is generated by a diaphragm / membrane pump with 0,5 Bar (according specification).I am not sure if such a sensor as this <a href=\"https://sensing.honeywell.com/HSCDAND001BASA3-amplified-board-mount-pressure-sensors\" rel=\"nofollow noreferrer\">https://s... | Measuring negative pressure with a raspberry pi and I2C Pressure Sensor | electronics | 2017-11-07T09:44:43.117 |
[
{
"message": "The circuit below should be taking a 3.3V signal from an MCU on MCU_LS12 and outputting a 12V high-side signal.The output is always 12V. On scoping the base to the output transistor is not being pulled to ground \"enough\" - only going 12V then to 11.5V. What am I missing? Input signal on LS12 is ... | Why won't this PNP Transistor trigger? | electronics | 2017-11-07T14:31:45.713 |
[
{
"message": "I'm in an assembly language programming course and our professor casually dropped a homework assignment in electrical engineering topics. (I'm a software engineering student, so I've not had any training on this.)I'm given this problem:Determine the values and power ratings of the resistors R_b an... | Determine the values and power rating of the resistors to bias the transistor | electronics | 2017-11-07T16:49:38.970 |
[
{
"message": "Sorry, this is a very odd question, I've however exhausted my google-fu and I don't even know what question to ask to get the information that I'm looking for. (I'm a programmer so pardon the lack of electronics lingo, as this isn't my specialization). I'm looking for a component that has the same... | DRAM -> However all I want is the capacitor array, (or does a circuit like this even exist)? | electronics | 2017-11-07T17:36:47.727 |
[
{
"message": "This question is related to the following link and Longley-Rice Propagation Model<a href=\"https://www.itu.int/dms_pubrec/itu-r/rec/p/R-REC-P.453-11-201507-S!!PDF-E.pdf\" rel=\"nofollow noreferrer\">https://www.itu.int/dms_pubrec/itu-r/rec/p/R-REC-P.453-11-201507-S!!PDF-E.pdfIn the Longley-Rice Pr... | How surface refractivity affect radio propagation? | electronics | 2017-11-08T03:20:02.120 |
[
{
"message": "What should I do to the circuit: so that the LED is lit. Multisim <a href=\"https://1drv.ms/u/s!Anq2KXMNfyPrxWQoi9xDzVpTfmK1\" rel=\"nofollow noreferrer\">fileI know Q1 does not have ground nor is the VCC connected to the Q2. The above is part of this commercially sold driver board Note that VCC... | Simple transistor switching circuit | electronics | 2017-11-08T06:03:33.523 |
[
{
"message": "I have implemented a VGA controller in FPGA, for 800x600 resolution @60Hz. Can I use it to drive a PC monitor ? In the PC's monitor resolution settings, it's seen that it supports multiple resolution at different frame rates, including 800x600. The maximum is 1024x768. Its an LCD monitor. Will the... | FPGA based VGA controller to drive PC monitor | electronics | 2017-11-08T13:02:30.673 |
[
{
"message": "I have a low light source that I would like to convert to an electrical signal. I have tried the pin silicon photodiodes without success. I believe I need an Avalanche Photodiode to make my project work. I am not an electrical engineer, so I need help and advice before I purchase. I would like the... | Using and Understanding Avalanche Photodiodes | electronics | 2017-11-08T18:56:51.183 |
[
{
"message": "I am currently investigating on how to build RF transmitter and receiver circuits to try and build an RC device from scratch. I've come across this Pierce Oscillator Diagram and build it on a breadboard to test it using a 27 MHz crystal resonator. <a href=\"https://i.stack.imgur.com/yifxJ.jpg\" re... | How does this Pierce Oscillator work? | electronics | 2017-11-08T23:46:12.180 |
[
{
"message": "The information below pertains to an induction motor: <blockquote> The magnetic capacity of the motor's magnetic (iron) circuit is designed to the relationship: voltage/frequency (V/f). If the frequency drops the V/Hz goes up. This means that the motor needs a larger magnetic circuit. Without ... | How can increasing the voltage/frequency ratio of an induction motor result in magnetic saturation? | electronics | 2017-11-09T10:52:11.253 |
[
{
"message": "I am working on an NI measurement system. I tried to measure the dynamic range of the system and I got about 100 dB. On this system I can easily change the number of samples per average (for example, from 100 samples per average to 10k samples per average). When I do that, the dynamic range change... | Relationship between dynamic range and number of samples | electronics | 2017-11-09T11:48:46.443 |
[
{
"message": "Had a few issues with a high side using darlingtons etc - what would be simplist 3v3 logic driven hi side (12V output) driver (I'm thinming fet) that can handle 1-2A for running a solenoid, as a switch - frquncy is VERy low like on for 10 mins, off for 5 etc.tia",
"role": "user"
},
{
... | Easy High Side Driver | electronics | 2017-11-09T12:51:56.373 |
[
{
"message": "I was trying to solve this question but I got stuck when I tried to use AND gate with clock and some output. I want to ask whether value of rising edge of a clock is taken as 1 or value preceding it and same for falling edge does it is taken to be 0 or value preceding it while gating clocks ?What ... | How to proceed to solve this question? | electronics | 2017-11-09T17:04:13.870 |
[
{
"message": "While I am aware of the risk associated with charging Li-ion below 0 °C and that the charge acceptance for a NiMH battery decreases with rising temperature, I am finding conflicting information when it comes to charging NiMH batteries below 0 °C.<a href=\"http://batteryuniversity.com/learn/articl... | Can NiMH batteries charge at cold temperatures? | electronics | 2017-11-09T18:03:59.617 |
[
{
"message": "BackgroundFor transimpedance applications, you want to keep op amps in their linear region and avoid op amp saturation and overdrive recovery.This can be done with a simple automatic gain control circuit when using a unity gain stable op amp e.g.<a href=\"/plugins/schematics?image=http%3a%2f%2fi.... | How to keep decompensated op amp in linear region? | electronics | 2017-11-10T01:15:44.357 |
[
{
"message": "I have a general understanding of how a transformer works and the whole magnetic induction process works, and I also understand that there is heat associated with high current electricity flow, so my question is this: Is it safe to construct a homemade transformer that would function similar to a ... | Homemade Transformer | electronics | 2017-11-10T02:15:29.017 |
[
{
"message": "A 8.8 kW, 220 V, 1200 rpm dc shunt motor has armature resistance of 0.1 Ω and field resistance of 100 Ω. The rotational loss is 2200 W. Compute: a) The rated load torque on the shaft. b) The armature current. I have worked out the rated load torque which the answer is 70Nm. However, i have no ide... | how to find armature current in dc shunt motor in given question? | electronics | 2017-11-10T04:44:02.753 |
[
{
"message": "I have made a button box, using an Arduino mini pro, which includes LEDs and buzzers. I am using a shift register (74HC595) with a ULN2003 (to use 12v on the LEDs) to decode the SPI.See the top right in: (sorry about the schematic, but I am quite new to electronics.)<a href=\"https://i.stack.imgur... | Startup Buzzer Sound | electronics | 2017-11-10T09:14:00.497 |
[
{
"message": "I have a problem when calculating voltage over resistor because one method worked for one problem but not the next.<a href=\"https://i.stack.imgur.com/SWdX6.png\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/Bb1F9.png\" rel=\"nofollow noreferrer\">I solved (b) like this:$$12-4=8... | Calculate voltage over resistor | electronics | 2017-11-10T09:34:13.693 |
[
{
"message": "(source: <a href=\"https://circuitdigest.com/electronic-circuits/remote-controlled-light-switch\" rel=\"nofollow noreferrer\">https://circuitdigest.com/electronic-circuits/remote-controlled-light-switch)How does the BC557 PNP transistor in this circuit work?Based on the information about PNP trans... | How does the PNP transistor in this IR receiver circuit work? | electronics | 2017-11-10T12:42:46.623 |
[
{
"message": "(source: <a href=\"https://circuitdigest.com/electronic-circuits/remote-controlled-light-switch\" rel=\"nofollow noreferrer\">https://circuitdigest.com/electronic-circuits/remote-controlled-light-switch)How does the BC557 PNP transistor in this circuit work?Based on the information about PNP trans... | How does the PNP transistor in this IR receiver circuit work? | electronics | 2017-11-10T12:42:46.623 |
[
{
"message": "There is a 6-wire Wheatstone bridge type load-cell and one of the wire is called shield and it is electrically connected to the metallic case of the load cell as below(I marked that with yellow indicators):<a href=\"https://i.stack.imgur.com/Bs6cn.jpg\" rel=\"nofollow noreferrer\">Two identical lo... | Confusion in grounding shield wires of transducers | electronics | 2017-11-10T16:46:17.433 |
[
{
"message": "I've previously built this circuit to control a submersible pump with a PIR sensor:<a href=\"https://i.stack.imgur.com/Geocg.png\" rel=\"nofollow noreferrer\">I'm now going to add a float switch to the circuit to prevent the pump running if the water level gets too low. I would like to also includ... | How to Implement Float Switch On/Off LEDs | electronics | 2017-11-11T05:33:46.530 |
[
{
"message": "I've previously built this circuit to control a submersible pump with a PIR sensor:<a href=\"https://i.stack.imgur.com/Geocg.png\" rel=\"nofollow noreferrer\">I'm now going to add a float switch to the circuit to prevent the pump running if the water level gets too low. I would like to also includ... | How to Implement Float Switch On/Off LEDs | electronics | 2017-11-11T05:33:46.530 |
[
{
"message": "I have <a href=\"http://www.bulgin.com/vertical-power-entry-module-bzv49-bzv50-series-c20-cold-condition-inlet-px0598-group.html\" rel=\"nofollow noreferrer\">this IEC connector with an illuminated single-pole switch.Here is how it looks like from back side:<a href=\"https://i.stack.imgur.com/ZWCX... | Unable to configure a simple IEC connector with an illuminated switch | electronics | 2017-11-11T15:32:23.403 |
[
{
"message": "I am doing a design in vhdl for FPGA. I have a top level design which consists of 3 components: clock divider, Module_1 and Module_2. Top level entity has a clock input port. This clock is divided by the clock divider to get two other clocks: clock_1 and clock_2. They are fed to Module_1 and Modul... | Get_ports vs Get_pins vs Get_nets vs Get_registers | electronics | 2017-11-11T19:36:57.140 |
[
{
"message": "I'm trying to understand whether it's feasible to build a monostable multivibrator from an ECL flip flop w/ reset. The goal is to produce a 300-400ps pulse when the flip-flop is clocked and D is also high.My understanding is that the output of a flip flop can possibly be fed back to the reset in o... | Building a Sub-nanosecond Monostable with ECL Flip-Flop | electronics | 2017-11-11T21:13:54.720 |
[
{
"message": "I am beginning my study of electrical engineering and I apologize in advance if this question has been asked or if this question does not make any sense. I was wondering why short circuits are \"bad\" and complete circuits are \"good\".From what I understand, when you have a battery, and short the... | Short Circuit vs. Complete Circuit | electronics | 2017-11-11T22:53:18.487 |
[
{
"message": "I'm outside in full sunlight trying out some new solar cells I soldered together. I have a string of cells lined up like this:<a href=\"https://i.stack.imgur.com/kAacm.png\" rel=\"nofollow noreferrer\">My DMM reads 3.14V open circuit and 0.8A short circuit. I take two more strings and connect them... | Why are my solar cell currents not adding up? | electronics | 2017-11-11T22:55:29.547 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/bCyHn.jpg\" rel=\"nofollow noreferrer\">this circuit is a occupancy light circuit i want to know the working of the transistor regarding base,collector and emitter in the transitor",
"role": "user"
},
{
"message": "<a href=\"https://i.stack.imgur.com... | can you explain me the working of this circuit in detail? | electronics | 2017-11-12T13:40:02.553 |
[
{
"message": "I know that the power factor of an induction motor varies with load and is very low at no load and high at full load, but does the reactive power vary as well? If so, how much can it vary?",
"role": "user"
},
{
"message": "When the load decreases, the power factor decreases primarily d... | Does reactive power of induction motor vary with load? | electronics | 2017-11-12T16:23:44.287 |
[
{
"message": "I need digital chip (low power consumption, can't use arduino or simular devices) which will put output pin high for a few ms when there is digital change on input pin (from hight to low or from low to high). Digital chip or circuit has one input and output pin. I don't know name of these device o... | digital chip trigger output high on change input | electronics | 2017-11-12T17:38:52.333 |
[
{
"message": "I'm new to Verilog. I was trying to write the next Finite State Machines (miley machine) in Verilog:<a href=\"https://i.stack.imgur.com/9rvCj.jpg\" rel=\"nofollow noreferrer\">this what I got:<pre><code>// clk - clock, i - input, o - outputmodule test (clk,reset,i,o);input clk,reset,i;output o;... | Finite state machines in verilog | electronics | 2017-11-12T17:39:33.943 |
[
{
"message": "Suppose I measure both current and voltage going to an electric motor. So that I have two continuous streams of three phase data (current and voltage).I want to use this data to diagnose potential problems with the motor. Some motor faults are supposed to have a small effect on the current pattern... | How to compensate for grid quality changes in three phase power | electronics | 2017-11-13T15:16:46.820 |
[
{
"message": "Bjt in active region, physical representation:<a href=\"https://i.stack.imgur.com/yjhUp.jpg\" rel=\"nofollow noreferrer\">In circuit:<a href=\"https://i.stack.imgur.com/BfMBw.jpg\" rel=\"nofollow noreferrer\">Why is that in circuit base connects to emitter? Shouldn't it connect to \"P\" area, and ... | Bjt active in circuit, \$ V_{cb} \$ is ignored, why? | electronics | 2017-11-13T17:35:54.970 |
[
{
"message": "I have a 555 timer clock output controlling a few things, one of them is the coil of a 24v relay. How can I take the 5v coming from the 555 and pump it up to 24v. ?<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fyRO5T.png\">simulate this circuit – Schematic created usi... | 5v clock signal to 24v | electronics | 2017-11-13T19:18:38.070 |
[
{
"message": "We have a battery and using 4 switches and logic gates build the system where if any of the switches is closed light should be turned on.",
"role": "user"
},
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2frLXuD.png\">simulate this circuit – Sch... | Building a circuit | electronics | 2017-11-13T21:54:41.423 |
[
{
"message": "I wanted to poke around one of those sub-10$ smart bands, so I got a couple of them. I opened it and I was able to identify some major components from the SMD markings, including a Dialog DA14580 MCU, XC6206 3V 200mA LDO VReg, XT4054 Battery Charger IC, ...This smart band acts as a pedometer, so m... | Identifying component from i2c trace & obscure SMD marking | electronics | 2017-11-14T00:26:00.023 |
[
{
"message": "I'm learning myself a simple circuit, where a BJT is used as a switch for a motor load. It'd look like this example; you can easily find tons of such.In the internet, they say that I need a diode that:allows the current to flow in only one directioncan hold out some short-time high voltagesis conn... | How does the diode work out the reverse voltage spike of DC motor? | electronics | 2017-11-14T03:21:16.447 |
[
{
"message": "I'm working on some project which is not really related to digital circuits but rather boolean algebra analysis.In some point I stucked at algorithmic or maybe data structure problem:How to effectively determine if given truth table is equal to another one (when we take into account that they can ... | How to effectively determine if given truth table is equal to another one (when we take into account that they can differ at order of inputs) | electronics | 2017-11-14T10:17:03.010 |
[
{
"message": "I am using standard schematic of level shifter.<a href=\"https://i.stack.imgur.com/ARF9d.png\" rel=\"nofollow noreferrer\">It is used to communicate with avr and sometimes reset it. Everything works fine except for reset line. After the first pulling down I am not able to make it high again.Screen... | Bi-Directional MOSFET level converter problem | electronics | 2017-11-14T14:17:34.690 |
[
{
"message": "I am trying to read ADC values on the Nucleo-F722ZE board. I have 3V from a power supply connected to pin PA3 on the Nucleo. Verified that the pin on the processor reads 3V.Grounds from the power supply and the Nucleo are connected.I checked the voltages on AVDD/VREF, they are correct at ~3.3VHowe... | ADC on STM32, Nucleo-F722ZE | electronics | 2017-11-14T14:52:08.413 |
[
{
"message": "I'm experimenting with LEDs with Arduino and have a question.For example; I have one basic 20mA LED that runs constant at 3.3v.I have another LED with that I PWM with a low duty cycle (6%). I up the voltage of this LED by x%~.I have learned from this experiment that if the second LED passes the 20... | LED modulated @ high voltage -vs- constant @ low voltage | electronics | 2017-11-14T21:11:07.153 |
[
{
"message": "I'm experimenting with LEDs with Arduino and have a question.For example; I have one basic 20mA LED that runs constant at 3.3v.I have another LED with that I PWM with a low duty cycle (6%). I up the voltage of this LED by x%~.I have learned from this experiment that if the second LED passes the 20... | LED modulated @ high voltage -vs- constant @ low voltage | electronics | 2017-11-14T21:11:07.153 |
[
{
"message": "I recently disassembled an old digital point and shoot camera and found the following micro DC motor (as can be seen in the image)<a href=\"https://i.stack.imgur.com/w1gpo.png\" rel=\"nofollow noreferrer\">It is probably part of the auto focus system. Also, there is a slotted disk connected to th... | What is this encoder with micro DC motor in camera auto focus system? | electronics | 2017-11-15T07:10:16.610 |
[
{
"message": "I am new to electronics and have used flashing LEDs with chips built into them before now, but this time I am going to be using 8 LEDs total, and want them to stay in sync.I want to have a setup where the output switches between two different outputs which each have four LEDs every 1/2 second (or ... | Switch between two outputs on a timer | electronics | 2017-11-15T10:51:12.830 |
[
{
"message": "I need to design a 10KHz 310V DC to 220V AC inverter.After searching a lot on the web, I finally found the following DIY circuit based on the irs2453 chip:<a href=\"https://www.homemade-circuits.com/?s=Simplest%20Full%20Bridge%20Inverter%20Circuit\" rel=\"nofollow noreferrer\">irs2453 based circui... | irs2453 - what type of wave and what maximum possible frequency | electronics | 2017-11-15T14:17:21.577 |
[
{
"message": "<a href=\"https://youtu.be/qM7_h8my8eA\" rel=\"nofollow noreferrer\">This video says I should see ohmmeter deflection with an NPN transistor, placing positive probe on the base, and negative probe on collector or emitter. A BC547 NPN is giving me opposite results - <a href=\"http://www.gardnerbend... | Testing a Bipolar Junction Transistor using an analogue ohm-meter? | electronics | 2017-11-15T15:06:58.327 |
[
{
"message": "It's my first time here, and i'm starting asking a question, but I hope I can help some people in the future.So, my Teacher showed this exercise to us and i'm wrapping my mind around it without sucess.<a href=\"https://i.stack.imgur.com/s5rqi.png\" rel=\"nofollow noreferrer\">So he asked us to fin... | Find the Min Value of R in a Zener-Transistor Regulator | electronics | 2017-11-15T15:35:44.307 |
[
{
"message": "My exposure to EE is more than half a century old (sorry). I want to investigate the near-field pattern of a variety of antenna configurations at 75MHz. I have purchased an AD8307 broadband detector power meter. I intend to feed that from an array of simple dipoles (quarter wavelength = one meter)... | Can an opamp be used in a 75MHz narrow band pass filter? | electronics | 2017-11-15T17:30:15.400 |
[
{
"message": "I got this <a href=\"https://rads.stackoverflow.com/amzn/click/B0002BEUYO\" rel=\"nofollow noreferrer\">automatic antenna for a project, but the torque is a little too high. It runs on 12V. I've figured the way it works is, it knows to stop when the load increases to a certain point (i.e. somethin... | Decrease torque of an electric motor | electronics | 2017-11-15T19:21:53.940 |
[
{
"message": "<blockquote> Minimum number of complementary CMOS transistors pair will be required to implement function,\\$F=ABC+\\overline{(A+B+C)}\\$ are? \\$(A)6\\$ \\$(B)7\\$ \\$(C)8\\$ \\$(D)9\\$</blockquote>I tried like this but I am getting 7 CMOS pair but answer key says its 9 CMOS pair.w... | Minimum number of complementary CMOS to implement \$F=ABC+\overline{(A+B+C)}\$? | electronics | 2017-11-16T09:24:27.890 |
[
{
"message": "I am trying to determine the best way to ground the following audio circuit for best RF immunity. Right now I'm looking at two options, and am not sure if there's even really much of a difference between the two. Option 1:<a href=\"https://i.stack.imgur.com/vkFYO.jpg\" rel=\"nofollow noreferrer\">... | Grounding audio circuit for RFI immunity | electronics | 2017-11-16T10:26:52.253 |
[
{
"message": "I am trying to build a centre-off model railway controller, no reversing switch. I am working on the overload/short detection part of the circuit based on sensing the voltage across a 0R68 resistor. I want to trigger at about 1A, i.e. approx. 0.7V across Rsense. The current flow will be bi-directi... | Positive and Negative Sense Circuit. How/why does this work? | electronics | 2017-11-16T11:53:50.783 |
[
{
"message": "What is the advantage of using two feedback optocouplers? I'm not sure why this single voltage power supply would use 2.<a href=\"https://i.stack.imgur.com/EmOz4.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/kTZse.jpg\" rel=\"nofollow noreferrer\">",
"role": "user"
},... | Use 2 optocouplers? | electronics | 2017-11-16T15:35:17.623 |
[
{
"message": "I'm planning to drive two white leds like these (<a href=\"http://www.farnell.com/datasheets/1842943.pdf?_ga=2.178556324.10867546.1510588985-72860327.1507544182\" rel=\"nofollow noreferrer\">datasheet) with PAM2803 driver (<a href=\"https://www.diodes.com/assets/Datasheets/PAM2803.pdf\" rel=\"nofo... | Driving two leds with PAM2803 | electronics | 2017-11-16T16:08:33.983 |
[
{
"message": "I'd like to drive the XTAL input to a chip with a logic signal (3V3, 32kHz square) instead of using a real crystal. In general, is this okay, or does the signal need to be filtered/attenuated? At the electrical level, are there any particular things that need to be considered?(In particular, the c... | Drive XTAL input with logic signal | electronics | 2017-11-16T16:21:15.553 |
[
{
"message": "I want to make a transformer with a core of laminated electrical steel sheets. I have some EI core sheets, 0.5mm thick. My design is for a gapped core transformer, and the shape of the gap is unusual, so I need to cut the sheets to get the gap I want. I am considering using water jet cutting as th... | The effect of rust on a transformer core | electronics | 2017-11-16T16:40:35.760 |
[
{
"message": "I have built a <a href=\"https://electronics.stackexchange.com/questions/330465/how-to-implement-opamp-floating-input-protection\">Voltage Controlled Current Source that has no ON/OFF switch. This VCCS simply receives a voltage and outputs current to a DUT. The DUT is basically a high-power variab... | High side switching of a current source with 3.3V logic | electronics | 2017-11-16T17:05:50.000 |
[
{
"message": "LTspice calculates the DC operating points for the below circuit as as:<a href=\"https://i.stack.imgur.com/0KZIp.png\" rel=\"nofollow noreferrer\">I have couple of questions here:1-) If I would perform DC operating point for this circuit with pen and paper, I would first: short all the inductors a... | A confusion on DC operating point in SPICE | electronics | 2017-11-16T19:13:53.820 |
[
{
"message": "I'm confused by the datasheet for the <a href=\"http://www.onsemi.com/PowerSolutions/product.do?id=FQB55N10TM\" rel=\"nofollow noreferrer\">FQB55N10:<a href=\"https://i.stack.imgur.com/oVNXk.png\" rel=\"nofollow noreferrer\">75nC typical total gate charge = 13nC typical gate-source charge + 36nC t... | What contributes gate charge in a MOSFET besides gate-source capacitance and gate-drain capacitance? | electronics | 2017-11-16T19:17:13.127 |
[
{
"message": "I'm attempting to represent the following fritzing diagram* as a schematic (using circuitlab).*from <a href=\"https://learn.adafruit.com/ir-sensor/testing-an-ir-sensor\" rel=\"nofollow noreferrer\">https://learn.adafruit.com/ir-sensor/testing-an-ir-sensor<a href=\"https://i.stack.imgur.com/s1uRr.g... | Does this schematic represent the fritzing circuit properly and can you explain how pulled low works in this IR sensor? | electronics | 2017-11-16T21:51:01.037 |
[
{
"message": "I have read that initial values to a signal can be set in an FPGA since the design is \"loaded into it\" after power up. However, in ASICs we can only rely on a reset signal to put all signals into a known state. Thus, is assigning initial value to all signals in code that shall be synthesized a g... | Is it good practice to always assign initial value and reset signals in digital design? | electronics | 2017-11-16T23:28:45.543 |
[
{
"message": "I want to chain up a very long LED strip to a single source of data. I will be using an ESP8266 and about 15 meters of WS2812b LEDs. With about 30 LEDs per meter, I need to power about 450 of these total. I've read multiple places they're about 60 mAh each, so <code>60 * 450 = 27A</code> required ... | Chaining up 5v LED strips using 5v cellphone chargers | electronics | 2017-11-17T19:31:41.480 |
[
{
"message": "I measured the forward voltage of two CoB LEDs at 600mA then wired them in parallel driven by 1200mA. Why is the parallel Vf higher than the individual forward voltages?Forward Voltages:<br><pre><code>Only LED1 @ 600mA 33.4VOnly LED2 @ 600mA 34.2VParallel @ 1200mA 34.9V </code></pre... | LED Parallel Forward Voltage Higher Than Indvidual LEDs Vf | electronics | 2017-11-17T23:22:28.127 |
[
{
"message": "Many picture of SAR ADC blocks from the internet show that the output of SAR logic is the output of the SAR ADC, but I also found that lots of papers show the output by using the \\$V_{DAC output} \\$ and the \\$V_{in}\\$ ,like the picture below.<a href=\"https://i.stack.imgur.com/pdIP3.png\" rel=... | The output of a SAR ADC | electronics | 2017-11-18T02:54:24.880 |
[
{
"message": "A note on my background: I'm a programmer in an electronic design company, starting out with hobby projects.I'm planning to design a PWM LED strip dimmer and colour controller for an RGB/RGBW led strip (yes, this is a hobby project). Before I start picking parts and drawing the schematics I want t... | Design considerations for LED strip PWM dimming | electronics | 2017-11-18T03:07:27.277 |
[
{
"message": "I have to run 8 PWM signals out of an Arduino Mega to motor controllers that are placed anywhere from 25 ft. (7.62 m) away to 150 ft. (45.72 m) away. I expect the voltage drop will be high.The alternate solution is to send a serial or ethernet message to 8 different Arduinos placed next to the mo... | Running 5VDC signal a long distance | electronics | 2017-11-18T15:51:23.190 |
[
{
"message": "Looking online for small SSD1306 OLED screens to use with Arduino over I2C, I find products that look like this:<a href=\"https://i.stack.imgur.com/C3eTB.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/e8o74.jpg\" rel=\"nofollow noreferrer\">The sellers don't offer datasheets... | OLED 5V-tolerant SCL and SDA | electronics | 2017-11-18T16:23:41.727 |
[
{
"message": "I recently made a slayer exciter which produces arcs about 1-2 inches long. It also makes any electronic device near it go mad (it froze my iphone 6S when I was recording the arcs). What radiation is being produced? Electric field, electromagnetic waves etc. If it can create high voltage on any me... | Slayer Exciter Health Hazards | electronics | 2017-11-18T17:49:30.440 |
[
{
"message": "Last night after a gig my audio Mixer output cables has had a small contact with the pin of the power supply of my guitar pedals that was on electricity.The mixer was not on electricity but the VU meters of the mixer detected the contact.The mixer is working normally, but may have caused damages t... | Mixer Audio output xlr small contact with pin power suply of guitar pedals , possible damages? | electronics | 2017-11-19T11:16:04.817 |
[
{
"message": "I have just been given an old and slightly damaged CCTV camera (a skip find) and am trying to figure out the correct wiring before applying 12V power to it.The wires are coloured and labeled as such:ACP - WhiteACP - Black12V - RedGND - Cable shieldingVBS - YellowThe unit is marked as being able to... | CCTV camera wiring | electronics | 2017-11-19T18:41:07.017 |
[
{
"message": "I have the simple transfer function of an RC filter:\\$ H(s) = \\frac{sRC}{1 + sRC} \\$In order to find the magnitude, square the previous equation and take the square root:\\$ (H(s))^2 = \\frac{(sRC)^2}{(sRC + 1)^2} ; s = j\\omega \\$\\$ (H(s))^2 = \\frac{(j\\omega R C)^2}{(j\\omega R C + 1)^2} ... | Transfer Function Magnitude, how to deal with 'j'? | electronics | 2017-11-19T23:08:38.737 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/NLE8h.png\" rel=\"nofollow noreferrer\">I got the picture from my prof's notes, and I don't quite understand why there can be two different currents at the given node. If there are only two currents shouldn't the currents' values be the same",
"role": "user"... | BJT with Zener diode | electronics | 2017-11-20T02:46:46.643 |
[
{
"message": "This so-called \"zero drift\" opamp droops .001V/sec, at temp 85C with a 1 uF cap. If I'm reading the spec correctly, that's 3.6V/hour!<a href=\"http://www.ti.com/lit/ds/symlink/lf398-n.pdf\" rel=\"nofollow noreferrer\">http://www.ti.com/lit/ds/symlink/lf398-n.pdfIs there a method to store a low c... | How to achieve analog zero-drift sample and hold for hours? | electronics | 2017-11-20T08:16:43.480 |
[
{
"message": "I have tiny christmas tree that has about 20 small LEDs, which are powered by 2 AA-batteries. So I'm assuming the LEDs are 3V (because of 2 AAs). This tree was bought in a store, as is.What I want to do, is hook up the little tree to an Arduino and control the lights with some sensors (lights, sou... | Resistors in battery-powered LED device and Arduino | electronics | 2017-11-20T09:41:14.030 |
[
{
"message": "An active filter is given as(for this question the filter can be any other filter):<a href=\"https://i.stack.imgur.com/W24CD.png\" rel=\"nofollow noreferrer\">In LTspice in time domain, I apply a step function V(in) and obtain V(out) plots as below(I skip initial op. point solution):<a href=\"http... | Obtaining Bode plots by using Laplace transform and time domain data from SPICE | electronics | 2017-11-20T11:25:41.850 |
[
{
"message": "I am having a problem as below. Hope somebody could help me out. <br/>I have a clock signal with a fixed frequency. Now I need to generate 3 control signals <code>S1</code>, <code>S2</code>, <code>S3</code> as follows:S1: turn on at rising edge of CLK and keeping on until condition 1 is met.<br/>S... | Generate digital controlling signal with some conditions | electronics | 2017-11-20T14:22:20.177 |
[
{
"message": "I'm currently helping a friend who is renovating a VW camper to fit some LED lighting as she has no electrical experience. She has a 10 metre set of <a href=\"https://www.ebay.co.uk/itm/Waterproof-LED-String-Fairy-Lights-USB-Powered-Copper-Wire-Xmas-Wedding-Party/132290935549?hash=item1ecd277afd:m... | Rewiring USB LED lights to directly use a 5V DC-DC Converter | electronics | 2017-11-20T14:40:26.543 |
[
{
"message": "At the creation of a lowpass filter, I did not account the series resistance of the the inductors. Now, of course, the simulation and measured <a href=\"https://imgur.com/gallery/R49nK\" rel=\"nofollow noreferrer\">S-Parameters do not fit.In the pictures the \"right_simul\"-graph is the simulation... | DC Resistance of Inductors | electronics | 2017-11-20T14:44:21.280 |
[
{
"message": "I'm using the following circuit to allow an ESP8266 to trigger a mains TRIAC via an optoisolator. I'm aware that there should be a resistor between the OI and the base of the TRIAC (R1 in my diagram).How do I choose the value of the resistor? It's mains in the UK, so 230V RMS. The TRIAC has a max ... | How to choose value of base protection resistor for TRIAC | electronics | 2017-11-20T19:31:44.083 |
[
{
"message": "I want to develop microcontroller projects at my home. In college, we had a device that would write the microcontroller code into the microcontroller. I was going through some of the microcontrollers kits and found <a href=\"https://www.amazon.in/MY-TechnoCare-Development-Microcontroller-Architect... | Purpose of 8051/AVR USB programmer in a micro-controller kit | electronics | 2017-11-20T19:58:57.613 |
[
{
"message": "I have a setup where I need to measure the weight at the end of an arm.<a href=\"https://i.stack.imgur.com/aD6vz.png\" rel=\"nofollow noreferrer\">The arm is clamped between two pieces of aluminum at one end.The Sensor S is mounted a short distance (5cm?) from the aluminum base. The distance from ... | How to measure weight at end of arm | electronics | 2017-11-20T20:38:28.593 |
[
{
"message": "<a href=\"https://www.vishay.com/docs/83741/83741.pdf\" rel=\"nofollow noreferrer\">https://www.vishay.com/docs/83741/83741.pdf example 2I have existing H22A2 optocouplers that I am trying to run 12vdc through to get a plc input to turn on and off. I am using a 1k resistor on the 5vdc LED. I am us... | optocoupler H22A2 driving a plc input | electronics | 2017-11-20T20:46:35.687 |
[
{
"message": "I want to use a shift-register to generate video signal directly from SRAM. And researching I found that the pixel rate of NTSC is 12.272MHz and I can't find any crystal closer to that speed than 12MHz. That also makes easy to generate the memory addresses on the memory.I want to know if modern TV... | Can I use a 12MHz for NTSC video generation | electronics | 2017-11-21T00:16:16.067 |
[
{
"message": "My board has a Li-ion battery with the capacity of 2200mAh and maximum voltage of 4.25V and minimum voltage of 3V . This means that the battery voltage shouldn't get lower than 3V. Microcontroller is powered through a low dropout 3.3v regulator.The micro should be apprised of the lowness of the ba... | Battery low voltage cut-off circuit driven by microcontroller | electronics | 2017-11-21T10:48:11.637 |
[
{
"message": "I have been newly learning digital electronics. I know that there are gates which perform logic functions, I learned about RS-Latch, D-Latch and Master-Slave-D-Flip-Flop. Now that I can perform logic functions and store states, I can create a Finite-State-Machine (for example traffic light). In cl... | Why do we need to synchronise asynchronous inputs in FSM? | electronics | 2017-11-21T11:22:57.063 |
[
{
"message": "Please forgive my ignorance, I'm a software programmer who is new to the electrical and hardware side.Our Panasonic HS300G video switcher has a Tally connector. Below is the pin diagram and circuit diagram.Pin 1-6 are for telling me which Camera input is active (Camera 1-6).Using a Raspberry Pi 3,... | Using Raspberry Pi to read open collector outputs from tally connector | electronics | 2017-11-21T16:56:47.043 |
[
{
"message": "(from <a href=\"https://www.google.co.in/imgres?imgurl=http%3A%2F%2F1.bp.blogspot.com%2F-ugfSdnhl1B8%2FVIT9F27JcqI%2FAAAAAAAAFLs%2FDnNAhCtOdRI%2Fs1600%2F3.bmp&imgrefurl=http%3A%2F%2Fthefragmentationparadox.blogspot.com%2F2014%2F12%2Fsram-memories.html&docid=QX0MqngzRY5xaM&tbnid=ntk20th... | How does the Pre-charge and Equalizing circuit shown in the below figure work? | electronics | 2017-11-21T18:29:40.760 |
[
{
"message": "I am trying to create home made battery saver circuit to powering on my microcontroller (nodemcu v2),I am following <a href=\"http://www.ti.com/product/TPL5111/datasheet/detailed_description\" rel=\"nofollow noreferrer\">http://www.ti.com/product/TPL5111/datasheet/detailed_description, and created... | Powering micro controller using n-channel mosfet and tpl5111 | electronics | 2017-11-22T03:13:29.333 |
[
{
"message": "After having spent 4 hours to hot air solder, multimeter probe, apply flux around the sort circuiting pads, re- hot air, re- probe and finally apply wick & iron to get rid of those shorts I am now concerned with possibly having overwicked them. Can't tell for sure if there is pin to pad connec... | testing no leads packages for pin to PCB pad connectivity | electronics | 2017-11-22T10:20:53.827 |
[
{
"message": "Tried all over internet...but not found what it is.Any help appreciated. <a href=\"https://i.stack.imgur.com/rTL1R.jpg\" rel=\"nofollow noreferrer\">",
"role": "user"
},
{
"message": "It might be FDC655AN MOSFET (obsolete) - replaced by FDC655BN (datasheet: <a href=\"http://www.onsemi.... | SMD identification | electronics | 2017-11-22T13:27:24.660 |
[
{
"message": "I'm on a (very) long and arduous journey to build a RF sweep generator for tuned circuit filters. After much experimentation with free running LC oscillators, I conclude that for this application (and keeping things analogue), some form of AGC to control the amplitude is key. This is the context... | What is the purpose of this RF sweep oscillator circuit section | electronics | 2017-11-22T14:06:17.473 |
[
{
"message": "I have many files consisting input and output voltage signals for a linear filter circuit. For each file the input and output signal is at different constant frequency. All sampled for 2 sec duration with a sampling rate Fs. So basically by using a function generation each time I applied sinusoida... | Extracting phase-shift and gain from a time series information | electronics | 2017-11-22T16:11:53.447 |
[
{
"message": "My electric fence zap box surrounding my bee yard stopped working. When I took the box apart I noticed a burnt spot on this capacitor. The only numbers I can see on this part is E 103M AKV. What does this label mean? Thanks for the help in advance.<a href=\"https://i.stack.imgur.com/CF1PO.jpg\" r... | Capacitor ID & Where to Purchase | electronics | 2017-11-22T18:09:57.267 |
[
{
"message": "I have to make a pulse generator square wave for ultrasonic transducer with frequency 1 MHz and 70V for the amplitude, the input is function signal generator with 10V VPP output and 1 MHz. I have made it and it works, but there is a problem. There is always a ringing or overshoot in turn on or ris... | How to remove turn on ringing/overshoot in MOSFET output for 1 MHz and 70V Switching? | electronics | 2017-11-23T05:34:02.467 |
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