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": "Thermal junctions between two dissimilar metals on a PCB can create voltages. How do I estimate or bound (by estimating a max voltage via a max temperature) the thermocouple effect on a pcb? Most solders don't list a number for the Seebeck coefficient. AOE does list Sn-Pb solder as 5uV/C but not l... | How to calculate\estimate thermocopule junction of a solder junction between a PCB and a component | electronics | 2018-01-05T23:55:12.880 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/vtzvs.png\" rel=\"nofollow noreferrer\">Initially, charge is shared between Source C1 and the two Co capacitors which make up Ctotal. Once charge is stabilized, the wire link is cut, forming a tiny capacitor Cm in series which is added to C total, reducing Ctota... | What happens to charge in a 3-capacitor loop when link between two capacitors is opened and closed? | electronics | 2018-01-06T07:02:44.823 |
[
{
"message": "In the following circuit, why is \\$R_o\\$ given by:\\$R_o=(R_1//R_2)+r_{o2}+g_m .r_{o2}.(R_1//R_2)\\$ ?I dont understand the \\$g_m .r_{o2}.(R_1//R_2)\\$ parcel<a href=\"https://i.stack.imgur.com/TW6NN.png\" rel=\"nofollow noreferrer\">",
"role": "user"
},
{
"message": "The output res... | Current amplifier with Mosfet and Op-Amp: Output resistance | electronics | 2018-01-06T13:58:36.860 |
[
{
"message": "So, this isn't the most serious project, more of a toy/hack, but I have a some LM2576 and LM2577 and I wanted to see if I could somehow get an adjustable dual rail (bipolar) supply out of them, for example, from V(in) = 24V DC. I know the LM2576 does inverting buck-boost but if you read the fine p... | Is there a good topology for splitting a DC power supply from a few LM2576 and LM2577? | electronics | 2018-01-06T17:57:56.237 |
[
{
"message": "I lab tested the circuit below, which Olin Lathrop designed in <a href=\"https://electronics.stackexchange.com/a/93597/101852\">this answer.The problem is, on OUT (pin 4) of the optocoupler I get 1.7 volts when 240 V is applied to the high voltage (HV) side of the circuit, I'd like the voltage on ... | Sensing 240V and converting to CMOS logic levels | electronics | 2018-01-06T19:51:22.867 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/c6mHh.jpg\" rel=\"nofollow noreferrer\">I have this switch it goes 3 ways, I am a noob and just started learning about electronics. I have a small oled Display connected to my nodemcu which is displaying information. The middle switch is off right? So I want the... | How do I wire this 3 way switch? | electronics | 2018-01-06T21:20:38.373 |
[
{
"message": "Following on from my <a href=\"https://electronics.stackexchange.com/questions/343819/usb-c-as-a-high-current-power-source/343841#343841\">previous question: The project I'm designing requires a peak current of 5V @ 6A. The average current draw will be more like 2A. The reason I'm looking into USB... | USB-C Power Delivery with a buck converter | electronics | 2018-01-07T02:09:20.863 |
[
{
"message": "I have a current source circuit with an op amp and pass transistor. The simplified schematic is this:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fyGq3f.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">Circ... | How to null op-amp offset in current source? | electronics | 2018-01-07T02:54:31.827 |
[
{
"message": "I'm using an <a href=\"https://cdn-shop.adafruit.com/datasheets/MCP3008.pdf\" rel=\"nofollow noreferrer\">MCP3008 ADC and an <a href=\"http://ww1.microchip.com/downloads/en/DeviceDoc/22060a.pdf\" rel=\"nofollow noreferrer\">MCP4131-103 (10k) digital potentiometer to try and create a sort of \"adju... | Using a digital potentiometer in a voltage divider | electronics | 2018-01-07T05:49:05.333 |
[
{
"message": "I'm using an <a href=\"https://cdn-shop.adafruit.com/datasheets/MCP3008.pdf\" rel=\"nofollow noreferrer\">MCP3008 ADC and an <a href=\"http://ww1.microchip.com/downloads/en/DeviceDoc/22060a.pdf\" rel=\"nofollow noreferrer\">MCP4131-103 (10k) digital potentiometer to try and create a sort of \"adju... | Using a digital potentiometer in a voltage divider | electronics | 2018-01-07T05:49:05.333 |
[
{
"message": "OK, I've found plenty of questions about relays where either the person wanted to have event 1 at time T trigger the relay at time T+delay (like flip a switch and have the relay energize 2 seconds later. Simple enough with a single-triggered 555 or such.) I've also found people who wanted a single... | Keep relay energized longer with capacitor | electronics | 2018-01-07T06:19:31.030 |
[
{
"message": "I have 500 resistors designed like this: That's brown, red, black, black, brown. Roughly equal spacing between all bands. 120 ohms, right? No. This is a 10k resistor: brown, black, black, red, brown.Why would they label it this way? They could easily have labeled it brown, yellow, SPACE, brown and... | How do I read these blasted five-band resistors? | electronics | 2018-01-07T11:46:58.480 |
[
{
"message": "I have designed a product (small <code>spectrometer</code>) using <code>FT234XD</code> usb-to-uart bridge and it connects to any mobile phone via <code>USB cable</code> (<code>90mA maximum current</code>). My device acts as <code>USB</code> slave and can connect to any mobile phone which supports ... | Charging a mobile Tablet while communicating with a USB device at the same time | electronics | 2018-01-07T18:02:33.820 |
[
{
"message": "I know this has been asked time and time again but bear with me as I am struggling to understand,so say I have this simple circuit here<a href=\"https://i.stack.imgur.com/77Ps4.png\" rel=\"nofollow noreferrer\">with 120v (dc for simplicity) as the input voltageand I have an led that runs on 3.4v a... | led resistor calculation, and resistor wattage? | electronics | 2018-01-07T19:55:58.643 |
[
{
"message": "I am going to build a stage box, and I need 5V for that (to add some logic, maybe even later an STM32).I also need mains (220V) for a 12W RGBW LED PAR light.At first I thought to put in the box a 'wall socket' with two 220V plugs, but since the 12W needs to be switched by a relay, only for 5V I ne... | What converter to use? | electronics | 2018-01-07T23:42:36.533 |
[
{
"message": "I'm trying to measure a material which might fluctuate between 500-100k Ohms with an ADC (e.g. an Arduino or Raspberry Pi with something like the <a href=\"https://cdn-shop.adafruit.com/datasheets/MCP3008.pdf\" rel=\"nofollow noreferrer\">MCP3008). I'm a novice with electronics, and my go to strat... | Reading dynamic resistance values over a wide range | electronics | 2018-01-08T04:38:40.677 |
[
{
"message": "I am working on a pet project that has both an SPI NOR flash (for bootloader) and eMMC (OS image).For SPI NOR I will provide a small connector to interface directly into it.Now, since I have never used eMMC in projects I do not know the best/standard approach on this.I see two options:Write initia... | How reliable is it to write eMMC before soldering it? | electronics | 2018-01-08T08:11:57.780 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/iSMy7.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/x8yDS.png\" rel=\"nofollow noreferrer\">Greetings,This is a scheme of a comparator with dynamic hysteresis.Green line is the outputRed line is the inputBlue line is the positive feedback... | Feedback capacitor in comparator circuit with an OP-AMP | electronics | 2018-01-08T20:03:34.283 |
[
{
"message": "Is there a way to have bidirectional ttl logic levels to cmos logic levels conversion in a unique IC. Because right know im trying to create a z80 computer but using a avr as a peripheral as serial port, spi, screen ..., but the z80 considers logic true to be from 2.0V (usually outputs 2.4V) and a... | Bidirectional TTL to CMOS | electronics | 2018-01-08T20:48:55.863 |
[
{
"message": "I have some questions about my project. I want to make a big electromagnet, the size is about:Outer Ring:50-70cm Height35cm DiameterInner Ring (The Movement):32cm DiameterNow: is it OK to use 1mm copper wire?How much voltage do I need for a nice movement?Must the inner ring be a whole magnet, or i... | Electromagnet Wire/Voltage/Magnets? | electronics | 2018-01-09T07:09:27.327 |
[
{
"message": "Do the devices like transistors and other semiconductors always require to be connected in the printed circuit boards the green strips and do they always require to be soldered into the board , cant we just always use wires ?",
"role": "user"
},
{
"message": "<blockquote> cant we just... | Does transistors and other semiconductors always require printed circuit boards (green ones) and soldering to connect | electronics | 2018-01-09T10:17:13.933 |
[
{
"message": "I designed a circuit for a high current linear regulator (20A peak, 16.4V (max) input regulated to 13.8V) using a <a href=\"http://ww1.microchip.com/downloads/en/DeviceDoc/mic5156.pdf\" rel=\"nofollow noreferrer\">Micrel MIC5158 together with a <a href=\"https://assets.nexperia.com/documents/data-... | How many MOSFETs can a linear controller handle? | electronics | 2018-01-09T10:52:43.107 |
[
{
"message": "I am looking for potential alternatives for my current STM32F091 uC (they currently can provide a very lousy stock).Searching through datasheets and reference manuals, I can't pinpoint where to look when I want to find NXP uC-s that have LIN protocol capability. DigiKey suggests that only MK22FN 1... | Which NXP ARM processsors have LIN capability? | electronics | 2018-01-09T13:04:23.993 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/6w0ZV.png\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/jBsoM.jpg\" rel=\"nofollow noreferrer\">I have attached my attempt and the solution provided by my instructor. I am confused on 2 thingswhat it means by \"the circuit is in quiescent sta... | Series RLC circuit problem | electronics | 2018-01-09T15:21:08.403 |
[
{
"message": "I am trying to understand an explanation written here: <a href=\"http://people.ucalgary.ca/~aknigh/vsd/ssim/vsi/co.html\" rel=\"nofollow noreferrer\">http://people.ucalgary.ca/~aknigh/vsd/ssim/vsi/co.htmlAs far as I understand:voltage V(A) is line 1 voltagevoltage V(B) is line 2 voltage... but wha... | Help me understand voltage X | electronics | 2018-01-09T21:14:06.400 |
[
{
"message": "I would like to use a single pin (tri-state buffer, 3.3V logic in case this matters) to drive two P-channel MOSFETs as high-side switches. Only one of them will be 'on' at any time. When the pin is in the high-impedance state (hi-Z), I would like both turned off. The solution I came up with is to ... | How to 'de-mux' a tri-state pin? | electronics | 2018-01-10T03:39:55.990 |
[
{
"message": "I recently bought a ADS1115 ADC to use with my raspberry pi. It's getting signal from an amplifier, and I've been seeing this strange 5.5 Hz sinusoid (as noise). <a href=\"https://i.stack.imgur.com/P2ntd.png\" rel=\"nofollow noreferrer\">As seen in the picture above, its about 5.5 Hz, roughly sinu... | Source of 5.5 Hz Noise showing up on ADC | electronics | 2018-01-10T05:39:39.497 |
[
{
"message": "I have a conundrum that I am trying to solve and am afraid I am stuck. Could anyone share some insight please? <a href=\"https://i.stack.imgur.com/Qw9F4.png\" rel=\"nofollow noreferrer\"> My circuit is displayed on image above. 5V (5Vsw) and 3.3V (3V3sw) are used as supply voltages. When Vkill is... | Discharge of capacitor bellow 0.5V | electronics | 2018-01-10T10:03:49.130 |
[
{
"message": "I 'm very new in PCB designer CAD. I have a simple PCB design in Altium which I need to create gerber and drill files before sending it to a milling machine. When I go to: Files-->Fabrication Outputs-->Gerber FilesHere I need to select one of the formats from 2:3, 2:4, 2:5 as below:<a href=\"https... | Setting number format for PCB fabrication in Altium | electronics | 2018-01-10T10:06:43.347 |
[
{
"message": "I have this design I grabbed online, and when I load it up in eagle and run a DRC, it gives me a bunch of airwire errors on vias that appear to serve no function. Are they just ones the designer left on there and don't care about? Is there any other possible reason why they still exist?Here's one ... | why are there unused vias in eagle design | electronics | 2018-01-10T12:22:10.393 |
[
{
"message": "I'm working on a switching circuit for a guitar amplifier that uses one DPDT relay which is powered by 12V DC supply. A SPST switch (panel mount or footswitch) will power the relay and switch to a second amplifier channel.Is it possible to wire a common-cathode RGB LED to glow one color (red) when... | Toggle between two colors in a common-cathode RGB LED using a SPST switch | electronics | 2018-01-10T15:48:18.623 |
[
{
"message": "Maybe the question that I ask is completely dumb because I am a complete noob in this, but please help.So first off, my question is that if I want to charge a 2.7v 500F supercapacitor, can I charge it using a 5v solar panel which practically produces less than 2.7 ( possibly around 1.5 - 2v ), or ... | Supercapacitor or battery with capacitor | electronics | 2018-01-10T16:24:34.597 |
[
{
"message": "Preface: I'm a Controls Engineer, not an EE.I currently have a system that tests resistance through a Device Under Test using voltage drop. I am using 12 <a href=\"https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetail:pid=2966171&library=usen&tab=1\" rel=\"nofollow noreferr... | How to reliably switch a DC analog signal that can vary from 10mV to 12V, and 1mA to 100mA | electronics | 2018-01-10T21:14:30.927 |
[
{
"message": "I've got this circuit(where u(t) should be calculated in t=3ms):<a href=\"https://i.stack.imgur.com/qGA1R.png\" rel=\"nofollow noreferrer\">Where:e(t)=260*cos(wt+25), w=2400 s^-1, Ro=15 ohm, R1=40 ohm, L=12 mH, C=20uF, t1=3ms.I've got huge problem to form equations (Laplace). All I know is that I ... | Circuit with sinusoidal voltage source - transient analysis | electronics | 2018-01-10T21:52:55.850 |
[
{
"message": "The given question : <a href=\"https://i.stack.imgur.com/u2k0g.jpg\" rel=\"nofollow noreferrer\">I went on to get Rth by adding a voltage of 1v to control the dependent source from which I obtain the current in the branches and get the total current , as follow then later decide it by 1 since 1/I ... | Getting the Thévenin equivalent resistance for a max power problem | electronics | 2018-01-11T02:54:07.873 |
[
{
"message": "I was wondering why I cannot edit footprint of LED 1206 to take care of LED 0805 as well so that I can mount one of them depending on the availability. To do this, I have to increase the pad size of 1206 footprint on the inner side to give a clearance of around 1.2 mm between two pads. I want to k... | Impact of increased pad length in PCB | electronics | 2018-01-11T07:31:26.753 |
[
{
"message": "I know that if both transistor in a cmos inverter are enhancement then the output will be as shown in the figure: <a href=\"https://i.stack.imgur.com/mtKIt.png\" rel=\"nofollow noreferrer\">But I wonder, what if one of them is enhancement and the other is Depletion?",
"role": "user"
},
{
... | Depletion mosfet inverter | electronics | 2018-01-11T12:32:00.813 |
[
{
"message": "I have a <a href=\"http://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&No=836\" rel=\"nofollow noreferrer\">DE1-SoC with some data coming in through an A-D Card. After digital processing I want to transmit data to a host PC for records.I'm trying to figure out the easiest way to... | How do I implement a communications interface to an Altera FPGA? | electronics | 2018-01-11T13:58:48.300 |
[
{
"message": "I'm using some of National Instruments' DAQs for some measurements, but their calibration is slightly off. To work around this I am hoping to factor in any imperfections into the measurements such that they can be removed.The objective is to find the transfer function of a series of passive networ... | Calibrating DAQs | electronics | 2018-01-11T14:53:22.667 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/X1Qad.png\" rel=\"nofollow noreferrer\">So how do I calculate maximum frequency if this values are given:\\$T_{Hold-ff}=0.2ns\\$,\\$T_{Delay-ff}=2ns\\$,\\$T_{Delay-nor}=0.3ns\\$,\\$T_{Delay-nand}=0.4ns\\$,\\$T_{Setup-ff}=0.5ns\\$.I thought about: \\$T_{Delay-ff}... | How do I calculate period of synchronous counter? | electronics | 2018-01-11T15:53:34.223 |
[
{
"message": "I am building a system that consists of an Arduino-type device, connected to a host computer via USB, which interfaces with some additional electronics which are driven off an isolated switching DC power supply (<a href=\"https://www.mouser.com/ds/2/260/lrs-100-spec-752931.pdf\" rel=\"nofollow nor... | how to handle GND reference in Arduino connected to separate electronics? | electronics | 2018-01-11T22:19:48.420 |
[
{
"message": "I have a PCB that is getting powered from mains and is connected to a Hi Link component (HLK-5M05 with 5V output). At the moment it is connected to <a href=\"https://www.findthetop10.com/wp-content/uploads/2017/01/ISelector-1024x1024.jpg\" rel=\"nofollow noreferrer\">an extensions with a button, a... | Burned ST LINK by connecting it to the board | electronics | 2018-01-11T22:32:32.043 |
[
{
"message": "First of all, is there a name for thse kind of converters for easy searching?There are some voltage adjustable DC to +-5-24V DC converters on eBay but they can't handle more than few hundred milliAmps.I need a +12V 1A output and -12V 0.5A output from a single 12V or 19V source.Are there similar bi... | DC to bipolar DC converters? | electronics | 2018-01-12T08:12:23.347 |
[
{
"message": "<a href=\"https://maritime.org/doc/jolie/part1.htm\" rel=\"nofollow noreferrer\">This website briefly describes the development of the first active acoustic homing torpedo of the US Navy:<blockquote> Investigation of the use of echo-ranging equipment or an \"active\" homing torpedo system was ini... | What device/component from the early 1940's can listen to only a specific narrow range of acoustic frequencies? | electronics | 2018-01-12T13:22:19.560 |
[
{
"message": "If inserting a dielectric has the effect of reducing the magnitude of the electric field in a capacitor (holding all other variables constant), then why is the energy stored in a capacitor directly proportional to the relative permittivity of the dielectric? This seems contradictory to me. A high... | Confusion regarding effect of dielectrics on energy stored in a capacitor | electronics | 2018-01-12T16:11:40.967 |
[
{
"message": "I am trying to find the RMS of an input sine wave using the ARM 7 LPC 2119 micro-controller. I know the theory behind finding the RMS of such a waveform but I am having trouble implementing this in code, especially the sampling at equally spaced mid-ordinates. I also have just used timer interrupt... | How to correctly find the RMS on ARM 7 LPC micro-controller? | electronics | 2018-01-12T17:16:09.670 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/F4LJY.jpg\" rel=\"nofollow noreferrer\">I want to calculate Vo by Thevenin's theorem. First I removed the RL(1k)<a href=\"https://i.stack.imgur.com/mTOUq.png\" rel=\"nofollow noreferrer\">Now I have to calculate Vth. Can I say that Vth is 6V? or Vth=6V + voltage... | Calculate Vth in thevenin's circuit | electronics | 2018-01-12T19:15:04.637 |
[
{
"message": "I'm designing a handheld device that has just a few buttons that will make some configuration changes. (Very much like a game controller) I'm currently making a set of 3 prototypes - a production run if any will be less than 25 units.I want to use a SMT tactile switch on a small pcb and a switch c... | Tactile switches to meet EMC standards and IP67 | electronics | 2018-01-12T20:58:41.563 |
[
{
"message": "I'm working on designing a cascode current mirror, depicted below:<a href=\"https://i.stack.imgur.com/GQFxn.png\" rel=\"nofollow noreferrer\">Constraints: all Von needs to be above 200 mV, all Vds neds to be at least double Von, L is 0.35 um.Derived from the SPICE file, k' = 181.47 uA/V^2, and the... | Wide Swing Cascode Current Mirror Biasing Difficulties | electronics | 2018-01-12T21:28:22.220 |
[
{
"message": "Just to preface: this is probably a really dumb question. I recently purchased a <a href=\"https://rads.stackoverflow.com/amzn/click/B00ZBCLJSY\" rel=\"nofollow noreferrer\">desktop power supply to work on circuit projects at home (I'm an hobbyist). I recently had issues with an op amp circuit. ... | Power Supply rail shorts to ground when loaded | electronics | 2018-01-12T23:10:32.077 |
[
{
"message": "Using a varistor is a common practice in alternator excitation system. It is used with rotating rectifier diode. Is it used for transient overvoltage protection? <a href=\"https://i.stack.imgur.com/FELdo.jpg\" rel=\"nofollow noreferrer\">Is it protecting diode or rotor winding. How this overvoltag... | Varistor transient overvoltage protection of generator | electronics | 2018-01-13T00:15:31.523 |
[
{
"message": "i'd need to connect multiple very small (1inch if not slightly more) square lcd displays to only one controller unit. I searched for it but being not an electrical engineer it seems i lack some keywords or knowledge in the matter.What i found is that websites as alibaba or similar ones are selling... | Connecting multiple 1inch lcd displays to only one MCU | electronics | 2018-01-13T11:53:33.520 |
[
{
"message": "I'm talking about devices for tracing hidden AC mains wires in walls like this one: <a href=\"https://www.ebay.com/itm/3-in-1-LCD-Wall-Detector-Stud-Center-Finder-AC-Live-Wire-Metal-Detector-Scanner-/322510160930\" rel=\"nofollow noreferrer\">https://www.ebay.com/itm/3-in-1-LCD-Wall-Detector-Stud-... | AC mains wire finder + live wire equivalent circuit | electronics | 2018-01-13T14:46:08.727 |
[
{
"message": "Regarding the following excerpt from a text:<a href=\"https://i.stack.imgur.com/YK8A0.png\" rel=\"noreferrer\">The text mentions that at RF air core transformers are adequate, but for 50/60Hz low freq. applications iron core needed to obtain a low reluctance.The text does not explain the reason. W... | Relation between transformer core material and application frequency | electronics | 2018-01-13T16:46:14.260 |
[
{
"message": "I'm confused about how small audio signals are immune to interference.Headphone wires seems twisted but are they also differential signals?As far as I know differential/balanced signals are carried by two wires and they are mirrored as shown here: <a href=\"https://upload.wikimedia.org/wikipedia/c... | Is audio signal passing through headphone differential? | electronics | 2018-01-13T19:13:44.033 |
[
{
"message": "I was going through the definition of a voltage follower in this site<a href=\"http://www.learningaboutelectronics.com/Articles/Voltage-follower\" rel=\"noreferrer\">http://www.learningaboutelectronics.com/Articles/Voltage-followerAnd a basic problem was presented, and an op-amp voltage follower a... | Does this circuit problem have a solution without an Op-Amp? | electronics | 2018-01-13T23:54:03.000 |
[
{
"message": "I have a 12V/3.2A switching PSU powering an LTC3780 buck/boost converter rated at max 2-30V/0-10A.Let's assume 100% efficiency, can the LTC3780 achieve more than 3.2A if set for example at 5V? I guess it is a general electronic question. Do we have to 1) think in watts here or 2) assume the amps o... | Powering a buck/boost converter, how much amps can I get? | electronics | 2018-01-14T03:02:33.437 |
[
{
"message": "So my current project is building a replica of the ARP Pro Soloist synthesizer from the 70’s. The project is mostly going very smoothly, but I am having some issues with the power supply section of the synth: Even after many searches, I don’t know what kind of power transformer to select.<a href=\... | Can someone help me to find the right transformer for this power supply? | electronics | 2018-01-14T13:47:56.800 |
[
{
"message": "So my current project is building a replica of the ARP Pro Soloist synthesizer from the 70’s. The project is mostly going very smoothly, but I am having some issues with the power supply section of the synth: Even after many searches, I don’t know what kind of power transformer to select.<a href=\... | Can someone help me to find the right transformer for this power supply? | electronics | 2018-01-14T13:47:56.800 |
[
{
"message": "Given is 3-to-8 decoder. There is 3 selection lines C, B, A (C=MSB and A=LSB) and one enable input. In total here are 16 adresses. <a href=\"https://i.stack.imgur.com/18GAK.png\" rel=\"noreferrer\">So first we're going to discuss only EN_A.How many address ranges are there in which the above addre... | Understanding Address decoder | electronics | 2018-01-14T14:31:23.483 |
[
{
"message": "Here i have a picture where the waveform of magnetic fluxes of each phase is given . I know that the formula for resultant vector when magnitude of two vectors are same is 2.F.cosx/2 where F is the magnitude of equal forces(flux in this case) and x is the angle between two forces.but here i got th... | Help regarding question of magnetic flux in 3 phase induction motor | electronics | 2018-01-14T15:22:43.737 |
[
{
"message": "\\$H(s)\\$ is the transfer function and we're looking for its magnitude gain. I went from the Laplace domain to the frequency domain by replacing \\$s\\$ with \\$j\\omega\\$. However, the solution didn't match what I did.<a href=\"https://i.stack.imgur.com/NssO4.jpg\" rel=\"nofollow noreferrer\">T... | Transfer function gain | electronics | 2018-01-15T01:27:10.663 |
[
{
"message": "I am trying to build a power supply unit that powers eight 9V guitar pedals (usually pedals consume 10-100mA). So, I thought I'd buy 8 cheap 9V-1A SMPS adapters and probably fix some bypass capacitors at the output to remove the ripples. This would make a very powerful isolated power supply unit w... | Eliminating the humming noise from a cheap SMPS | electronics | 2018-01-15T10:33:58.223 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/Cg36G.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/IpEIZ.jpg\" rel=\"nofollow noreferrer\">Because I wanted to find the Voc and the Isc (of the load) for the circuit to calculate Rth, I decided to put the resistance as 99999999 to find V... | Simulating a specific circuit on LTspice | electronics | 2018-01-15T11:39:39.130 |
[
{
"message": "Below is the wiring setup I plan to use:<a href=\"https://i.stack.imgur.com/17Rlj.png\" rel=\"nofollow noreferrer\">Basically the black rectangle in the middle is this <a href=\"https://www.mccdaq.com/pdfs/manuals/USB-1616HS-BNC.pdf\" rel=\"nofollow noreferrer\">data-acquisition board which has 16... | Using differential and single-ended inputs simultaneously in a data acquisition system | electronics | 2018-01-15T18:15:38.557 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/uCpDe.png\" rel=\"nofollow noreferrer\">Right now im trying to measure the AC voltage with arduino. So my plan was to convert this 230AC to 4,25 DC with this circuit and it works when i read with my tester i've got 4,25V. (The purpose of measuring AC voltage is ... | Arduino Analog pin problem | electronics | 2018-01-15T20:59:01.300 |
[
{
"message": "The transistory bits of an integrated circuit are approximately in the centre of the (plastic or ceramic) package. They sometimes get hot, and we cool them by affixing a heat sink to one side. Sometimes we just blow air over them with a fan. Some of this heat propagates upwards, but some must a... | Why aren't CPUs cooled from below as well as above? | electronics | 2018-01-15T22:49:09.580 |
[
{
"message": "I need to model a boost circuit with the following topology:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fXwEe5.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI am interested in the resistor volt... | How to solve a boost circuit (or any switched RLC circuit) in time domain? | electronics | 2018-01-16T03:16:29.800 |
[
{
"message": "I'm building a practice amplifier for my girlfriend who is learning to play the bass guitar. I'm a reasonably experienced electronics builder so building something to plug a guitar and headphones into is very simple.What I would also like to do is add a TRS input so she can play along to her iPod/... | Headphone amplifier for guitar with stereo MP3 input - mixing | electronics | 2018-01-16T08:57:26.497 |
[
{
"message": "I am trying to understand how the circuit shown below works. It converts a PWM signal to a 1-10V analog signal. The circuit is from this <a href=\"http://smoothieware.org/spindle-module\" rel=\"nofollow noreferrer\">link.I want to understand how it works because I want to design a circuit that con... | PWM to analog 1-10V converter: help to understand how it works | electronics | 2018-01-16T10:04:30.550 |
[
{
"message": "I was unable to understand a bunch of stuff related to amplifiers. Specifically my questions are as follows:What is load modulation? If i have a load of impedance of 10 ohms physically, then does load modulation change the impedance of this load? Does anyone have the theory behind load modulation ... | Questions on load modulation, Doherty PA | electronics | 2018-01-16T10:36:44.610 |
[
{
"message": "While dealing with my notes on 8255A operation mode (Interfacing) in Mode 0. I came across the statement 'Each port can be programmed in either input mode or output mode where outputs are latched and inputs are not latched.' Which seems confusing. <br>What do latching mean, in general language i... | What do latching operation mean? | electronics | 2018-01-16T10:43:58.623 |
[
{
"message": "Why is the needed channel bandwidth for a matched filter higher than the normal bandwidth derived by the nyquist theorem (2B=R, assuming L=2)?After some digging I found <a href=\"http://ee.eng.usm.my/eeacad/mandeep/EEE436/chp%203.pdf\" rel=\"nofollow noreferrer\">this source that states the follow... | Why is the bandwidth for a matched filter twice the normal nyquist theorem one? | electronics | 2018-01-16T10:45:29.213 |
[
{
"message": "I'd like to know how can a power-on/power-off system for a battery operated device with GPIO inputs can be designed that has the following features:When MCU is off, pressing and holding down a switch for 4 seconds should only turn it onThis switch must be usable as a GPIO input pin to the mcu afte... | Implementing power on/off through gpio pins for mcu while asserting for few seconds | electronics | 2018-01-16T14:51:26.157 |
[
{
"message": "The documentation I got for the MCU provides \"package trace length\" (in micrometers) as well as \"package trace delay\" (in picoseconds). For example like this - 6535.15 um package trace length for M_DQ[18] trace with delay 44.47 ps. The MCU itself has rather a high number of high speed interfac... | How can I account for package trace length in KiCAD? | electronics | 2018-01-16T15:04:02.297 |
[
{
"message": "A band has asked me to design a cuckoo clock for them that plays a piece of their music, to sell to their fans. Movements that just cuckoo and also movements that play music in addition are readily available.The basic movement sounds a cuckoo call on the hour and half hour as the cuckoo goes in an... | Changing Music on a Cuckoo Clock Movement | electronics | 2018-01-16T17:44:20.517 |
[
{
"message": "Are there resistor networks which could function as a pre-made voltage ladder? In other words are there variations on how the resistor network is assembled, ie in series or parallel? I've found <a href=\"https://www.aliexpress.com/item/20pcs-Resistor-Network-A09-471G-470-ohm/32436803935.html?spm=2... | Using resistor networks as voltage ladder | electronics | 2018-01-16T18:56:40.063 |
[
{
"message": "Please can somebody explain me where the power needed to excite non permanent magnet generator comes from,as in the beginning,generator itself hasn't produced any electrical power to generate magnetism (further magnetism is necessary to produce electricity).",
"role": "user"
},
{
"mess... | Power source of separately or self excited AC generator | electronics | 2018-01-16T19:54:51.547 |
[
{
"message": "Some transducers have both voltage and current output options.I currently use voltage outputs with around 15m BNC cables single-ended. So they are open to interference as well. Sometimes during data logging I observe noise.Would using current output/loop in this case reduce the interference picked... | A question about replacing voltage outputs with 4-20mA current outputs | electronics | 2018-01-17T02:56:44.477 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fxk1el.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabDear Group Members,I have a question which might have been asked before, but I couldn't find the... | Driving an N Channel MOSFET with Microcontroller | electronics | 2018-01-17T08:26:41.463 |
[
{
"message": "I'm using an ARM+FPGA platform to capture B2a (BeiDou or COMPASS) signals and determine the user position, velocity and precise time (PVT). The C/A frequency of B2a is 10.23MHz. If my sample rate is 20.46MHz, then I should do 32768 points-FFT by FPGA. Give me advise about how to achieve it.",
... | FPGA Frequency Domain Based Beidou-3 B2a Coarse Acquisition Processor Using FFT | electronics | 2018-01-17T09:28:15.023 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/xzMsW.png\" rel=\"nofollow noreferrer\">I want to build a constant current circuit of 317 mA using using TIP 42C PNP transistor. I am able to provide constant base current of 3.17 mA and the MINIMUM value of beta of the transistor is 30. I took beta as 100 for s... | Constant current circuit with transistor | electronics | 2018-01-17T11:01:56.147 |
[
{
"message": "I had a quick question on the electric potential between two points on a short circuit. I apologize if this question does not make sense or if I am using terms like, \"electric potential\" incorrectly. Let me know where I am incorrect in my thinking. I am trying to learn this material and it is be... | Electric potential on different points of a simple circuit | electronics | 2018-01-17T17:36:43.337 |
[
{
"message": "I am making a circuit which has buck converter LM3671 inside: <a href=\"http://www.ti.com/lit/ds/symlink/lm3671.pdf\" rel=\"nofollow noreferrer\">http://www.ti.com/lit/ds/symlink/lm3671.pdfSchematics are attached at the bottom of this post. In real application, power source is 3xAA/AAA batteries w... | Buck converter LM3671 acting as a (weird) voltage follower | electronics | 2018-01-18T09:02:36.053 |
[
{
"message": "If I got an LCD, and I didn't know anything about it, and there were no markings on the pins, how would I go about interfacing with it? For example, I got this small (around 2.5\") colour display out of an old printer, I tried everything I could, looking up a datasheet, asking on forums, but I wa... | How to work out the interface of an LCD? | electronics | 2018-01-18T09:16:50.710 |
[
{
"message": "Let suppose a 256 bit memory controller is installed on a PCB with GDDR5 memory modules.In normal mode you can split the lines into 8 group of 32 bit and drive 8 modules x 1Gbit (128 MB) = 1 GB of total frame buffer memory.In clamshell mode you can split the lines into 16 group of 16 bit and drive... | Understanding GDDR5 clamshell mode | electronics | 2018-01-18T10:18:50.157 |
[
{
"message": "I am trying to find out what transformer is it, one of standard or a custom one and what specifications does it how (i.e. power ratio).How would I go about finding that out?I do not need exact answer, but more of a methodology.The input is standard AC 100-240V 50/60Hz and output is DC 12V9A (as is... | How do I find specifications for this transformer? | electronics | 2018-01-18T10:39:52.173 |
[
{
"message": "As above really. I'd like to set up two clock signals on my STM32F103 for external circuits, one at 4 MHz and the other at 2 MHz.Here's what I've tried so far, but I'm not measuring any signal at all at the appropriate pins (PA0 and PA6.) What am I doing wrong?<pre><code>#include \"main.h\"#incl... | Set up two clock sources with an STM32F103? | electronics | 2018-01-18T12:35:53.263 |
[
{
"message": "I am building a system with multiple PCB cards. The whole system has a Chassis Ground; connected to a main Power Supply reference.All cards will be powered in reference to Chassis Ground. Each card has its own Isolated supplies ie DCDC for Digital Signals & DCDC for Analog SignalsData will be ... | Multicard System Grounding | electronics | 2018-01-18T12:59:14.890 |
[
{
"message": "I am the recipient of an incomplete set of data for several 120 volt, single phase, AC drive systems driving induction motors under various loads. The measurements were taken at the AC voltage source. I do not have a way to take more or better measurements so am forced to work with data I have. Th... | Determining V and I from limited data | electronics | 2018-01-18T18:15:56.270 |
[
{
"message": "I'm trying to wrap my head around safety standards for electrical equipment. My device is medical, so for me section 8 of IEC60601-1 is what really matters to me, but it's kind of my understanding that all of the safety standards (e.g. IEC60950) use approximately the same language and logic, howev... | Designing single fault safety into class I device | electronics | 2018-01-19T04:55:34.467 |
[
{
"message": "In the schematic/picture below, what is the purpose of 2 serial resistors for voltage divider? Temperature, thermal runaway, stocks, prices, or something else? Thank you.<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2feDskI.png\">simulate this circuit – Schematic created... | Purpose of 2 serial resistors on voltage divider | electronics | 2018-01-19T06:11:56.783 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/N0LfN.gif\" rel=\"nofollow noreferrer\">I am trying to understand this circuit but as of yet I still have a number of gaps in my reasoning. So far I have deduced:(assuming TR1 is ON and TR2 is OFF)left hand side capacitor charges towards 0.2-Vcc since Vc1 (volta... | Bistable Multivibrator using discrete transistors | electronics | 2018-01-19T18:17:50.490 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/oKBc2.png\" rel=\"nofollow noreferrer\">I am struck in the above problem. The things I was able to figure out areIt is a DC motorDirection of effective flux [Armature flux + Main Field Flux] due to the brush shift<a href=\"https://i.stack.imgur.com/CNi1I.jpg\" r... | DC Machine Ouput Voltage Waveform | electronics | 2018-01-19T18:33:19.453 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/oKBc2.png\" rel=\"nofollow noreferrer\">I am struck in the above problem. The things I was able to figure out areIt is a DC motorDirection of effective flux [Armature flux + Main Field Flux] due to the brush shift<a href=\"https://i.stack.imgur.com/CNi1I.jpg\" r... | DC Machine Ouput Voltage Waveform | electronics | 2018-01-19T18:33:19.453 |
[
{
"message": "Being relatively new to the world of sound and vibration signal manipulation, I am attempting to drive a small vibe table in an open loop configuration. For preliminary trials (AKA learning how to use the darn thing) my planned method is to:1.) Synthesize time history for my random vibration PSD2.... | Best method for using a PA to drive a vibration table? | electronics | 2018-01-19T21:59:27.513 |
[
{
"message": "Hi everyone I'm trying to use a PIC18F4550 with RS232 protocol, there's that Vusb pin, what I have to do with that pin if I don't use it, I have to connect it to ground ? I have to put a cap between Vusb and ground or what ? Can I left it floating.",
"role": "user"
},
{
"message": "Rea... | PIC18F4550 and VUSB | electronics | 2018-01-20T03:39:48.003 |
[
{
"message": "I want a Single Axis Control Stick without Potentiometer. Instead I want 2 Way 2 Contact Switch Mechanism. Does such component exist? Because if it does then it will make my project very easy.",
"role": "user"
},
{
"message": "Since you only have one axis and it is a switching operatio... | 2 Way 2 Touch Single Axis Control Stick | electronics | 2018-01-20T08:44:30.653 |
[
{
"message": "I'm trying to make a push-pull audio amplifier with a pair of power darlingtons (TIP142 and TIP147), but i'm having problems with the biasing.Here's the diagram of one of its configurations:<a href=\"https://i.stack.imgur.com/dHbIh.png\" rel=\"nofollow noreferrer\">Here i'm using 3 diodes, but I u... | Problems in push-pull biasing | electronics | 2018-01-20T15:34:55.167 |
[
{
"message": "According to Miller Effect, within amplifying devices such as transistors that have inverting voltage gain higher that one, there should be increased input capacitance with increased voltage gain of an amplifier.I has been also said that this effect is limiting the amplifier at higher frequencies.... | Understanding of Dominant Pole Compensation | electronics | 2018-01-20T16:22:43.933 |
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