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 2 studio monitors (i.e., \"speakers\") and one subwoofer, all having 120v amplifiers built in. There is no voltage switch on them, and of course there are no \"user serviceable parts\". Is there a way to replace the power supplies with 240v units? The manufacturer says they will not do it f... | Can the power supply be replaced on these powered audio speakers? | electronics | 2017-10-19T23:24:58.507 |
[
{
"message": "I'm trying to figure out how to VHDL, and am having some difficulties writing a simple flip flop. I want a T flip flop that runs strictly off of the clock, changing state every time it receives a rising edge.The syntax errors are somewhat cryptic and I'm having difficulty figuring out what is wron... | VHDL Flip Flop Syntax Error | electronics | 2017-10-20T06:02:15.393 |
[
{
"message": "I have a WiFi enabled AC mains light dimmer/switch that uses a back to back MOSFET design. The device sits in series with the load (lightbulb) and therefore does not have its own return/neutral connection.I'd like some help to understand how its MOSFET / transistor arrangement works as I'm not ful... | How should I modify this back to back MOSFET AC mains circuit? | electronics | 2017-10-20T06:42:43.507 |
[
{
"message": "How will the rated speed of two dc motors(bldc) compare if they have different output power rating but have same input voltage rating? Goal is to select a motor of appropriate rated output power which gives good rpm(speed is of importance) minimising discharge current from the battery source for t... | Comparing motors with different output rating but same voltage rating | electronics | 2017-10-21T01:50:54.137 |
[
{
"message": "I spent some time already and I think I forget about something in my problem.I have a motor, which single phase is R17 = 2 Ohm. I want to measure a current through it's circuit. I used a shunt with R11 = 5 mOhm. I measure voltages before and after the shunt, so I get the circuit:<a href=\"https://... | Currect measure through ADC and shunt | electronics | 2017-10-21T11:53:28.927 |
[
{
"message": "I'm struggling with the following circuit trying, using kirchhoff laws, to write equations system that solve all variables.<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fzTZkB.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" ... | kirchhoff laws with current source connected in series to resistor | electronics | 2017-10-21T17:11:59.970 |
[
{
"message": "We were taught about single phase series circuits today and I had a bit of a problem understand this little thing. Let's look at this case1) purely capacitive circuitIt's said that current leads the voltage by an angle of 90°. So at t= 0 voltage is zero, but current is non zero. I cannot imagine t... | How can voltage be zero when current is non zero? (Single phase series circuits) | electronics | 2017-10-21T17:36:50.863 |
[
{
"message": "I am trying to build a Wien Bridge Oscillator in Multisim that has a frequency of 500kHz. I went through all of the necessary calculations to choose values for R and C. When I build the circuit in Multisim it says I have a frequency of 25 kHz and the oscilloscope does not show any oscillations, ju... | Wien Bridge Oscillator in Multisim | electronics | 2017-10-21T20:29:19.370 |
[
{
"message": "Apologies if this is the wrong exchange.I would like to start a home project, in which screw-in bulbs are left mostly exposed, and connected to semi-flexible wire. Something similar to <a href=\"https://www.ingo-maurer.com/en/products/birds-birds-birds\" rel=\"nofollow noreferrer\">this: <a href=\... | Exposed bulb/wiring project | electronics | 2017-10-21T23:41:16.080 |
[
{
"message": "Supposing I have been given three two bit numbers, a1a0,b1b0,c1c0 then what is the best way to design a circuit that gets the largest two of the three and adds them?",
"role": "user"
},
{
"message": "We can either look for the two largest, or we can look for the one smallest and sum th... | Comparing and adding numbers using multiplexers and comparators | electronics | 2017-10-21T23:50:12.360 |
[
{
"message": "Some of you may have read my answer <a href=\"https://electronics.stackexchange.com/a/335359/139766\">here to detect when two digital signals are either high or low, i.e. not both tri-state.One method uses window comparators the other opto-couplers to detect when the line is actually driven. The ... | Tri-State Detection | electronics | 2017-10-22T00:34:55.540 |
[
{
"message": "What happens to voltmeter reading when we increase R' (The rheostat)?<a href=\"https://i.stack.imgur.com/1s1v4.jpg\" rel=\"nofollow noreferrer\">",
"role": "user"
},
{
"message": "This is only a hint: Redraw the circuit in the conventional manner, battery on the left with positive on t... | What happens to the voltmeter | electronics | 2017-10-22T16:47:34.053 |
[
{
"message": "I’m seeking to find/design a battery that can power a 230 kW electric motor at 680V for atleast 10 seconds. I don’t know much about battery mechanics besides simple circuit equations, so I’m seeking general advice on how to go about finding/designing a battery for my use case, and how to calculate... | Battery Pack for Electric motor | electronics | 2017-10-22T17:48:44.250 |
[
{
"message": "I’m from Cape Town. My daughter is doing a geothermal energy power plant for her science project and we are battling to get the turbine with the DC motor to spin when steam hits it. The Dc motor is not loose enough so won’t turn to generate electricity to our small LED light. Please can you help. ... | Kid's geothermal power plant science project | electronics | 2017-10-22T22:16:56.250 |
[
{
"message": "If I have an input signal, \\$v_{in} = A\\sin(2 \\pi ft)\\$ where 1 < A < 4V and 20 < f < 20 kHz, and I am wanting to double the signal's amplitude so that my output then becomes \\$v_{out} = 2A\\sin(2 \\pi ft + \\theta)\\$, where I desire to keep the phase shift (theta) as low as poss... | How to double the amplitude of an AC Signal | electronics | 2017-10-22T22:32:32.920 |
[
{
"message": "I was working on some simulations in logistic map in MATLAB, and need to verify some results in a virtual circuit of a logistic map. I found this circuit diagram for the logistic map.<a href=\"https://i.stack.imgur.com/dpvAT.jpg\" rel=\"nofollow noreferrer\">However, I am having some trouble findi... | Part name in Pspice | electronics | 2017-10-23T15:03:51.877 |
[
{
"message": "I'm a freshman computer science major, and I still have a lot left to learn in the realm of circuitry, but I have a decent understanding of the fundamentals.I have made an electric bike, and I wanted to install turn signals. The bike's battery is a 52 volt nominal, Lithium Ion battery (max 58 volt... | Solid State Flasher controlling other Relays | electronics | 2017-10-23T17:40:18.617 |
[
{
"message": "Hello I'm working on Android App that can read data from CAN bus. The interface I'm using is ELM327. The problem is that this interface uses Bluetooth. So I cannot read all the data from CAN bus because after half of the sec the buffer is full. The the interface is v. 1.4.7. And I am using Bluetoo... | How to set timeout using AT commands and ELM327 | electronics | 2017-10-23T18:16:25.820 |
[
{
"message": "In the beginning I would just like to mention I don't have too much experience with electronics and English isn't my native language. I would like to use a <a href=\"https://rads.stackoverflow.com/amzn/click/B00WSN98DC\" rel=\"nofollow noreferrer\">BTS7960 module with Arduino <a href=\"https://www... | Power supply for BTS7960 | electronics | 2017-10-24T08:08:42.753 |
[
{
"message": "I have a simple op-amp circuit (picture) designed to drive a capacitive load (~1nF) with a variable ac voltage up to 40Vpp and variable frequency up to 150kHz. The circuit takes signal from a function generator, amplifies it with a gain of 2, and passes it to the load. The op-amp used is an <a hre... | Limiting current in an ac op-amp circuit | electronics | 2017-10-24T09:57:03.247 |
[
{
"message": "Can anyone draw (or write in text) the small-signal path from signal source XFG1 at input of Q1 base to amplifier load for positive and negative input signal swing?<a href=\"https://i.stack.imgur.com/GD0hi.png\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/Jun1K.png\" rel=\"nofo... | Power amplifier input source current path | electronics | 2017-10-24T16:06:38.043 |
[
{
"message": "I'm using two Xilinx FPGAs (one Kintex 7 and one Artix 7). The Kintex 7 is tied to its own system (OPAL-RT software, it is a simulation software that is an addon to Simulink which lets data be output to an FPGA via a user CPU input) and will be outputting the its data as 10 serial bits.The proble... | How to implement 8b10b en/decoding protocol between two FPGAs? | electronics | 2017-10-24T16:44:24.810 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/NziXW.gif\" rel=\"nofollow noreferrer\">Source: <a href=\"http://www.electronics-tutorials.ws/opamp/opamp35.gif\" rel=\"nofollow noreferrer\">http://www.electronics-tutorials.ws/opamp/opamp35.gifThis is an OpAmp differentiator circuit. Output is the derivative o... | Integrator Circuit using Op-Amp Differentiator | electronics | 2017-10-24T17:29:47.623 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/QDp6j.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/yBDqh.jpg\" rel=\"nofollow noreferrer\">I am very interested in this project: <a href=\"https://electronics.stackexchange.com/questions/305685/sonar-hc-sr04-analog-output-multipoint-sona... | Analog Signal HC SR04 | electronics | 2017-10-24T17:57:45.420 |
[
{
"message": "I am looking for a way to have LTSpice report a \"Pass\" or \"Fail\" (\"1\" or \"0\") in the error log if a measured voltage drops below a preset constant reference value. I have a model I made of a transmission line and I would like LTSpice to be able to identify when the amplitude of the signal... | LTSpice: Pass/Fail in Error Log if Voltage < Constant Reference | electronics | 2017-10-24T18:47:36.703 |
[
{
"message": "I have an analog circuit which has an offset error as well as an gain error.I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor <code>k_gain_comp</code> and the offset by an additive value <code>offset_comp</code>.What is the righ... | How to compensate gain and offset errors | electronics | 2017-10-25T09:05:51.467 |
[
{
"message": "In the image...Q1,Q2 - p channel mosfet (IXTH11P50)Q3, Q4,Q5 - n channel mosfet (IRFP460N)The problem I faced here was...when I test the circuit with 12 volt dc supply, and my load is two leds, it works very fine...When i connect my supply voltage to 300 volts dc with lamp load and when I just t... | What is the fault with my hbdridge design in the below circuit using pchanel and n chanel mosfets? | electronics | 2017-10-25T12:58:11.967 |
[
{
"message": "I have a 555 timer set up so each cycle it will count up a 7 segment display. clock output of 555 goes to a <a href=\"http://www.ti.com/lit/ds/symlink/cd4026b.pdf\" rel=\"nofollow noreferrer\">CD4026B clock input , this feeds the 7 seg display. I would like when the 7-segment display reads 9 9 th... | How to stop a 555 timer | electronics | 2017-10-25T17:22:18.447 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/JQlJ2.jpg\" rel=\"nofollow noreferrer\">In the solution they have given like this <a href=\"https://i.stack.imgur.com/df93c.jpg\" rel=\"nofollow noreferrer\">Here I did't get how they directly wrote DC gain 1? I solved like this\\$GM=\\frac{1}{\\left |G(s)\\righ... | DC gain from Nyquist Plot | electronics | 2017-10-26T06:31:10.750 |
[
{
"message": "My system activates when a thrown switch turns on a DC motor with an 8 hole optical wheel on its shaft. A photo emitter / detector is used to generate pulses sent to three negative edge T flip flops in order to generate 3 bit binary counter (B2, B1, B0). The switch signal and B2 are run through an... | Single rotation DC motor using 3 bit binary counter | electronics | 2017-10-26T08:41:31.223 |
[
{
"message": "I'm back with my basic questions.I'm trying to answer some questions, using Thevenin, for this circuit:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fx5sPI.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">Cir... | Thevenin \$V_{th}\$ calculation problem | electronics | 2017-10-26T08:41:36.750 |
[
{
"message": "The example below is for a perfect lossless circuit with no resistance for the sake of illustration only. In reality this does not exist, but again the purpose is for simplicity.If there is 1 Joule of energy stored in a capacitor and then that capacitor is connected to a coil to transfer and then ... | Is Work done to Transfer Energy? | electronics | 2017-10-26T15:43:37.243 |
[
{
"message": "Following is the circuit I am working with.<a href=\"https://i.stack.imgur.com/J59gl.jpg\" rel=\"nofollow noreferrer\">Intended output across R7 is (60 Ohm resistor) is:More than 2 mA current for logic high (5 V) input V1Less than 0.1 mA for logic low (0 V) input V1Another key point is, output sh... | How can remove the spikes in common mode rail? | electronics | 2017-10-26T15:59:34.293 |
[
{
"message": "If we consider a single NMOS transistor (with its source terminal grounded) and a Miller cap (C) between its input (gate) and output (drain) nodes, circuit theory says that this Miller cap will be responsible for a pole. If there is conductance G at the input of the NMOS, then the pole at the inpu... | How does a Miller cap physically create a pole in circuits? | electronics | 2017-10-26T17:13:40.130 |
[
{
"message": "I am working with a CLICK PLC with the <a href=\"https://cdn.automationdirect.com/static/specs/c008na.pdf\" rel=\"nofollow noreferrer\">C0-08NA 120VAC input module.According to the documentation, the C0-08NA's equivalent input circuit looks like this:<a href=\"https://i.stack.imgur.com/goIKS.png\"... | How can I use half-wave rectified 120VAC to activate a PLC input? | electronics | 2017-10-26T17:59:19.117 |
[
{
"message": "I am trying to build a system where a switch toggle (up then down) will cause a dc motor to do one full rotation and stop until the switch is flipped again. The only other input allowed is a hard reset button. This is an analog circuit on a breadboard. I have rebuilt the same system about 5-10 tim... | DC motor single rotation using Photodiode-transistor | electronics | 2017-10-26T20:46:36.757 |
[
{
"message": "I am trying to build a system where a switch toggle (up then down) will cause a dc motor to do one full rotation and stop until the switch is flipped again. The only other input allowed is a hard reset button. This is an analog circuit on a breadboard. I have rebuilt the same system about 5-10 tim... | DC motor single rotation using Photodiode-transistor | electronics | 2017-10-26T20:46:36.757 |
[
{
"message": "I am trying to hook up a 9V battery to a 6V DC motor on a breadboard. The circuit on the breadboard has a 5V supply. Is the attached schematic correct in applying a 2/3 voltage drop from the battery to run the motor? I have the 1K resistor and emitter wired together and going to the breadboard gro... | DC motor voltage divider with NPN, diode, capacitor, and separate battery | electronics | 2017-10-27T05:15:44.520 |
[
{
"message": "I have a soldering station which came with a 3.5mm jack socket and a power prong as in the following photo:<a href=\"https://i.stack.imgur.com/rzvss.png\" rel=\"nofollow noreferrer\">The manual only mentions the following about the usage for the 3.5mm jack in their manual as:<a href=\"https://i.st... | Bonding in a soldering station | electronics | 2017-10-27T10:22:35.767 |
[
{
"message": "The base of my transistor is activated with a positive signal 5v. I need that when this happens my output OUT receives GND, but I do not know if I should connect OUT on the collector and GND on the emitter or the opposite GND on the collector and OUT on the emitter. Usually my output is connected ... | Output receiving GND by activating the transistor | electronics | 2017-10-27T10:33:02.337 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/f6OKO.png\" rel=\"nofollow noreferrer\">I need to find the voltage Vi for Q3 saturatedwith B = 100 for transistors. I did the calculations and then simulated the circuit and i had similar results. the Question is: the analysis is right ?My calculations: If Q3 is... | Voltage for transistors in saturation | electronics | 2017-10-27T13:21:16.947 |
[
{
"message": "I'm building an electronic DC dummy load and have a problem with stability/oscillations. This is my circuit:<br><a href=\"https://i.stack.imgur.com/lgQ0f.png\" rel=\"nofollow noreferrer\">Vset - controls current, when set to 100mV it makes 500mA at the shunt<br>Vout1 - Vshunt multiplied by 40 by ... | AC analysis of opamp loop in LTspice | electronics | 2017-10-27T13:58:49.090 |
[
{
"message": "I'd like to use a potentiometer (with a value like 1kOhm) in a resistor network to achieve a close to linear variation between 35 and 250 Ohm. I've tried several configurations, but I'm having a hard time finding a possible configuration.I've tried the following circuit:<a href=\"https://i.stack.i... | Vary equivalent resistor linearly between two values | electronics | 2017-10-27T15:49:14.787 |
[
{
"message": "I'm trying to create a air pump system with a rechargeable battery pack. My question is:Because my air pump is a positive desplacement pump, which task is to create a vacuum in a container, will its voltage increase above 12V when the workload increase (because vacuum) and will I need a overvoltag... | 12V DC Overvoltage Protection | electronics | 2017-10-27T17:41:23.070 |
[
{
"message": "I have been taught that current flows in a closed loop back to the source. And with electrical distribution, current flows to ground because the whole grid is effectively grounded back to the source. Therefore if you were to touch a hot lead, current will flow from your hand through you body and o... | Does electricity always flow in a closed loop and why does current flow to ground? | electronics | 2017-10-28T05:23:32.317 |
[
{
"message": "This is a circuit I made recently; a differential bjt amplifier (without any signal, only DC).So I was trying to see, what happens when I change the voltage difference between the base of Q1 and base of Q2. Q3 represents constant current source.According to the example shown here: <a href=\"https:... | Differential Amplifier BJT Experimenting | electronics | 2017-10-28T12:08:37.870 |
[
{
"message": "How to turn an SPST momentary push button into a DPDT? I would like to close 2 circuits at the same time. (From comments: I want to ground the reset circuit while getting a pin to HIGH on an Arduino like board.)SPST <a href=\"https://i.stack.imgur.com/NUKj3.gif\" rel=\"nofollow noreferrer\">DPDT <... | How to turn an SPST momentary push button into a momentary DPDT? | electronics | 2017-10-28T22:02:10.930 |
[
{
"message": "So basically I'm trying to make a circuit for a piezo-electric actuator. I only have access to a single supply at +70V for my op amp, an OPA445AP. Vin varies between 0 and +3V. I've looked at the help given by TI in <a href=\"https://www.ti.com/lit/an/sloa030a/sloa030a.pdf\" rel=\"nofollow norefer... | Single supply OPA445? | electronics | 2017-10-28T22:54:48.890 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/4YgCp.jpg\" rel=\"nofollow noreferrer\">Hi,I'm studying op amp and it feedback to control the gain. I do not understand how we can go from looking at the circuit of the op amp and determine the beta values. How did the term B (beta) equal to the voltage divider ... | Op Amp & Feedback | electronics | 2017-10-29T00:51:08.590 |
[
{
"message": "I was reading a paper from 1977 regarding the analysis for the CMRR of a three opamp instrumentation amplifier, I got the paper through my Unviersity but I cant post the paper since its copyrighted, however here is the link to download it legally through IEEE Xplore: <a href=\"http://ieeexplore.ie... | How can the CMRR of an opamp be negative? | electronics | 2017-10-29T03:55:44.020 |
[
{
"message": "I need a current source, that can work in both directions.To make it simple, I need to generate a square signal in current.I am currently using a simple H-bridge, but without any current regulation. All the current regulators that I found don't work for both negative and positive parts.voltage ran... | Reversible Constant Current Source (CCS) | electronics | 2017-10-29T18:36:18.603 |
[
{
"message": "I’m working on a low power sensor and would like to measure its battery voltage.The battery voltage is too high my ADC input so I have been dividing it with a pair of 1M resistors and a 100n cap so that the ADC’s input capacitance doesn’t load it too much while sampling and affect the results.The ... | Low current divider for battery voltage monitoring | electronics | 2017-10-30T07:03:22.677 |
[
{
"message": "I'm working on a project where I'm building a custom NFC antenna that will be connected to a PN532 NFC controller. The antenna has already been designed (for 13.56 MHz) and built, the PN532 is also here, what's missing is the matching network between transceiver and antenna.Problem now is, the ham... | "Antenna matching networks for dummies"? | electronics | 2017-10-30T09:06:21.693 |
[
{
"message": "<blockquote> A cascade control system with proportional controller is shown below </blockquote><blockquote> Theroritically the largest values of the gain K1,and K2 that can be set withot causing instability of the closed loop sytem are Given \\$G1=\\frac{1}{(s+1)(2s+1)}\\$ and \\$G_2=\\fra... | Find the largest value of \$K_1\$ and \$K_2\$ for instability of the system | electronics | 2017-10-30T12:15:30.560 |
[
{
"message": "I've been tinkering with switch mode power supplies recently and it seems there are various types of buck controller IC's some with a 'COMP' pin for frequency compensation and some without, and I was wondering what the major trade offs are to having or not having this input? I know that well desig... | Frequency Compensation Necessary for a Buck Converter? | electronics | 2017-10-30T14:54:16.247 |
[
{
"message": "I found this schematic for a water level indicator:<a href=\"http://bp3.blogger.com/_IrQ3pWfzbLQ/R4-mFFQO4eI/AAAAAAAAAHI/H0NESRgTo0w/s1600-h/depth+sensor.jpg\" rel=\"nofollow noreferrer\" title=\"sensor schematic\">sensor schematicI would like to modify it some. Namely, instead of illuminating LE... | variable voltage divider using transistors | electronics | 2017-10-30T15:49:38.280 |
[
{
"message": "I found this schematic for a water level indicator:<a href=\"http://bp3.blogger.com/_IrQ3pWfzbLQ/R4-mFFQO4eI/AAAAAAAAAHI/H0NESRgTo0w/s1600-h/depth+sensor.jpg\" rel=\"nofollow noreferrer\" title=\"sensor schematic\">sensor schematicI would like to modify it some. Namely, instead of illuminating LE... | variable voltage divider using transistors | electronics | 2017-10-30T15:49:38.280 |
[
{
"message": "I have searched high and low (in fact I have spent the recent months on and off trying to find an answer). Maybe I'm not asking the right questions, or am staring the answer in the face, I'm not sure. I have been too nervous to ask, but I am at my wits end, so here goes.I am creating a project tha... | Is SWD with an FTDI chip a universal programmer solution? | electronics | 2017-10-31T04:22:46.187 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/S26sY.jpg\" rel=\"nofollow noreferrer\">A. In the circuit in the figure, the thermistor resistance is 50 kΩ. What is the absolute value of the gate voltage (voltage at node G) versus ground?B. How does your result change if the thermistor resistance decreases an... | Electrical Engineering Prelab - Absolute value of gate voltage | electronics | 2017-10-31T04:30:20.813 |
[
{
"message": "I'm reading Art of Electronics, and in the section Transistor Current Source, they mention \"The base voltage can be provided a number of ways. A voltage divider is OK as long as it is stiff enough. As before, the criterion is that its impedance should be much less than the DC impedance looking in... | Transistor Current Source Biasing | electronics | 2017-10-31T08:01:28.353 |
[
{
"message": "In my MATLAB/SIMULINK model of the PMDC motor the mechanical time constant has same value in the case starting of motor and after switching off the supply but in experimental setup there is a difference?I have taken many experimental readings, in which starting mechanical time constant is around ... | Mechanical time constant of PMDC Motor in starting and after switching off the supply is same or different? | electronics | 2017-10-31T12:06:32.907 |
[
{
"message": "I'm routing a differential pair (rs485), and I'm wondering if I should avoid routing it above a power plane split. I read about the undesired effects that a ground plane split can have over those signals, but I'm unsure if this also applies on a power plane. <a href=\"https://i.stack.imgur.com/TcP... | Power planes splits effect on differential pairs routing | electronics | 2017-10-31T14:55:42.783 |
[
{
"message": "The question is more about the DC-DC converter and baud rate between two separate logic level UART devices.My master device operates at a 3.3v logic level, while my slave operates at a 1.8v logic level. My proposed solution to allow communication between the two devices is to pull down the tx line... | Serial communication between two devices with seperate logic levels | electronics | 2017-10-31T19:13:09.460 |
[
{
"message": "Today my 48v 15Ah LiFePO4 ebike battery fell off from my bicycle and got a little bit of road rash on the corner:<a href=\"https://i.stack.imgur.com/tDrO1.jpg\" rel=\"nofollow noreferrer\" title=\"Oops!\">It still works. Does not seem to be heating or discharging on its own.However, between batte... | Battery pack a little bit damaged. Should I throw it out or repair? | electronics | 2017-11-01T05:37:19.050 |
[
{
"message": "The part of the circuit I'm having trouble implementing is the transistor pair that are used to control the output frequency (going into pin 11 of the 4046).<a href=\"https://i.stack.imgur.com/1pey1.jpg\" rel=\"nofollow noreferrer\">I have removed the Exp FM, Linear FM, hard sync, 1V/Oct and sine ... | Is it possible to replicate the Thomas Henry X-4046 circuit using the PLL_Virtual component in Multisim? | electronics | 2017-11-01T09:42:30.733 |
[
{
"message": "I have a few doubts regarding the driver LM5113 (and IC's in general at this point). As can be seen in the schematic below, VDD is provided with 5.1V via the Zener Diode. I was told (with no further information) that, the chosen resistor (R50 = 787 Ohms) value is too high, and the LM5113 would \"n... | Question regarding LM5113 Driver | electronics | 2017-11-01T11:46:33.293 |
[
{
"message": "I want to operate LED lights using either batteries or an AC/DC adapter wall plug. I have a SPDT switch but I’m not sure how to connect the two power sources to the switch. I might be using the wrong switch, if so what switch do you suggest? The main thing is that the AC power source is never conn... | How to connect two power sources to a switch? | electronics | 2017-11-01T18:31:16.487 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/Cr1uH.png\" rel=\"nofollow noreferrer\">For HB100 microwave sensor module, I don't quite understand how this amplifier works and why it's been chosen instead of something simpler, such as two inverting or non-inverting op-amps. What can see for the diagram is th... | Why is such amplifier configuration chosen for HB100 microwave sensor? | electronics | 2017-11-01T19:14:30.400 |
[
{
"message": "I'm attempting to create a circuit to test ESD foot straps (and wrist straps). Research has led me to a window comparator circuit for testing power supplies that I've used as a base for the drawing below. I have a basic awareness of Ohm's law and the concepts of calculating resistance in parallel ... | How to calculate resistor values for a Foot Strap test circuit using a window comparator? | electronics | 2017-11-01T21:32:22.617 |
[
{
"message": "I am a newbie to electronics and currently working on my very first electronics project on Atmega16.I want to make sure that no matter how high current is supplied(by mistake), it shouldn't damage my laptop.So here's what I did till now,<a href=\"https://i.stack.imgur.com/WN43i.jpg\" rel=\"nofollo... | is it possible to protect workstation by removing VCC connection from workstation to circuit? | electronics | 2017-11-02T04:59:38.350 |
[
{
"message": "This is a followup to my previous question: <a href=\"https://electronics.stackexchange.com/q/337487/11683\">A capacitor stores half the energy when charged from a battery each and every time?This is a real world circuit with losses. The losses are in the resistance of the battery, the switch, the... | How much Energy is Stored in this Capacitor? | electronics | 2017-11-02T16:35:30.430 |
[
{
"message": "So I designed this Half-Bridge Mosfet Driver for 48V.Since I'm pretty new to this type of circuit I would like to ask if there are going to be any problems with this circuit. (eg. speed, power loss, voltage limit)The target frequency is going to be at about 60KHz, PWM modulated and 2 of those circ... | Half-Bridge MOSFET Driver for 48V | electronics | 2017-11-02T16:42:24.740 |
[
{
"message": "I have the circuit below, where D and Q are input and output pins (respectively) of a 74373 octal D-type transparent-latch IC. As I vary the pot from 0-10k when D is high, the voltage goes high and changes only very little with the varying pot (\\$ \\Delta V=0.97\\$). Why does the pot only affect ... | Why does the potentiometer have no effect on the output voltage here? | electronics | 2017-11-02T18:28:07.660 |
[
{
"message": "I am not an engineer. I have researched basic information that can be found on optocouplers. I understand the theory of 4 pin optocouplers. I believe I even understand basics of 6 pin optocouplers. However, everything I have located about 6N137 or 8 pin optocouplers in general, assumes I under... | 6N137 Optocoupler Pin Configuration | electronics | 2017-11-02T21:56:32.700 |
[
{
"message": "I want to obtain the inductance value from a coil. To do so i'm using a basic RL circuit as follows. The function generator has a 50 Ω internal resistance and the coil resistance is 87 Ω. The coil has a small sticker with it's value (6,24 mH) supposedly provided by the manufacturer. I would like t... | Coil inductance measurement | electronics | 2017-11-02T21:58:10.880 |
[
{
"message": "When I try to draw a line in the Keep-Out Layer in Altium by clicking the tab for the Keep-Out Layer and placing a line, the layer suddenly changes to a different one and prevents me from adding to the Keep-Out Layer. Additionally, when I try to place a line and press the Tab key and try to select... | Altium Keep-Out Layer Locked | electronics | 2017-11-02T23:10:13.280 |
[
{
"message": "We have a project with a machine servicing a car parked next to it. It's comparable to a car washning machine.Before the machine is started, we need to be 100% sure that the engine is off. Also, if we detect that the engine is turned on during the process (which takes severa minutes), the machine ... | How to detect if a nearby parked car has started engine? | electronics | 2017-11-02T23:26:42.413 |
[
{
"message": "We have a project with a machine servicing a car parked next to it. It's comparable to a car washning machine.Before the machine is started, we need to be 100% sure that the engine is off. Also, if we detect that the engine is turned on during the process (which takes severa minutes), the machine ... | How to detect if a nearby parked car has started engine? | electronics | 2017-11-02T23:26:42.413 |
[
{
"message": "I am trying to control a 3 phase brushless dc motor with integrated hall-effect sensors. I understand how to do this with your typical open-collector hall effects, however according to the manufacturer these are \"line-driver\" hall effect sensors. I do not understand how to read them. Instead o... | Reading output from "line-driver" hall-effect sensor | electronics | 2017-11-03T14:31:53.990 |
[
{
"message": "This is one of those things that I have always had a really hard time wrapping my head around.In the horrendously simplified ideal step-up SMPS model below, I have set it up so when at 50% duty cycle, the output voltage is double the input voltage. For the sake of easy math, the current in the ind... | SMPS Efficiency Paradox | electronics | 2017-11-03T15:34:17.447 |
[
{
"message": "How can I calculate the slew rate and bandwidth of a typical transistor amplifier such as the following? What are the parameters I need to consider?<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fJwWJU.png\">simulate this circuit – Schematic created using <a href=\"https... | Slew Rate and Bandwidth of Transistor Amplifier | electronics | 2017-11-03T16:32:59.990 |
[
{
"message": "I notice that there seem to be relatively few seismic intrusion detection systems available as pre-packaged products, so I am wondering about the feasibility of hacking one up.Is it as simple as buying a set of \"seismic sensors\" (whatever that is) and connecting them via coax to something, a sei... | Seismic sensors? | electronics | 2017-11-03T17:19:49.873 |
[
{
"message": "1) For table 1 of <a href=\"https://inst.eecs.berkeley.edu/~cs150/sp10/Collections/Papers/ClockCrossing.pdf#page=2\" rel=\"nofollow noreferrer\">Berkeley paper , why \"Input must be valid for at least two clock periods in the new domain.\" ? The explanation: <blockquote> the width of the input pu... | Simple questions about synchronizer | electronics | 2017-11-03T20:08:48.157 |
[
{
"message": "I am trying to determine the battery I would need to power the following:Jetson TX1 board whose website says that its power rating is 6.5-15W, 5.5-19.6V The board powers a ZED camera with 5V/380mA ratingVLP-16 lidar with 8W typical and 9-18V operating voltageMultisense camera 7W nominal power, 24-... | Battery and voltage connections | electronics | 2017-11-03T20:35:37.863 |
[
{
"message": "How I can correct my schematic to properly set the current source in the emitter of BJT common emitter stage? I can't understand how to properly bias the Q1 using R3/R4 voltage divider. How to find values of that resistors if unpredictable resistance of current source exists in emitter of Q1. It s... | BJT one stage amplifier with current source | electronics | 2017-11-04T08:20:54.603 |
[
{
"message": "I'm trying to use the output of the following transistor circuit as an input for XOR gate. It doesn't seem to work, I'm out of ideas. Any help would be appreciated.",
"role": "user"
},
{
"message": "You have the lower input of your XOR gate tied to ground so it will never switch. (You ... | Using transistor output as a logic input | electronics | 2017-11-04T11:01:38.843 |
[
{
"message": "I'm designing an Atmega328P-AU based WiFi development board for my school project, and as you know, crystal oscillators may take some effort to layout, especially when we have a WiFi module. I've been reading <a href=\"http://www.atmel.com/Images/Atmel-8128-Best-Practices-for-the-PCB-Layout-of-Osc... | How good is this crystal oscillator design? | electronics | 2017-11-04T12:11:33.723 |
[
{
"message": "What is the purpose of the 1 microfarad capacitor in this circuit? The source webpage says:<blockquote> Output of TSOP1738 oscillates at the rate of 38KHz, which is applied to clock pulse of 4017. So we have connected a 1uF capacitor across the output of the TSOP so that this 38KHz pulse train is... | Purpose of 1 microfarad capacitor in IR receiver circuit | electronics | 2017-11-04T18:46:53.093 |
[
{
"message": "Are the following circuit parts (self made, not useful, and assuming there is more on each open side, just to make it a simple question) equal? I mean, does it matter if all connected items change order?I heard that for correction capacitors the location should be close to GND and VCC of the IC to... | Order of electrical parts relative to interconnections | electronics | 2017-11-04T19:59:36.917 |
[
{
"message": "I have basic understanding of FETs and studied Integrated electronics course at college. I want to calculate delay time in H bridge circuit. Any links or tutorials or if any one can explain?This is the H-bridge I have in mind: <a href=\"https://i.stack.imgur.com/AaNtS.png\" rel=\"nofollow noreferr... | H bridge delay calculation | electronics | 2017-11-04T20:18:25.550 |
[
{
"message": "Would some kind soul review the design of my circuit? I have a couple of design challenges. I'm using a ATtiny85 with a voltage range of 5.5 V to blink a <a href=\"http://www.bivar.com/Portals/0/Products/d.ashx?f=/Portals/0/products/SM1206UV-395-IL.pdf\" rel=\"nofollow noreferrer\">UV LED with a f... | Circuit design review - battery powered attiny with Zener voltage regulator | electronics | 2017-11-04T23:42:30.857 |
[
{
"message": "From the first picture , the output and input should be the same,and as i see in the second picture,there is a offset voltage about 17mV.I surf the internet and realize that i have to add a high pass filter,as shown the third picture,but the offset voltage only become from 17mV to 10mV,i try to de... | High pass filter for a Voltage Follower | electronics | 2017-11-05T01:46:01.487 |
[
{
"message": "Referring to the link <a href=\"http://www.analog.com/media/en/technical-documentation/data-sheets/AD2S90.pdf\" rel=\"nofollow noreferrer\">http://www.analog.com/media/en/technical-documentation/data-sheets/AD2S90.pdf page no 9 states that RDC chip implements a type2 servo loop and the compensatio... | understanding compensator's transfer function | electronics | 2017-11-05T02:32:19.537 |
[
{
"message": "My book says \"Because of many possible modes and options of SDRAM, designing a comprehensiveand robust SDRAM controller is an involved and tedious task\". Don't SDR SDRAMs follow some specific standard like all things in the technology world? Why then is does it explicitly say that it is a tediou... | Is designing SDR SDRAM controller a difficult task? | electronics | 2017-11-05T17:16:51.217 |
[
{
"message": "Do I need a flyback diode for a 24 volt DC 5.4 watt coil inductive load on my PLC relay?",
"role": "user"
},
{
"message": "<blockquote> Do I need a flyback diode for a 24 volt DC 5.4 watt coil inductive load on my PLC relay?</blockquote>Yes.<blockquote> Crouzet Millennium 3. They sho... | Do I need a flyback diode | electronics | 2017-11-05T22:24:15.273 |
[
{
"message": "I'm working on a project that needs some decor lighting, the lighting need to be able to render objects, so I was thinking of building a 32x16 LED matrix with WS2812B chips, and control it with a Raspberry pi.But my concern is the response time of the chips. If I connect 512 chips to the bus, the ... | WS2812B - Response time | electronics | 2017-11-05T22:30:27.143 |
[
{
"message": "I am using an Atmega 1284 microcontroller and four 5v electromechanical relays to turn on/off appliances based on some sensors, time, etc. The ATmega has its own 5v power supply in parallel with an 8v supply that I am using for the relays. Both of these power supplies are getting their DC from the... | 5v relay causing short circuit when turned off | electronics | 2017-11-05T22:39:52.270 |
[
{
"message": "What I'm asking about is if it's possible to discharge one side of a capacitor. I've found a question about that, but I also found the answers to be a little unclear or questionable. I imagine that if you were to do so, you would need to put energy into it, because you would be removing charge f... | Discharging one side of a capacitor? | electronics | 2017-11-05T23:43:08.353 |
[
{
"message": "I have developed a product in which <code>LEDs</code> spectrum is sensed by CCD (<code>TCD1304</code>) using <code>ADC</code> of <code>pic</code> microcontrollers. It is being observed that <code>LED</code> spectrum changes with time. We concluded that it could be due to change in temperature and ... | LED Intensity variation with Temperature (At constant Forward Current)? | electronics | 2017-11-06T07:09:36.127 |
[
{
"message": "1) can someone clarify the differences between safety ground and technical ground? Why or why wouldn't we always have both? I'm thinking mostly in a North American context. 2) Are there best practices for rack grounding/bonding? I sometimes see AV equipment racks with large ground lugs bonding eac... | The difference between technical ground and safety ground? | electronics | 2017-11-06T09:59:11.687 |
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