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 am planning to build a custom keyboard, using a pro micro and QMK firmware, and on my plan there would be an excess of 3 PWM pin. So I thought I can maybe put RGB leds on it on parallel. But the problem is how, it is just possible that I will just wired them on parallel, then it will work or I n... | Do I need diodes or resistor for PWM controlle RGB LED? | electronics | 2017-09-10T03:18:35.753 |
[
{
"message": "here is the website I will be referencing: <a href=\"http://www.instructables.com/id/5-Mini-USB-Fridge!/\" rel=\"nofollow noreferrer\">http://www.instructables.com/id/5-Mini-USB-Fridge!/So I was reading from Inscrutables on powering a small Peltier TEC to cool your hand while reading, and so I bou... | Trouble with Peltiers TEC and USB Output Current | electronics | 2017-09-10T04:07:00.917 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fTEvq1.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI'm having a difficult time analyzing the circuit shown and would appreciate some help. I'm jus... | Analysis of Negative Input Resistance Op Amp | electronics | 2017-09-10T07:12:12.700 |
[
{
"message": "What is the difference between half wave voltage doubler and full wave voltage doubler?(Using Practical Diode with forward bias voltage Vd)To be specific:i)Do the two differ in their principle of working in anyway?ii)How do the two differ in input/output waveforms?iii)What is the effect of change ... | What is the difference between half wave voltage doubler and full wave voltage doubler? | electronics | 2017-09-10T07:25:24.603 |
[
{
"message": "We know that we receive the programs/shows of TV Channels from the producers of programs throughCATV Service providers (almost obsolete, just wanted to get clarified on its working process)DTH Service.Consider that a TV Channel produces programs and wants its programs to be telecasted to a wide a... | Role of Coax Cable in bringing TV signal to our TV sets | electronics | 2017-09-10T13:32:24.320 |
[
{
"message": "I'm hoping someone can help me identify this connector housing. It is 3-pin nylon and keyed by small squares in two corners. I've searched all through Mouser, Digikey, TE, etc and haven't found it.<a href=\"https://i.stack.imgur.com/CdpKV.jpg\" rel=\"nofollow noreferrer\">",
"role": "user"
}... | Identification of nylon 3-pin connector | electronics | 2017-09-10T15:25:00.037 |
[
{
"message": "I'm looking in the <a href=\"http://www.ti.com/product/DP83848I/technicaldocuments\" rel=\"nofollow noreferrer\">datasheet and layout guide of the DP838481 but I can't seem to find where it talks about length matching for the RX and TX differential pairs. It only mentions length matching for the M... | Differential Pair Length Matching for DP83848I | electronics | 2017-09-10T15:33:56.407 |
[
{
"message": "I'm looking in the <a href=\"http://www.ti.com/product/DP83848I/technicaldocuments\" rel=\"nofollow noreferrer\">datasheet and layout guide of the DP838481 but I can't seem to find where it talks about length matching for the RX and TX differential pairs. It only mentions length matching for the M... | Differential Pair Length Matching for DP83848I | electronics | 2017-09-10T15:33:56.407 |
[
{
"message": "Recently I've got my hands on several 20x2 character displays which don't seem to work. This is what they look like:<a href=\"https://i.stack.imgur.com/X3vrL.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/7rUKP.jpg\" rel=\"nofollow noreferrer\">Apparently, they are HD44780-c... | Is this 20x2 character display broken? | electronics | 2017-09-10T21:14:19.453 |
[
{
"message": "I am rather new to digital logic, so please try to make you answers as understandable/simple as you can. Anyway, In fig 1, everything works as you would expect, where the led(circle symbol in schematic) lights up only when both inputs(bases of transistors) are high. In figure 2, however, when repl... | AND gate output always high? | electronics | 2017-09-10T21:20:26.230 |
[
{
"message": "I am trying to use a KBRG 225D regen drive as a dynamometer to apply reverse torque in order to stress my test engine? I am wondering if anyone has experience or guidance? I am not sure how to measure the reverse torque generated by the drive?<a href=\"https://i.stack.imgur.com/4mQaM.png\" rel=\"n... | Generate measurable reverse torque with DC motor as a dynamometer | electronics | 2017-09-10T22:40:00.327 |
[
{
"message": "If I have a 2.4A 5V Max Output Battery Pack, and I buy a 12V, 60 Watt Peltier Element and a 5V .4A computer fan (leaving room for comfort, item is actually 5v .36A), could I run both off of that one battery pack? For Further clarification, I will split the USB cable that powers both objects two wa... | Beginner Question on Whether Running A Fan and Peltier off a Battery Pack Would Work | electronics | 2017-09-11T04:25:43.723 |
[
{
"message": "I need get strain gauge reading to Arduino. so far i have found load cell Wheatstone configuration circuit <a href=\"https://electronics.stackexchange.com/questions/199487/connect-hx711-to-a-three-wire-load-cell\">here 3rd answer. I need to know if i connect a strain gauge to one +Active resistanc... | how to connect strain gauge to HX711 module | electronics | 2017-09-11T06:09:46.023 |
[
{
"message": "Project: make a power supply that can replace the 240V AC supply shown, so that I don't die when messing with <a href=\"https://electronics.stackexchange.com/questions/325012/is-it-possible-to-double-the-resistance-of-a-potentiometer\">the board that this connects to.I'm only interested in the par... | Is this negative regulator really meant to be an inverted positive regulator? | electronics | 2017-09-11T08:40:38.723 |
[
{
"message": "I'm trying to build an IR Barrier with an 555, a sfh4547 and a tssp58038. Here are the datasheets:<a href=\"http://www.ti.com/lit/ds/symlink/ne555.pdf\" rel=\"nofollow noreferrer\">http://www.ti.com/lit/ds/symlink/ne555.pdf<a href=\"https://www.osram-os.com/Graphics/XPic0/00209793_0.pdf/SFH%204547... | IR Barrier with a 555 | electronics | 2017-09-11T10:08:30.333 |
[
{
"message": "I am trying to design a voltage-controlled current source supplying 0 -> +/-2Adc into a 20Ohm, 100mH load from a +/-100Vdc supply. I need at least 3kHz bandwidth for small signals, but my current circuit lags well below this point and I am struggling to find out why. Here is the circuit :<a href=\... | Designing a high power analog current controller using an opamp+MOSFET push-pull | electronics | 2017-09-11T10:54:26.097 |
[
{
"message": "I bought a Winstar 144x32 LCD (WG14432D) because it was cheap and it would be nice to do some experiments with it. The main problem with this LCD is that it has no (working) library for it.I already searched the whole Internet with Google, but my results were unimpressive:<a href=\"https://forum.c... | No PSB pin on LCD? | electronics | 2017-09-11T11:05:34.817 |
[
{
"message": "I'm disabled and am looking to be able to charge my power chair whilst I'm on the go in my vehicle, the problem is that I know what my charger draws and outputs in Volts and Amps, but all inverters' power outputs are in Watts, totally confusing!The charger is a 110/240V in the wall charger and the... | Stumped on an inverter | electronics | 2017-09-11T14:43:39.053 |
[
{
"message": "Please note: Although this question tangentially involves a Raspberry Pi, this is really more just a pure electronics question at heart.I'm trying to connect my Raspberry Pi 1 Model A to <a href=\"https://www.adafruit.com/product/1684\" rel=\"nofollow noreferrer\">this pushbutton. I believe my pus... | Calculating the resistor for a 12V pushbutton | electronics | 2017-09-11T16:27:52.737 |
[
{
"message": "I'm replacing the batter in a Game Boy Advance game cartridge.(Don't mind the bad solder job; the iron isn't handling well.)I've gotten it to work, but the battery is held down with very little force; so I don't have much confidence in the actual connection between the bottom pad and the positive-... | How do I secure the connection to this battery (CR1616)? | electronics | 2017-09-12T02:00:02.617 |
[
{
"message": "I have a requirement to change the transistor/mosfet switch state at two different voltages.<a href=\"https://i.stack.imgur.com/GA89e.png\" rel=\"nofollow noreferrer\"> Below is a small graphical representation. 3.3 v (red) to 4.5 (green). switch should be open when the voltage is between red lin... | Turning switch state at two different voltage | electronics | 2017-09-13T05:28:00.303 |
[
{
"message": "Please, can someone explain me how the transistors here reduce the voltage from +40 VDC to +15V in the positive side (upper part of circuit)<a href=\"https://i.stack.imgur.com/buIJp.jpg\" rel=\"nofollow noreferrer\">These are the voltages observed across different components of the power supply ca... | Power Supply Card of Float Charger 150A | electronics | 2017-09-13T08:20:24.317 |
[
{
"message": "In my circuit my motor terminals are connected to the output of a VNH5019A motor driver <a href=\"https://www.pololu.com/product/1451\" rel=\"nofollow noreferrer\">https://www.pololu.com/product/1451. When the circuit is no longer powered I want to allow the user to freely rotate the motor (a dc m... | How to allow a motor to free spin? | electronics | 2017-09-13T11:50:09.080 |
[
{
"message": "When AC coupling the input signal to a Class AB (Push-Pull / Complementary Pair) which is diode biased I see two different approaches:Signal connected between biasing diodes with single decoupling capacitor:<a href=\"https://i.stack.imgur.com/01xJr.png\" rel=\"nofollow noreferrer\">Signal connecte... | Input coupling to Class AB amp with diode bias. One capacitor or two? | electronics | 2017-09-13T19:03:03.103 |
[
{
"message": "We are building a mobile robot which will use two motors in a differential drive configuration to maneuver and move around, and we want to choose the right driver IC or transistor circuit for the job of controlling these motors and providing enough current. Our motors are rated at a power of 14W ... | Will this N-Channel Mosfet work as high-current motor controller? | electronics | 2017-09-14T03:00:02.577 |
[
{
"message": "Just as the title says. I have searched for a whole day and haven't found any confidential materials to verify whether there is a pulse shaping after OFDM modulation in NB-IoT?For example, in <a href=\"https://www.nxp.com/docs/en/white-paper/3GPPEVOLUTIONWP.pdf\" rel=\"nofollow noreferrer\">https:... | Is there a pulse shaping after OFDM modulation in NB-IoT? | electronics | 2017-09-14T03:23:18.803 |
[
{
"message": "Is it possible to use one battery pack as this one (<a href=\"https://www.aliexpress.com/item/DC-12V-6800mAh-Super-Electrical-Rechargeable-Battery-Lithium-Li-Ion-Batteries-Pack-For-Wireless-Transmitter-CCTV/32818550364.html?ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10068_10344_10... | powering 12v LED strip + raspberry + servo with 1 12v battery | electronics | 2017-09-14T11:18:17.733 |
[
{
"message": "I have an inquiry regarding the l298n motor driver.I encountered a problem while using it. It's like this: every time i attach the wires of my dc motors into the board's \"motor A\" and \"motor B\" connectors, my dc motors wont move. I re-checked my code to see if there were errors, but there were... | Arduino and motor driver l298n separate power supply circuit | electronics | 2017-09-14T13:56:43.873 |
[
{
"message": "What can i do to minimize overshoot and undershoot when MOSFET switches on and off? (waveform taken using short ground spring probe, PCB is 2-layer) The rise and fall times should be less than 150ns.Here is the picture without snubber (R1, C27)<a href=\"https://i.stack.imgur.com/nxHTD.jpg\" rel=\"... | Overshoot on MOSFET drain | electronics | 2017-09-14T16:12:07.777 |
[
{
"message": "What can i do to minimize overshoot and undershoot when MOSFET switches on and off? (waveform taken using short ground spring probe, PCB is 2-layer) The rise and fall times should be less than 150ns.Here is the picture without snubber (R1, C27)<a href=\"https://i.stack.imgur.com/nxHTD.jpg\" rel=\"... | Overshoot on MOSFET drain | electronics | 2017-09-14T16:12:07.777 |
[
{
"message": "I have made this circuit using <a href=\"http://www.ti.com/lit/ds/symlink/tps63030.pdf\" rel=\"nofollow noreferrer\">TPS63031:<a href=\"https://i.stack.imgur.com/EnxzK.png\" rel=\"nofollow noreferrer\">Here is the board file:<a href=\"https://i.stack.imgur.com/PTY9L.png\" rel=\"nofollow noreferrer... | Ground plane for a buck boost regulator circuit | electronics | 2017-09-14T17:24:41.690 |
[
{
"message": "This is my problem <a href=\"https://i.stack.imgur.com/Z5Mre.png\" rel=\"nofollow noreferrer\">Now I know that ideally $$V_1/V_2 = 1:α$$ and $$(J_1-J_3) = α (J_2-J_3)$$ where J1 is the current of the left mesh, J2 is the current of the right mesh and J3 is the current of the mesh in the middle(th... | Ideal Transformer equations when the secondary winding is short-circuit? | electronics | 2017-09-14T19:52:09.013 |
[
{
"message": "I don't have one of those simple voltage detectors but I do have a Klein CL1000 meter and I need to identify the live and neutral wires from a plug in a socket. It's a 2 prong socket in Central America, 120Vac 60Hz.Here is the link to the meter: <a href=\"http://www.kleintools.com/catalog/discont... | Can I identify live or neutral wire with Klein CL1000 | electronics | 2017-09-15T02:20:03.327 |
[
{
"message": "I'm working with a high power LED(40W heat dissipation) on a single layer aluminium core PCB.To calculate the required heatsink it did the following:\\$P = 40W\\$\\$Rjc = 0.6K/W\\$ (datasheet)\\$Rcpcb = 0.77K/W\\$ case to PCB. This is the thermal resistance of the isolation layer(MSC TC-Lam 1.3, 1... | High power LED on aluminium core PCB | electronics | 2017-09-15T07:33:01.923 |
[
{
"message": "My motherboard has a WS2812B header for use in addressable RGB LED strips. However I am not using them for those strips, as instead I would like to use the signal to separately control several other RGB LED devices (fans, reservoir, GPU, monoblock, ...). The WS2812B connector itself is rated at 3A... | Splitting induvidual WS2812B LEDs | electronics | 2017-09-15T10:28:59.007 |
[
{
"message": "I want to create a small battery-powered device that can emit a few bytes per day to as far as possible (100 km?). While discussing with someone working on sensors placed outside (even in the countryside), he said that they use ~170 Mhz (ultra short waves), with a device such that the battery can ... | Small size ultra short waves (UKW) emitter | electronics | 2017-09-15T14:42:29.393 |
[
{
"message": "I am looking to get a USB battery pack for use with both my phone and my bluetooth headset, but my bluetooth headset has a drain of only around 50mA when charging, and it seems that most battery packs have a minimum current draw of 50mA, below which they will shut off (presumably to prevent vampir... | Analog circuit to maintain a minimum current? | electronics | 2017-09-15T15:58:09.737 |
[
{
"message": "I am looking to get a USB battery pack for use with both my phone and my bluetooth headset, but my bluetooth headset has a drain of only around 50mA when charging, and it seems that most battery packs have a minimum current draw of 50mA, below which they will shut off (presumably to prevent vampir... | Analog circuit to maintain a minimum current? | electronics | 2017-09-15T15:58:09.737 |
[
{
"message": "Below is a system where a signal source on the left is floating/ungrounded/unearthed and the measurement system on the right is earth-grounded through the signal analog ground AGND:<a href=\"https://i.stack.imgur.com/SLWh0.gif\" rel=\"nofollow noreferrer\">Regarding the above setup I have the foll... | Some questions about a single ended system and common mode noise | electronics | 2017-09-15T17:37:15.807 |
[
{
"message": "I just designed a board using the MCP2221A USB-to-USART Bridge device from Microchip. My development platform is currently on Windows 10. I have downloaded all of the files and utility programs I could find from the Microchip website. I also downloaded the file set MCP2221 Windows Driver 2014-10-0... | MCP2221A USB to USART with Windows 10 Drivers | electronics | 2017-09-15T19:32:51.900 |
[
{
"message": "I have built a 3s 156 p Samsung 22p pack to use as a house battery in my van. I'm trying to find a charger for it. Currently I am using my balance charger tenergy tb6b. Here is a screenshot with the data sheet on it. How would I use this information to calculate charge current and any recommendati... | Calculating a good charge current for 3s156p 18650 | electronics | 2017-09-15T19:44:26.597 |
[
{
"message": "From time to time I hear (and read) that it is not good to make separate Gnd planes for digital and analog circuit parts. It's all summarized in this rule of thumb: \"Don't split the Gnd plane, don't make gaps in it.\" Usually this comes without clear explanation.The closest I got to an explanatio... | Why exactly is it discouraged to gap the ground plane? | electronics | 2017-09-16T07:40:54.243 |
[
{
"message": "From time to time I hear (and read) that it is not good to make separate Gnd planes for digital and analog circuit parts. It's all summarized in this rule of thumb: \"Don't split the Gnd plane, don't make gaps in it.\" Usually this comes without clear explanation.The closest I got to an explanatio... | Why exactly is it discouraged to gap the ground plane? | electronics | 2017-09-16T07:40:54.243 |
[
{
"message": "I would like to design a comparator circuit with hysteresis, which will provide a PWM signal in the output as shown in figure 2. The first input of the comparator circuit will be a sinusoidal signal as shown below in figure 1 and the other input of the comparator fed by a triangular waveform. Is t... | Help Comparator circuit | electronics | 2017-09-16T11:03:59.987 |
[
{
"message": "Some devices output differential outputs since both wires carry varying signals which are mirrored. Most devices on the other hand output one signal carrying and one GND wire. There is also differential-ended wiring and single-ended wiring. My question will be about \"external\" interference type ... | What is the practical advantage of using mirrored signal outputs eventhough what matters is balancing the wires? | electronics | 2017-09-16T13:01:53.953 |
[
{
"message": "I have Engineering background but not Electrical. I am working on a project where I have to integrate a sensor which has an analog voltage output to a LoPy module for IoT applications. Another person is taking care of the LoPy module stuff but I do need to provide him the output in 8-bit digital s... | Convert an analog voltage into digital and relay it in serial over a single wire | electronics | 2017-09-16T16:49:35.370 |
[
{
"message": "During data call or fax call echo cancellers are switched off in entire path from phone to exchange and exchange to phone.Echo canceller are used to cancel echo during voice call. Modulation in data and fax call also done in baseband carrier. Why echo cancellers are switched off during fax or data... | What is effect of echo canceller on QAM signals? | electronics | 2017-09-16T18:22:08.900 |
[
{
"message": "I read that output frequency of asynchronous counter will be \\$\\frac{f_{in}}{2^n}\\$ where \\$n\\$ is number of flip flops and \\$f_{in}\\$ is input frequency.In synchronous counter will the output frequency always be \\$\\frac{f_{in}}{2}\\$ ? As clocks are activated simultaneously for all flip ... | Output frequency of asynchronous and synchronous counter | electronics | 2017-09-17T08:53:03.530 |
[
{
"message": "Consider 4 bit counter as shown below:-<a href=\"https://i.stack.imgur.com/AepQD.png\" rel=\"nofollow noreferrer\">Here suppose we consider propagation delay of each flip flop =2ns and propagation delay of each AND gate is 3ns, then what will be the total propagation delay?As all flip flops get th... | Propagation delay in case of synchronous counters | electronics | 2017-09-17T14:43:56.873 |
[
{
"message": "I need to convert 12v inputs to a 3.3v electric imp005, i have a bunch of TLP521 optocouplers i bought to repair something (i've never used one in a circuit before).From the <a href=\"http://skory.gylcomp.hu/alkatresz/P521.pdf\" rel=\"nofollow noreferrer\">data sheet it looks like the recommended ... | Calculating correct resistor for an optocoupler | electronics | 2017-09-17T16:44:33.840 |
[
{
"message": "I know that low voltage damages AC induction motors and usually under voltage protection relays are used to trip the motor in such conditions. But the theory behind that is confusing to me. After searching on the internet I found the below answer (Still not clear enough for me)P=VI, motors are man... | How does low voltage burn out induction motor | electronics | 2017-09-18T04:30:58.910 |
[
{
"message": "I want to know if is possible to update the firmware of the NFC chip PN532 from NXP. If it is, how can this be done?If this isn't the appropriate Stack exchange site please move the question.",
"role": "user"
},
{
"message": "I would assume so. It's expensive to use <a href=\"https://e... | Is possible to update the firmware of the PN532 chip? | electronics | 2017-09-18T11:54:54.260 |
[
{
"message": "I was trying to compare the differences between passive and active filters and below is for almost same cut off and by using an ideal opamp:<a href=\"https://i.stack.imgur.com/JBBUW.png\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/NH17C.png\" rel=\"nofollow noreferrer\">Above ... | Unexpected plots for active low pass filter response in LTspice | electronics | 2017-09-18T13:18:35.257 |
[
{
"message": "I was trying to compare the differences between passive and active filters and below is for almost same cut off and by using an ideal opamp:<a href=\"https://i.stack.imgur.com/JBBUW.png\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/NH17C.png\" rel=\"nofollow noreferrer\">Above ... | Unexpected plots for active low pass filter response in LTspice | electronics | 2017-09-18T13:18:35.257 |
[
{
"message": "i have purchased a <a href=\"https://www.dfrobot.com/product-1025.html\" rel=\"nofollow noreferrer\">small board to measure pH with a MCU.I am using a ADS1115 as ADC that have an internal Vref, that should be precise enough for my purpose.Now, if i connect my Vin to the ADC pin, and read the Vin, ... | stable DC converter for PH analog reading | electronics | 2017-09-18T15:40:14.917 |
[
{
"message": "I'm using the following Texas Instruments devices: <a href=\"http://www.ti.com/product/DRV8838/datasheet\" rel=\"nofollow noreferrer\">DRV8838 (Low-Voltage H-Bridge Driver) and <a href=\"http://www.ti.com/lit/ds/symlink/msp430g2553.pdf\" rel=\"nofollow noreferrer\">MSP430G2553 microcontroller. The... | Controlling a latching solenoid with the DRV8838: Is this PCB design correct? | electronics | 2017-09-18T17:33:46.367 |
[
{
"message": "The below given circuit works as a switch. The P channel MOSFET has max <code>Vdss = -30V and Vgss = +/- 20V</code>.<a href=\"http://www.mouser.com/ds/2/408/Mosfet-Toshiba-SSM3J334R_datasheet_en_20101203-483306.pdf\" rel=\"nofollow noreferrer\">MOSFET DATASHEETThe voltage divider protects the gate... | Reverse voltage flowing from drain to source in P channel MOSFET | electronics | 2017-09-18T18:56:27.090 |
[
{
"message": "For a project I'm using 4 12V, 35AH lead acid batteries in series which powers a 400W, 48V bldc motor. The maximum current the motor would draw from the battery set is 12A. <a href=\"https://i.stack.imgur.com/N3XYL.jpg\" rel=\"nofollow noreferrer\"><a href=\"https://i.stack.imgur.com/cLvAY.jpg\" r... | How to choose connecting wires and switches for a motor-battery set | electronics | 2017-09-19T04:28:19.610 |
[
{
"message": "As far as I know, voltage is a defined with respect to a common ground in circuits. So if there is a source and a receiver/amplifier; then they should have a common ground if we want to talk meaningfully about the voltages at any node.Below illustration showing a differential amplifier used for bo... | A basic level question about grounds in a differential amplifier circuit | electronics | 2017-09-19T13:31:30.337 |
[
{
"message": "I built and simulated this BJT current buffer for an opamp based on examples I found in various places online:<a href=\"https://i.stack.imgur.com/RPcY7.png\" rel=\"nofollow noreferrer\"><a href=\"http://www.falstad.com/circuit/circuitjs.html?cct=$+12+0.000049999999999999996+1.2182493960703473+54+5... | Design of a discrete BJT current buffer for low-current op amp | electronics | 2017-09-19T17:32:14.203 |
[
{
"message": "For my project which for the next (many) months I want to make it on a breadboard.I ordered RJ45 connectors, but these do not fit on a breadboard. What would be a good way (or is there a way) to connect these on a breadboard?Of course I can solder 8 wires but than still the connector is hanging lo... | RJ45 connector on breadboard | electronics | 2017-09-19T21:51:01.787 |
[
{
"message": "I have been given a measurement circuit that is measuring voltage drop across a switch. The idea is that it uses the 4 wire method for measuring resistance. However for our purpose we are not measuring current and are only concerning ourselves with voltage drop.Using this method we have a repeat-a... | Abnormal Voltage drop reading, 4 wire vs 3 wire, Singled ended input | electronics | 2017-09-20T13:26:35.847 |
[
{
"message": "There is a step-down transformer with a primary voltage rating of 120 volts, a secondary voltage rating of 48 volts, and a VA rating of 1 kVA (1000 VA). The maximum secondary winding currents can be determined as such: 1000VA / 48V = 20.83A.So if I connect a pure resisitive circuit/load to the sec... | Changing the power factor of a circuit when connected to transformer | electronics | 2017-09-20T14:26:30.067 |
[
{
"message": "In my previous question I focused on lead-based solder alloys (see <a href=\"https://electronics.stackexchange.com/questions/330309/best-solder-wire-sn63pb37-vs-sn60pb40-vs\">Best solder wire - Sn63Pb37 vs Sn60Pb40 vs ...?).Some of you brought new exciting solder alloys to my attention. The two mo... | Bismuth or Indium solder - how do they compare? | electronics | 2017-09-20T17:24:39.970 |
[
{
"message": "Please keep in mind I am a beginner. Hopefully my terminology is correct.I've purchased a new product called a <a href=\"https://bemighty.com/\" rel=\"nofollow noreferrer\">Mighty, which is sort of like an iPod but it streams music. It works great with a set of headphones, but I tried plugging i... | Create an audio cable with 100k ohm resistors | electronics | 2017-09-21T01:58:14.560 |
[
{
"message": "Suppose you've got two 5V1 zeners in parallel. Due to slight differences between the two parts (tolerance on zener voltage), one of them will conduct more current.<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fnFKLX.png\">simulate this circuit – Schematic created using ... | Current distribution for parallel zeners | electronics | 2017-09-21T09:00:57.967 |
[
{
"message": "Two questions: I thought that a resistor network/array was just a combination of resistors together. Is there anything more to it? This question distinguished a resistor network vs a bunch of discrete resistors: <a href=\"https://electronics.stackexchange.com/questions/76793/pros-and-cons-of-using... | Why use a resistor network, and how are they special? | electronics | 2017-09-21T16:52:49.387 |
[
{
"message": "Below represents a differential measurement system for a data-acquisition:<a href=\"https://i.stack.imgur.com/wwZ7M.gif\" rel=\"nofollow noreferrer\">As far as I understood, in a differential measurement system neither the outputs of the signals nor the inputs to the differential amplifier is tied... | A question about differential measurement system | electronics | 2017-09-21T17:13:07.837 |
[
{
"message": "I'm in the midst of prototyping my circuit. However during testing, the psu led light keep flickering and there was no output observed. Subsequent investigation revealed that the mosfet have actually short circuited. I have short circuited 3 pieces of mosfet so far. Please refer to the image for r... | Mosfet keep getting short circuit | electronics | 2017-09-21T23:35:11.333 |
[
{
"message": "Currently when I work with microcontrollers, I use Microchip PICs and I'm happy enough with them. However, I decided to just take a look at ARM for a possible upcoming project. I wanted the pick the best (fastest at calculations at the cheap/low-power end) ARM. On the ARM website(<a href=\"https:/... | ARM Cortex M0+ CoreMark Ratings | electronics | 2017-09-22T14:18:32.697 |
[
{
"message": "In the below circuit, the DC component (6V) of a bridged car head unit speaker wire turns on a LM53601 buck converter. The LM53601 accepts voltages up to 42V. The +12V input into Q2 is protected to withstand the pulses described in ISO 7637. I have used this circuit in my car for some months now, ... | How to combine and protect two 12V automotive signals into one? | electronics | 2017-09-22T14:54:41.180 |
[
{
"message": "I'm designing myself a custom home automation system. Eventually, I want to expand the system to include security/alarm. The easiest way I know to do this is to include wireless capabilities. This got me thinking about wireless security. The messages from let's say motion detectors should be encry... | Wireless security for repetitive messages? | electronics | 2017-09-23T11:40:16.167 |
[
{
"message": "I'm trying to use the mic input on my iPhone to record line level audio.I have made a cable with an attenuator as shown in the picture below.<a href=\"https://i.stack.imgur.com/IcQN0.jpg\" rel=\"nofollow noreferrer\">Recording from my macbook pro works like a charm (3,5mm headphone jack).Recording... | problem solving: line level to iphone attenuator buzzing sound | electronics | 2017-09-23T14:48:13.847 |
[
{
"message": "I don't have any experience in designing analog or digital ICs.But from what I have read there must be a reason to call an IC analog or digital.I have the following questions:Does/Can an analog IC include any transistor which are operating in saturation region as switch?Or similarly can a digital ... | A question about analog IC vs digital IC | electronics | 2017-09-24T01:49:44.747 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/EN3VR.png\" rel=\"nofollow noreferrer\">To start, imagine the branch containing the current source as a node, a point currents flow in and out of. This gives us: $$i_3+i_4-i_1-i_2=12mA$$.We also know by summing all currents flowing in and out of Node1 that: $$-... | How do I figure out the voltages at these 3 nodes of a circuit? | electronics | 2017-09-24T03:41:25.383 |
[
{
"message": "Is it possible to add two independent power supplies together to achieve a steady 3.3V powers supply? One power supply will be running from a 9V battery and the other is a 12V source. They both don't have to necessarily run together i.e. the if the 9V battery is just connected, it should still sup... | ORing 2 power supplies for 3.3V output | electronics | 2017-09-24T06:01:20.827 |
[
{
"message": "I am using SSM3J334R P channel MOSFET for switching high voltage which has following specs<pre><code>Drain-Source voltage (VDSS) -30 VGate-Source voltage (VGSS) ±20 V</code></pre>There are two ways to protect the Gate of the MOSFET from excessive voltage or exceeding the Vgs.One is voltage divide... | MOSFET Gate protection | electronics | 2017-09-24T07:22:06.933 |
[
{
"message": "I'm trying to amplify my PWM signal from 0-5V to 0-10V. As the nature of my project is a flyback converter, I thought that using a logic level mosfet with gate inputs from Arduino was enough to switch it but I was proven wrong. I've got a pwm from china on the way but it is only able to go 0-5V 10... | Amplify PWM signal from 0-5V to 0-10V | electronics | 2017-09-24T08:32:39.467 |
[
{
"message": "I'm trying to understand the application of the water electrical conductivity measurement circuits based on transimpedance amplifier.Here the picture of general TIA configuration<a href=\"https://i.stack.imgur.com/mI5Y7.gif\" rel=\"nofollow noreferrer\">And here what I'm talking about<a href=\"htt... | Transimpedance amplifier circuit for water conductivity | electronics | 2017-09-24T13:34:50.723 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/cTrFf.png\" rel=\"nofollow noreferrer\">The two circuits are equivalent. Using Kirchoff Voltage Law.(KVL)For Loop1, I have: $$12+3000i_1+2000(i_1+1)=0$$.For Loop2, I have: $$5000i_2+2000(i_2-1)=0$$.Now, there are two ways to find the current in the middle branch... | I got two different results for the current in one branch, what is wrong with my KVL equations? | electronics | 2017-09-24T17:12:17.907 |
[
{
"message": "What I am trying to do is to digitally send a signal through a cat5 cable. I wan't to send it digitally so people can't just come along and put a voltage on the wires to activate the circuit. I would like the signal to come from the main control board. Thanks.",
"role": "user"
},
{
"me... | Controlling a circuit through a cat5 cable | electronics | 2017-09-24T22:53:17.190 |
[
{
"message": "Yesterday I soldered quite some things, but I'm still a beginner.I noticed that sometimes it happened that sometimes I use to much solder. When trying to remove it, I heat the pin with solder so it melts, and when pulling back to clean the tip to remove the excessive solder, I notice that the rema... | Soldering question | electronics | 2017-09-25T09:01:09.647 |
[
{
"message": "I am currently trying to create a band stop filter which attenuates frequencies between 2000Hz and 8000Hz. I have got the transfer function but now I am struggling to find the documentation on how to pass a square wave of 6000Hz and another sqaure wave of 20 000Hz to test the filter. I am doing th... | How to pass a square wave through transfer function in MATLAB? | electronics | 2017-09-25T11:47:56.147 |
[
{
"message": "I'm trying to use the capacitative touch chip CPT112S for a project. It comes in QFN20 3x3 package size but the pad layout is different to what I expected and so doesn't fit the DIP adapters I have. I'm prototyping and so need to be able to hand-solder the chips. I was expecting a package like thi... | QFN20 package sizes | electronics | 2017-09-25T14:18:14.017 |
[
{
"message": "We have designed a board that uses an ATMega2560 and wanted to have the option to do remote firmware updates (it has a Sim800C as well for getting the firmware files).Therefore we've added an SST25VF016B memory module (to store the firmware) and coupled it with a Logic Level Converter (as Atmega i... | ICSP + SST25VF016B + ATmega2560 Problem | electronics | 2017-09-26T10:18:29.887 |
[
{
"message": "There is a single ended floating source connected to a data-acquisition device. The system is categorized as single ended earth grounded. Here is the recommended wiring as I use:<a href=\"https://i.stack.imgur.com/rUmFg.gif\" rel=\"nofollow noreferrer\">Now imagine the source is unbalanced and cau... | A question about using active filter to mitigate both differential and common mode noise | electronics | 2017-09-26T12:47:40.337 |
[
{
"message": "I have an architecture like this:<a href=\"https://i.stack.imgur.com/lX0M2.png\" rel=\"nofollow noreferrer\">Master - It contains an RF communication chip. All nodes rely on Master to receive and send data to a central unit.Node - It has some basic GPIO functionality. There can be 4-5 different ty... | Two way communication between one master and multiple nodes | electronics | 2017-09-26T19:18:27.937 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f9pvuS.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI have several about this op-amp curcuit:i1 flows from Node 1. Does it flow into the op-amp? Or ... | Does anything flow out of an op-amp? | electronics | 2017-09-26T22:18:12.233 |
[
{
"message": "I have several single coil latching relays, (low rep points so not hyperlinking), mouser.com/ds/2/212/KEM_R7002_EC2_EE2-540906.pdf (EC2-5SNU).I am trying to control them by an MCU; connected directly they work fine, but I am iffy about keeping it this way so I'm trying to power them through a darl... | MCU to switch single coil latching relay not working (attempting array with common gnd) | electronics | 2017-09-27T00:55:27.890 |
[
{
"message": "I have a simple question. Can <a href=\"https://1bitsquared.com/collections/frontpage/products/black-magic-probe\" rel=\"nofollow noreferrer\">black magic probe be used to do boundary scan?I couldn't find that it says explicitly that. If not, what would be cheapest alternative to do that on STM32 ... | Black magic probe boundary scan | electronics | 2017-09-27T01:46:29.613 |
[
{
"message": "Can someone explain to me how this (as advertised) full bridge load cell works?<a href=\"https://i.stack.imgur.com/TCtCF.jpg\" rel=\"nofollow noreferrer\">I'm aiming for good temperature stability and I understood a full bridge load cell configuration should reject error from temperature variation... | Load cell temperature compensation | electronics | 2017-09-27T06:14:54.793 |
[
{
"message": "So I'm using a Fluke i200s current clamp in combination with an oscilloscope to measure the AC current. Normal current clamps have a current output, but this one has a voltage as output. Now my question is does this clamp has the same working principle as the others(like a transformer with one pr... | Voltage output of AC current clamp | electronics | 2017-09-27T12:53:15.413 |
[
{
"message": "Many circuits nowadays accept only 3.3 V as input voltage, maximum 3.6 V, but they can work often down to 2.7 V.Since Lithium batteries (LiPo and LiIon) provide 4.2-3.3 V when charged-discharged (not completely, but substantially), a diode could be used to drop the supply by a relatively constant ... | What are the disadvantages of using a diode to drop Vcc by a fixed amount? | electronics | 2017-09-27T15:40:40.943 |
[
{
"message": "Lets say an induction motor's spec sheet states the following:1/ 50 Hz, 2-pole, full-load rotations-per-minute (RPM) = 2850.2/ 60 Hz, 2-pole, full-load RPM = 3450.Can we extrapolate this information to find out the full-load RPM for other frequencies (i.e.: 20 Hz, 30 Hz, 40 Hz, etc.)?(SPECIFIC EXA... | How to determine full-load RPM of an induction motor at any arbitrary frequency? | electronics | 2017-09-27T18:47:18.747 |
[
{
"message": "Lets say an induction motor's spec sheet states the following:1/ 50 Hz, 2-pole, full-load rotations-per-minute (RPM) = 2850.2/ 60 Hz, 2-pole, full-load RPM = 3450.Can we extrapolate this information to find out the full-load RPM for other frequencies (i.e.: 20 Hz, 30 Hz, 40 Hz, etc.)?(SPECIFIC EXA... | How to determine full-load RPM of an induction motor at any arbitrary frequency? | electronics | 2017-09-27T18:47:18.747 |
[
{
"message": "I'm using an nrf52 and an OPR5005 reflective optical sensor which takes roughly 20mA. In the design I have only 30mmx30mm space, so only suitable battery is cr2032 or cr2477 so far. The question is how far I can go without switching the sensor on and off? (sensor should be always open)EDIT : Here ... | Going ultra low power with a reflective optical sensor | electronics | 2017-09-27T21:51:38.877 |
[
{
"message": "Question: <a href=\"https://i.stack.imgur.com/aVdaW.png\" rel=\"nofollow noreferrer\">I was asked to use mesh analysis to find the Vx and Ix. I tried that out but got stuck see my working here.please, can someone help show me where I'm getting wrong?<a href=\"https://i.stack.imgur.com/3Ely6.jpg\"... | Find the voltage, Vx, and current, Ix | electronics | 2017-09-28T00:50:05.737 |
[
{
"message": "i am making a pocket power supply and hoping to use it as voltmeter as well using 3 position SPDT switch to choose between power supply, off or voltmeter.<blockquote> [power supply - off - voltmeter]</blockquote>how do i achieve this and make the middle position of the switch to power it off or s... | Proper on-off-on switch wiring advice | electronics | 2017-09-28T11:02:38.373 |
[
{
"message": "I recently bought an AN/PRM-10 multifunction grid dip. After I replaced some electron tubes by new ones, most of the functions seem to work fine, but in the grid dip mode, I get no dip unless I place the coil very near to the resonant circuit to be tested (no more than 2-3 cm). My question for all... | grid dip AN/PRM10: Is the normal operating distance so small? | electronics | 2017-09-28T12:19:14.007 |
[
{
"message": "The book I am reading from (Electronic Devices and Circuits by David A Bell) analyzes the Common Collector circuit by using a H-parameter model as shown.<a href=\"https://i.stack.imgur.com/R1yh5.jpg\" rel=\"nofollow noreferrer\">My confusion is in understanding the output impedance of the transist... | How to calculate the output impedance of the BJT in a Common Collector Amplifier? | electronics | 2017-09-28T14:51:41.010 |
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