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": "UPDATE 1I'm leaving the stuff below intact, even though it's of no interest anymore now I guess: With device M1/RLY1 totally disconnected I thought I'd take a couple more measurements.With the breaker for that circuit (P/N) being live and everything else disconnected I am still measuring at V: P/N... | Measuring apparently fake voltage | electronics | 2018-01-20T20:32:16.747 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f4LTgP.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI want to find out the thevenin equivalent of the circuit across 20 micro farad capacitor as a l... | Problem in Thevenin voltage | electronics | 2018-01-21T05:20:43.657 |
[
{
"message": "I have 6 12v, 6 amp, 60 watt peltier devices and 3 12v, 0.08 amp fans that I want to connect to a 12v, 40 amp, 480 watt power supply. This guy over here:<a href=\"https://www.banggood.com/AC-110V-220V-TO-DC-5V-12V-24V-2A10A15A20A40A60A-Switch-Power-Supply-Adapter-p-1191491.html?rmmds=cart_middle_p... | Wire peltier device and fan to power supply | electronics | 2018-01-21T17:27:21.417 |
[
{
"message": "Recently, I had a problem with two sensors (LDR and LM35), when I tried to read them in Arduino ADC, both measures were totally wrong. Searching in the internet, the answers are related with high impedance of voltage divider provides to analog pin of ADC. So, I used a op-amp to provides a low impe... | Why high impedance source in ADC input causes error? | electronics | 2018-01-21T22:35:02.767 |
[
{
"message": "Regarding my <a href=\"https://electronics.stackexchange.com/questions/351292/a-question-about-remote-ground-sensing-and-its-advantages\">previous question, an unbalanced(single-ended) source Vs is connected to inputs of an instrumentation amplifier and ground as follows: <a href=\"https://i.stack... | A question about an instrumentation amplifier and common mode currents | electronics | 2018-01-22T02:21:37.797 |
[
{
"message": "I would like to design a battery capacity system for my AGM lead acid battery (12v, 40Ah). My idea is that I have values of the battery voltage and its corresponding capacity, which I will use to plot a curve which I can then interpolate with the current voltage reading. I will be measuring the vo... | Designing a battery capacity monitoring system for AGM lead acid battery | electronics | 2018-01-22T03:47:33.573 |
[
{
"message": "In a document <a href=\"http://www.syscompdesign.com/assets/images/AppNotes/probes.pdf\" rel=\"noreferrer\">Hiscocks et al. describes some basics of Oscilloscope probe theory. The document is very understandable and seems coherent. Notice in particular that for him, the bad guy is the parallel cap... | High speed passive probe - contradiction between authors or different points of view? | electronics | 2018-01-22T08:08:11.730 |
[
{
"message": "Why is having a 2 stage flip-flop desirable? Are there advantages of having a master-slave compared to a one stage JK flip flop?",
"role": "user"
},
{
"message": "Well the main advantage for using a master-slave instead of a JK for toggling is the master-slave doesn't allow the output ... | What is the purpose of a master-slave flip-flop? | electronics | 2018-01-22T14:21:37.280 |
[
{
"message": "I have designed a basic Series Regulator which implements fold back current limiting. I wish to simulate this on Proteus software. I am expecting the following graph which shows how the output voltage varies with load current:<a href=\"https://i.stack.imgur.com/z7D6S.jpg\" rel=\"nofollow noreferre... | How to plot voltage vs current graph on Proteus Software? | electronics | 2018-01-22T15:37:47.233 |
[
{
"message": "I want to recognize between blowing or clapping hands with microphone sensor(Arduino Uno) and than with DSP to know which gesture is made.I took a lot of samples but when clapping there is no difference on the output values on arduino(the same like there is silent). thank you.",
"role": "user"... | Recognize blowing or clapping hands with microphone sensor(Arduino Uno) | electronics | 2018-01-22T17:09:45.160 |
[
{
"message": "I am making a circuit which is powered by a lipo battery of 11.1V(3.7V*3). I need to check for the lipo's under-voltage so that the circuit automatically switches to a second lipo when the first one drops below the cutoff voltage. I am open to using arduino and relays but no diodes(as they lead to... | Switching between 2 power supplies upon dropping below cutoff voltage efficiently | electronics | 2018-01-22T17:56:39.743 |
[
{
"message": "I am using 12V , 2A DC power supply as an input to LM338T and LM1085-IT 3.3 , for 5V and 3.3V output respectively.The issue i am facing here is when these both voltage regulators are connected in the circuit , LM338T only gives 1.26V output , which is expected as 5V and LM1085-IT gives 3.3V output... | LM338T Output to 5V issue with LM1085-IT 3.3V | electronics | 2018-01-22T19:18:42.083 |
[
{
"message": "After reading <a href=\"http://www.calex.com/pdf/4ground_shield.pdf\" rel=\"nofollow noreferrer\">an article for floating source wiring I decided to use the following scheme:<a href=\"https://i.stack.imgur.com/xSlUx.png\" rel=\"nofollow noreferrer\">And following that in the below circuit I tried ... | A question about the use of static reference resistor and balancing a floating source for an instrumentation amplifier | electronics | 2018-01-22T19:48:31.383 |
[
{
"message": "I have a circuit like one on scheme. I would like to drive 12V/3A DC motor with PWM from ESP8266 pin output. Circuit works just fine (FET is only little bit heating), but on ESP startup, engine turns on (for less then a second), probably until the pin is initialized with full value (1023 = 3.3 V -... | ESP8266 engine PWM - problem on startup | electronics | 2018-01-22T20:28:31.743 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/1e4CW.png\" rel=\"nofollow noreferrer\">D1 and D2 are ON (short)<br>D3 is OFF (open) My goal is to find a relation between Vin and Vout without using currents in the equation. I thought of applying KVL on a loop that includes the upper wire of the small loop (o... | Are the two resistors R1 and R2 in parallel? | electronics | 2018-01-23T03:37:43.327 |
[
{
"message": "I've got this timer (TIM4) that's in PWM mode. I'm outputting one PWM channel and i want to wait a bit, and then grab the latest ADC samples from a DMA conversion.TIM4 -> ARR is 4096TIM4 -> CCR1 is dynamic, but it starts around 200I want to start at the rising edge of the TIM4 pulse, wait half th... | How to dynamically adjust a timer with STM32 | electronics | 2018-01-23T06:35:40.373 |
[
{
"message": "When I have 6 gears on the DALI bus, how to set up a pair of two to the group by command?or another way to set?thanks!",
"role": "user"
},
{
"message": "Command 96 Add To Group 0, for example. This would need to be sent twice within 75ms because it is a configuration command, and you w... | How to set the group in DALI system on the bus? | electronics | 2018-01-23T12:05:17.223 |
[
{
"message": "I'm trying to display a 4-bit binary number on a 7 segment LED as a hexadecimal number (0-F). I have an assortment of 7400 series ICs including the 7447. But that one only works for BCD (0-9). The 7400 series doesn't seem to have a hex to 7-segment decoder and I don't have one on hand.So I figure ... | 7 segment binary to hex | electronics | 2018-01-23T12:29:28.310 |
[
{
"message": "Two single-ended output transducers Tr1 and Tr2 are powered from the same power supply and their output is connected to shielded twisted pair. Their ground and the shield connected at the source ground which is recommended. The transducers' grounds are internally connected to their DC power ground... | Is this loop problematic for the analog readings? | electronics | 2018-01-23T12:37:04.240 |
[
{
"message": "I have a simple current mirror and am trying to find the output resistance in OrCAD. Somewhere I saw: $$R_O=r_{ds}={1\\over g_{ds}}$$ Using this formula and the SPICE bias file, I get a theoretical output resistance of \\$22.17 k\\Omega\\$. I then gave my output an AC voltage input of 1.5 V (the a... | Output resistance with no lambda SPICE parameter | electronics | 2018-01-23T21:48:52.607 |
[
{
"message": "I am trying to bulid the following circuit that work as solar power charging controller. Unfortunately, I couldn't find IC1 named as TLC2272CP that works as dual low-noise rail-to- rail Operational Amplifier exhibits rail-to-rail output<a href=\"https://i.stack.imgur.com/bbO56.jpg\" rel=\"nofollow... | solution to replace tlc2272cp ic | electronics | 2018-01-23T22:39:24.400 |
[
{
"message": "I understand how to program ADF5356 on the evaluation board<a href=\"http://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-ADF5356.html\" rel=\"nofollow noreferrer\">http://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boa... | How to program/configure ADF5356 with out using the evaluation board? | electronics | 2018-01-24T01:17:11.953 |
[
{
"message": "<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2faOdVj.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabHi,I want to make a Transistor based Push Pull Stage to drive a 30V Mosfet.uC GPIO drives the tr... | Transistor Push Pull Stage to drive Mosfet | electronics | 2018-01-24T14:52:43.020 |
[
{
"message": "*I searched about the correct oscilloscope and probe to measure the a signal with a certain frequency. I read some documents and white papers about this topic. I have heard some \"rule of thumbs\" about the measurements : You should use scope and probe with a BandWidth of at least 5 times the Band... | The probe and Oscilloscope selections for measurement | electronics | 2018-01-24T19:18:28.387 |
[
{
"message": "So I have a PTZ camera and a siren. What I'm trying to do is trigger the siren when the camera detects motion.The camera hooks up via PoE, but the siren just has a 12 volt connection, so it has to be triggered by another device. The camera has the ability to send out an SNMP trap when it detects m... | Device for toggling power to another device via raspberry pi GPIO? | electronics | 2018-01-24T22:58:49.167 |
[
{
"message": "I want to design a circuit using the LTC3108 low voltage step-up converter. The data sheet (pg.18 -Peltier-Powered Energy Harvester for Remote Sensor Applications-) calls for a LPR6235-752SMLB inductor. Since the supplier that I'm using doesn't have that part in stock, so I have to find another pa... | Circuit using LTC3108, inductor selection | electronics | 2018-01-25T07:45:18.583 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/cWEyR.jpg\" rel=\"nofollow noreferrer\">Every time that I plug my Arduino into the computer, this chip immediately gets burning hot, way too hot to touch, this wasn't something that i noticed happened after a particular event, I just noticed it one day. On the c... | Why does this component on my Arduino UNO heat up? | electronics | 2018-01-25T09:33:38.920 |
[
{
"message": "I am creating a circuit which will be used in an Engine Management system. Its function is to:a) either drive a 12v ignition coil directly (using a normal IGBT)b) or if required, offer instead a 5v TTL 'trigger' outputI have sketched out a diagram.I believe 'switch' section A can be accomplished b... | TTL or IGBT Output - software switchable | electronics | 2018-01-25T15:44:12.880 |
[
{
"message": "I am creating a circuit which will be used in an Engine Management system. Its function is to:a) either drive a 12v ignition coil directly (using a normal IGBT)b) or if required, offer instead a 5v TTL 'trigger' outputI have sketched out a diagram.I believe 'switch' section A can be accomplished b... | TTL or IGBT Output - software switchable | electronics | 2018-01-25T15:44:12.880 |
[
{
"message": "A single-ended source is connected to an inAmp of a data-acquisition board as follows:<a href=\"https://i.stack.imgur.com/dF2Ut.png\" rel=\"nofollow noreferrer\">As you see above, the shield is shielding the twisted shielded pair cable. The shield is tied only to the earth ground. AIGND is not con... | Need help modelling the circuit with parasitic capacitance of a power supply in this scenario in SPICE | electronics | 2018-01-25T16:59:04.877 |
[
{
"message": "I have an overall that I want to shut off completely with a flick of a switch; however, the system I want to shut off is comprised of two smaller, completely separate systems. Let me give you an example, <a href=\"https://i.stack.imgur.com/szar3.png\" rel=\"nofollow noreferrer\">If you can see, th... | Trouble with Turning Off/Powering Off two systems at once, how should I approach this? | electronics | 2018-01-25T17:09:55.610 |
[
{
"message": "All simulations I've done in simulink as yet have not matrix in their block diagram like the following picture :<a href=\"https://i.stack.imgur.com/iWU7s.jpg\" rel=\"nofollow noreferrer\">and they have block diagram structure like :<a href=\"https://i.stack.imgur.com/uGH23.jpg\" rel=\"nofollow nor... | Using of matrices in simulink block diagrams | electronics | 2018-01-25T19:06:36.997 |
[
{
"message": "I'm working on making improvements to an old project I helped design. The project used an Arduino to take measurements from six sensors to measure the strength of a nearby electromagnet that generated 10 teslas. Now, for this new version, I'm trying to see what kind of improvements that can be don... | Realistic Magnetometer Specifications | electronics | 2018-01-25T19:36:05.773 |
[
{
"message": "I am trying to sense current at high side through a load using MAX4172 IC. I have set Rsense and Rout in such a manner to get 1 uA -> 0.1 V. I am also controlling transistor (common emitter config) to indicate 0 V and 2.5 V under certain current values. Under no load condition i am getting getting... | Unstable current sense output (MAX4172) | electronics | 2018-01-25T20:01:17.120 |
[
{
"message": "This is possibly a pedantic question but im not sure what makes the most sense.I have this relay : SRD-05VDC-SL-C - the one seen here: <a href=\"http://www.circuitbasics.com/setting-up-a-5v-relay-on-the-arduino/\" rel=\"nofollow noreferrer\">http://www.circuitbasics.com/setting-up-a-5v-relay-on-t... | Relay - should low or high be used for 'On' best practice | electronics | 2018-01-25T23:06:18.143 |
[
{
"message": "I would like to warm a glass jar to 27°C and maintain this temperature using a miniature digital thermostat. The thermostat is 12V DC and will support up to a 12V 10A load. Its pre-made and comes with a temperature sensor.Limitations:The jar must be warmed slowly and consistently. Ideally the wire... | I need to gently warm a wire from room temp to 27degC with a 12v mains adapted power source | electronics | 2018-01-26T04:50:42.617 |
[
{
"message": "I was wondering if someone could help me understand why this instrumentation amp isn't working the way I think it should. The amp is an INA155.My intention is that at if a voltage (positive or negative) is applied across the input pins, I should see the same value, multiplied by 10 (since this amp... | Need help with instrumentation amp behaviour | electronics | 2018-01-26T19:46:48.303 |
[
{
"message": "I apologize but I know jack about this stuff and this is probably a simple question I can’t seem to figure out. I have 12 volt power supply, a 3 wire unipolar Honeywell SRC3-A1 4.5-24 volt hall sensor but only puts out 380-400mv on the supply line and I need it to power a crydom DC60S3 solid stat... | How to increase hall sensor voltage | electronics | 2018-01-27T06:36:12.970 |
[
{
"message": "I'm just trying to work out the rules for this. I have 2x 9v motors running through an L293dne which may run together, one at a time, and/or, at different speeds using PWM. I'm thinking an 18v battery with a 9v buck converter on each circuit would do it but can someone confirm this please? Is ther... | Powering 2 dc motors. | electronics | 2018-01-27T09:59:35.760 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/ZTwej.jpg\" rel=\"noreferrer\">I have an enclosure, and want to fix/put a STM32 inside, a relay and probably later a small circuit board.However, the STM (STM32F103C8T6) and the relay do not have holes to fix them... and I do not want to glue them because maybe ... | How to 'fix' this in an enclosure without glueing? | electronics | 2018-01-27T16:13:08.230 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/ZTwej.jpg\" rel=\"noreferrer\">I have an enclosure, and want to fix/put a STM32 inside, a relay and probably later a small circuit board.However, the STM (STM32F103C8T6) and the relay do not have holes to fix them... and I do not want to glue them because maybe ... | How to 'fix' this in an enclosure without glueing? | electronics | 2018-01-27T16:13:08.230 |
[
{
"message": "I am trying to develop a Wall Following robot without using a micro controller. Is there any way I can maintain a fixed distance from the wall using Ultrasonic Sensor HC-SR04 without using Arduino.",
"role": "user"
},
{
"message": "if the PWM frequency is fixed you can convert the PWM ... | Wall following Robot without MicroController | electronics | 2018-01-27T17:58:51.183 |
[
{
"message": "I'm quite interested in this rather simple transmitter design called the Michigan Mighty Mite, described here:<a href=\"https://makerf.com/posts/mighty_simple_shortwave_transmitter\" rel=\"nofollow noreferrer\">https://makerf.com/posts/mighty_simple_shortwave_transmitterI'm familiar with resonant ... | Understanding the Michigan Mighty Mite | electronics | 2018-01-27T19:24:15.160 |
[
{
"message": "EDIT: Edited in response to question in comment (1)I'm trying to work through some examples from Carmine Noviello's book, Mastering STM32. In the chapter introducing timers, I adapted his very first example and am getting an \"undefined reference\" error for the function <code>HAL_TIM_Base_Init</... | STM32 Simple Timer in Eclipse | electronics | 2018-01-27T23:16:31.873 |
[
{
"message": "I am making a breakout board for Silabs EFM8BB1 (Busybee). I have made the schematic but am unsure about the C2 Debug Interface. Can someone guide me please?<a href=\"https://i.stack.imgur.com/Y9YwR.png\" rel=\"nofollow noreferrer\">",
"role": "user"
},
{
"message": "You seem to be fol... | Breakout board for EFM8BB1 | electronics | 2018-01-28T16:41:13.040 |
[
{
"message": "I have a digital output, driven by the high-side driver with nominal voltage of 24V DC. The load current normally is below 100 mA. The output is monitored, so I can switch it off quickly if I detect a short circuit at the load side. The problem is that the driver itself is not protected and short-... | Simplest, cheapest, fast and minimum footprint current limiting circuit with low resistance in normal state | electronics | 2018-01-28T19:40:15.193 |
[
{
"message": "I am trying to calculate the differential impedance of a differential pair in a 4-layer PCB as follows:Layer: Low speed signalLayer: Power planeLayer: Differential pairLayer: Ground planeI am currently using Saturn PCB Toolkit, may I know which settings should I consider:Edge Cpld Ext (Microstrip)... | Is there available differential impedance calculation for this stripline configuration? | electronics | 2018-01-29T01:35:46.240 |
[
{
"message": "I'm trying to find the Norton equivalent with respect to the load resistor RL for the DC circuit below.<a href=\"https://i.stack.imgur.com/XPyux.jpg\" rel=\"nofollow noreferrer\"> Each of the resistors have an equal resistance R. Removing the load resistor, I am having a lot of trouble figuring ou... | Norton equivalent with a single voltage source | electronics | 2018-01-29T05:04:06.487 |
[
{
"message": "I have a LCD driver board and it uses LM2576 for voltage regulation/step-down. As being cheap ebay/aliexpress purchase the instructions state 12V DC input without specifying range. Datasheets I found for LM2576 state unregulated input voltage can be up to 40V.So the question is whether the LCD dri... | LM2576 in car environment | electronics | 2018-01-29T07:56:16.100 |
[
{
"message": "I am investigating a linearised common-emitter circuit of the form:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fCUBEU.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI am interested in the isolat... | Why do two transfer functions of a circuit have same denominator? | electronics | 2018-01-29T08:23:06.410 |
[
{
"message": "The next schemtaic I was found as an input stage of ultra-linear phono amplifier.<a href=\"https://i.stack.imgur.com/LDNTe.png\" rel=\"nofollow noreferrer\">What are the benefits of that type of biasing? I don't see that 12V zener has 12V voltage drop on it (only 4.2V) and in this situation how I ... | What are the benefits of this type of JFET biasing | electronics | 2018-01-29T08:27:56.750 |
[
{
"message": "I have an spartan 6 board. I need a flash memory with USB interface(like transcend, Silicon power,... ) to save some data to my board user. I haven't any idea about transfer speed. I need about 13 MByte/s. This is available on windows data transferring to flash memories. Is it available for me on ... | Spartan 6 and flash memory data transferring | electronics | 2018-01-29T12:39:52.930 |
[
{
"message": "In the following circuit how does the zener diode D1 provide reverse polarity protection?<a href=\"https://i.stack.imgur.com/KEely.png\" rel=\"nofollow noreferrer\">Lets say V+=12V and V-=-12V and the zener is 36V zener. It means for correct polarity zener will not pass any current since it sees 2... | How good is to use this zener diode for reverse polarity protection? | electronics | 2018-01-29T12:57:52.790 |
[
{
"message": "I have two USB2512BI-AEZG(<a href=\"http://ww1.microchip.com/downloads/en/DeviceDoc/00001692C.pdf\" rel=\"nofollow noreferrer\">datasheet) ICs and would like to drive them using only one external crystal for well known reasons.What is misleading me is ultra low input low voltage specified in the d... | USB2512 - Too low input voltage in datasheet | electronics | 2018-01-29T14:55:04.337 |
[
{
"message": "In studies of Digital Circuits or Digital Electronics or Digital Systems, the very first step is to convert an Analog signal / Analog system into a Digital Signal / System.<a href=\"https://i.stack.imgur.com/bqD38.jpg\" rel=\"noreferrer\">In this process of converting an Analog function to a Digit... | In digital systems do we discretize both time and magnitude or only time? | electronics | 2018-01-29T15:34:44.370 |
[
{
"message": "In studies of Digital Circuits or Digital Electronics or Digital Systems, the very first step is to convert an Analog signal / Analog system into a Digital Signal / System.<a href=\"https://i.stack.imgur.com/bqD38.jpg\" rel=\"noreferrer\">In this process of converting an Analog function to a Digit... | In digital systems do we discretize both time and magnitude or only time? | electronics | 2018-01-29T15:34:44.370 |
[
{
"message": "I am generating a 0-5 volt sine wave using an arduino with a DAC.I would like to level shift this signal (DC bias?) by -2.5 volts and have a gain of .8, so that I end up with a line level sine wave.Thus I am trying to design a single supply op amp with the following equation:$$V_{\\text{o}} = (V_{... | Single supply op amp to convert 0-5VDC to +/-2VDC (microcontroller to line level) | electronics | 2018-01-29T15:37:54.243 |
[
{
"message": "On the image below you can see an inverting amplifier with input capacity C1 and capacity C_F for general stability. <a href=\"https://i.stack.imgur.com/CGxFz.png\" rel=\"nofollow noreferrer\">Now my book shows me following frequency plot:A_n ... Noise-GainA_D ... open-loop gainA_U ... V_out / V_i... | Why does input capacity of an opamp increase noise gain? | electronics | 2018-01-29T15:41:29.460 |
[
{
"message": "My understanding is that SEPICs, Cuks, and Zeta converters all provide a stable output voltage despite an input voltage that can vary either above or below what is desired. The SEPIC and Zeta maintains the same polarity, while the Cuk reverses the polarity but by making an isolated version you can... | SEPIC vs Cuk vs Zeta Converter | electronics | 2018-01-29T15:50:29.967 |
[
{
"message": "I'm curious to know why 'Z' was chosen to represent high impedance state for types such as used in VHDL and VHDL-AMS's std_logic_1164 logic system:<a href=\"https://i.stack.imgur.com/r2TKJ.jpg\" rel=\"nofollow noreferrer\">(image of page 789 of <a href=\"http://a.co/098Ij3O\" rel=\"nofollow norefe... | History of choice of 'Z' to represent high impedance? | electronics | 2018-01-29T16:28:26.153 |
[
{
"message": "I understand that it's possible to use the headphone port of a laptop as a microphone, but what are the physical limitations to using any speaker in the same way?I'm curious about what makes amplification a one way street and if it is necessarily always the case.",
"role": "user"
},
{
... | Is there any reason that any speaker connected to any computer couldn't be used for listening/surveillance? | electronics | 2018-01-29T16:48:43.447 |
[
{
"message": "I have a couple of <a href=\"http://pdf1.alldatasheet.com/datasheet-pdf/view/66281/INTERSIL/AD7545JN.html\" rel=\"nofollow noreferrer\">AD7545JN DACs that I want to drive some proportional vales with, using an Arduino Mega.My main problems is that I'm only getting about 8V at OUT1 of it with Vref ... | AD7545JN problems | electronics | 2018-01-29T17:40:45.830 |
[
{
"message": "I've come across the Shannon-Hartley theorem, so I assume that a \"signal\" must have some notion of strength or \"power\" that can be referenced to some noise level (and whose power can be varied at the signal source). But what form does that power take on a coaxial cable?E.g., is it a maximum v... | How is "signal strength" characterized on a coaxial cable? | electronics | 2018-01-29T20:41:29.803 |
[
{
"message": "I have a PCB that I use to make some measurements on a proprietary silicon chip. We are including a number of test structures on the PCB to allow for some automated tests, for example relays that open/close some connections, analog multiplexers that allow the sensing of certain pins of the chip, a... | How to preset an I2C IO expander | electronics | 2018-01-29T21:31:35.900 |
[
{
"message": "I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (a cheap 650nm, 5mW diode) according to the audio output of my phone. The laser is then received by a photo-resistor (G5528 A205) wired up to the microphone socket of my lapt... | Improving the quality of an optical audio transmitter | electronics | 2018-01-29T21:53:29.090 |
[
{
"message": "Newbie here regarding contactors and relays, i had this contactor datasheet <a href=\"https://www.gavazzionline.com/pdf/CC50-CC65.pdf\" rel=\"nofollow noreferrer\">https://www.gavazzionline.com/pdf/CC50-CC65.pdf. I'm trying to identify how long the contactor would last and I find the durability ca... | About Contactor Lifespan | electronics | 2018-01-30T02:13:35.187 |
[
{
"message": "I want to control several Mosfets through a microcontroller. I have a low-power application in mind, therefore the power consumption should be minimized.When do I need a Gate-Source-Resistor, and when not? How to calculate the value for minimum power consumption?Regarding the gate resistor, Does i... | MOSFETs: Gate-to-Source resistor and Gate resistor value calculation | electronics | 2018-01-30T15:59:43.177 |
[
{
"message": "I've the following circuit:<a href=\"/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f2aZaZ.png\">simulate this circuit – Schematic created using <a href=\"https://www.circuitlab.com/\" rel=\"nofollow\">CircuitLabI know that the relation between the input voltage and the input curr... | Question about the RMS value of the real input power | electronics | 2018-01-30T17:20:35.190 |
[
{
"message": "Currently I have a setup where a 433MHz Transmitter sends a number from one arduino and a 433MHz receiver picks it up for another arduino. The Transmitter and receiver are of the Super Regenerative type if I'm correct (picture below).<a href=\"https://i.stack.imgur.com/nPdcy.jpg\" rel=\"nofollow n... | 433MHz receiver compatibilty | electronics | 2018-01-30T18:48:57.717 |
[
{
"message": "I understand that from KVL e = v -IaRa e=k(flux)speed speed=(constant)*(V-IaRa)/flux But physically what causes the speed to increase? What force causes the rotor to accelerate? In fact, physically, the rotor is moving because of field flux interacting with armature current's flux. So physically i... | Why does speed of DC motor increase when flux is reduced? | electronics | 2018-01-31T09:17:14.137 |
[
{
"message": "I need to take the controller board from a 2-cell battery (2 x 3.7v) to a single power supply (1 x 7.4v). The board has 3 wires, \"B+\", \"B-\" and \"BC\". The two cells are wired in series to \"B+\" & \"B-\" and the piece of wire that acts as a bridge, is also directly connected to \"BC\". S... | Wiring this 2-cell battery controller to 1-output psu? | electronics | 2018-01-31T11:11:57.320 |
[
{
"message": "Regarding the following schematic for a bi-directional logic level converter, can someone explain how to calculate power consumption? Can I use pullup resistors with higher values, e.g. 1M?I need such a converter in my circuit, but the device is battery operated and should therefore consume as lit... | Logic-Level Converter: How high is the power consumption? | electronics | 2018-01-31T12:45:31.353 |
[
{
"message": "I've come into possession of a bunch of xenon flasher units of the type commonly mounted to burglar alarms and electric gates. I'm aiming to turn them into tiny strobes as part of a project I'm working on; this means increasing their flash rate from their current rate of ~1 flash per second to sev... | Increasing flash rate of xenon flasher | electronics | 2018-01-31T14:28:06.693 |
[
{
"message": "I want to use a MOSFET as a switch driven by my microcomputer.<a href=\"https://i.stack.imgur.com/aqDwX.png\" rel=\"nofollow noreferrer\">The original circuit using N-channel MOSFET is on the left side. Honestly, I do not understand the choice of the IRLZ44. The circuit is designed for Arduino, ... | p-channel MOSFET switch | electronics | 2018-01-31T15:53:03.997 |
[
{
"message": "I am trying to create an Arduino based music synthesizer.How can I safely generate line level output (+/- 2 volts centered at zero, with a frequency range from 20Hz-20KHz) from my Arduino using a minimal number of components?This is what I imagine the flow will look like, but please correct me if ... | What kind of signal processing circuitry do I need to generate a line level output on an Arduino? | electronics | 2018-01-31T17:50:33.850 |
[
{
"message": "I've been banging my head on this project for a while and need some guidance. It is a magnetic levitation device that is used in control theory class. I've never taken the class so have been trying to learn it through online courses and books. I think I get some of the basics but not enough to fig... | Characterizing a magnetic levitiation system | electronics | 2018-01-31T22:17:30.470 |
[
{
"message": "Would a Fluke 87V meter be able to run on a 9V Li-ion rechargeable battery capable of 550mAh?In general (for any device), what information (device specifications) would I need in the future in order to be able to answer this sort of question? Current? Power consumption (how long a battery lasts in... | Would I be able to use a rechargeable battery in a Fluke 87V (based on specifications)? | electronics | 2018-01-31T22:57:52.907 |
[
{
"message": "The question is, does a RF frequency multiplier work with ultrashort pulses? In another words, does the frequency multiplier change the pulse width of input signal?For example, suppose we have a analog signal oscillating at 100MHz and it was amplitude modulated to be a 50ns-width Gaussian-shape si... | Does a RF frequency multiplier work with ultrashort pulse? | electronics | 2018-02-01T00:47:07.803 |
[
{
"message": "I am designing a PCB with RF (~3 GHz), analog/mixed-signal (ADC, DDS) and some high speed digital lines (ADC outputs, DDS input; ~100 MHz).There are very few RF lines which I can have on one layer.But digital may be more which I need to route in different layers.I decided to use just one single gr... | Choosing the right stackup for 6 or 8 layers | electronics | 2018-02-01T01:32:44.610 |
[
{
"message": "As a school project I want to write a very simple controller for a flash memory in a IC board. The FPGA chip is Altera 5CEFA4F23C8 and the flash is MX25L3206E.I did an effort to produce the SCLK, SI and other signals that the chip needs through verilog, respecting the timing etc. I conceived the c... | Sending SPI signals to the Flash Memory through verilog FPGA controller, but not receiving anything from it, why does it happens? | electronics | 2018-02-01T06:33:01.307 |
[
{
"message": "Recently,i read some paper,and some of paper said :To reduce the power consumption of VLSI,Supply voltage has decreased to the subthreshold voltage,and the subthreshold circuits consume a very low power,but suffer from the speed degradation due to the low current-driving capability of transistors,... | Qustion about subthreshold voltage and driving capability | electronics | 2018-02-01T14:17:39.173 |
[
{
"message": "A 24V SMPS power supply is used to create a +/-12V bipolar supply.This bipolar supply then powers this <a href=\"https://www.crlsensors.com/prodDocs/sa-107lnc.pdf\" rel=\"nofollow noreferrer\">accelerometer transducer which converts small mechanical vibrations to amplified voltages.<a href=\"https... | Some questions about power supply noise and transducer wiring | electronics | 2018-02-01T16:55:15.500 |
[
{
"message": "I'm using a Conrad DCF77 to get RTC on Beaglebone Black and wiring it so: 1--> GND |2--> VCC 3,3 V |3--> One of the gpios (P8_11)To read the Signal of the DCF Antenn I wrote the code:<pre><code>import Adafruit_BBIO.GPIO as GPIOimport timeGPIO.setup(\"P8_10\", GPIO.OUT)while True: new_switch_st... | DCF77 - No Signal detected | electronics | 2018-02-01T17:30:28.577 |
[
{
"message": "After 40+ years you would think I would know this, somehow it never came up, but for the life of me I don't see it.<a href=\"https://www.jameco.com/Jameco/Products/ProdDS/38359.pdf\" rel=\"nofollow noreferrer\">Typical transistors specs list a plethora of values but one that always seems to be mis... | Missing BJT parameter, \$I_b\$ max | electronics | 2018-02-01T19:06:19.460 |
[
{
"message": "I have a number of awkwardly shaped connectors that I need to cram into a single PCI Express slot metal bracket without any of them colliding with the host PC case's metalwork. The connectors are a mixture of proprietary and standard.<a href=\"https://i.stack.imgur.com/r1iXt.jpg\" rel=\"nofollow ... | What is the usable area (for connectors) of a PCI Express card bracket? | electronics | 2018-02-01T19:14:36.033 |
[
{
"message": "I am designing a flyback driver using a salvaged power transistor that was originally the driver transistor of a flyback in a ctr screen.This power transistor is the 2SC5681I want to drive this transistor with an IC, and the high base current required by this transitor (1-2A) cannot be directly su... | Negative base current | electronics | 2018-02-01T21:22:51.003 |
[
{
"message": "Can anyone calculate the cut-off frequency and tell me which formula to be used on the Positive end of OPAMP?what is the role of R1 here and R7 from the feedback?Please answer in details with resistance calculation, so that I can understand.I suppose... Fc = 1 / [ ((R5||R1)||R7)+R2 ] * C1 x 2 * Pi... | Cut-off frequency calculation | electronics | 2018-02-02T13:41:54.260 |
[
{
"message": "I know there are several other threads with similar questions, but my requirements are different. So far I couldn't find a solution even though I read through several of these topics.My circuit is normally powered with a 3V coin cell battery. I would like the circuit to be powered by USB as soon a... | Switch between 3V battery and 5V USB as power source | electronics | 2018-02-02T18:02:46.333 |
[
{
"message": "The flow of current in a (semi-)conductor is often described as holes and/or electrons moving between atoms. In this context:Is an atom with a hole the same thing as a positive ion (cation), andIs an atom with an electron the same thing as a negative ion (anion)?I already understand what cations a... | Is a hole in a conductor the same thing as a positive ion? | electronics | 2018-02-02T18:45:43.190 |
[
{
"message": "I am evaluating this code below.But I saw that the logic output of the RTL and Technology Map Viewer are different.I use Quartus Prime Elite Edition.Am I missing something?this is the truth table<pre><code> RTL Technology MapA (NOT A) p_a ((A X... | Synthesis Result : RTL vs Technology Map Viewer | electronics | 2018-02-02T23:04:22.933 |
[
{
"message": "I rigged up a tiny little project using a scrap Dell keyboard, where I tore the keyboard apart and salvaged the USB control board. The actual keyboard is gone. Then, I traced the circuit for the \"Enter\" key on the keyboard, to figure out exactly which combination is needed to close the circuit t... | Simulating keyboard strokes with shortcut key combinations | electronics | 2018-02-03T01:25:54.880 |
[
{
"message": "Is it possible to use some sort of sensors (or if anything else is better please tell) to obtain a football's position within the goal posts?<a href=\"https://i.stack.imgur.com/FIoY9.png\" rel=\"nofollow noreferrer\">What I am trying to achieve is the position of the ball as a goal is scored. Then... | Using sensors to get a ball's position | electronics | 2018-02-03T14:05:37.373 |
[
{
"message": "I have a board, which has some pcb buttons. I want to bypass the buttons and have one of my raspberry pi handle it. Here is a picture of what I'm talking about<a href=\"https://i.stack.imgur.com/c6lyd.png\" rel=\"nofollow noreferrer\">I dismanteled this button to test, it's not that one that I ult... | PCB buttons how to | electronics | 2018-02-03T21:43:52.440 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/1RDB7.png\" rel=\"nofollow noreferrer\">I am trying to build an amplifier to allow a cheap electret boom microphone to be used with an aircraft radio, but am unsure how to increase the gain to a usable level.I derived the attached design from experimentally tryi... | Increase gain of electret microphone amplifier powered by aircraft radio? | electronics | 2018-02-03T22:11:14.537 |
[
{
"message": "Context:I am a beginner tinkerer at electronics. Conceptually a lot of this is hard for me. But, I plod on. I very much like to use free salvaged components for all sorts of projects, and continue that by salvaging parts for electronics learning/projects.I have what was a solar-charging sensor-act... | ReqForHelp: Understanding Vf relationship to supplied V and A | electronics | 2018-02-04T05:16:40.610 |
[
{
"message": "When I say more power, I know that fundamentally it takes more energy to move the speaker cone to produce lower frequency audio. However, in my experiences, higher frequency content takes up something like x10 less current than its lower frequency counterparts, and this is using similar impedance ... | Why does low frequency audio take up more power | electronics | 2018-02-04T10:40:25.307 |
[
{
"message": "I'm trying to build an internet-connected button. When button is pressed, WeMos D1 turns on, makes a network call and then cuts off the power by pulling the <code>irlb8721</code> gate to <code>LOW</code>.Video: <a href=\"https://photos.app.goo.gl/QEpIgPa3gxHatTyG3\" rel=\"nofollow noreferrer\">htt... | WeMos self-turn-off with N-channel MOSFET | electronics | 2018-02-04T12:06:28.573 |
[
{
"message": "Has anybody used ltspiceIV in a optimization process using Matlab? I need feedback because I am running my circuit in transient analysis, and when I found the optimal point of my optimization, I ran it again but alone (not in the optimization loop) and I don't get the same values. Also, in a for l... | ltspice matlab optimization | electronics | 2018-02-04T13:55:11.853 |
[
{
"message": "According to the data sheet these devices should be capable of handling 163A source to drain (though I have my suspicions that those little leads might not be up to that particular job). I bought ten of these devices from China for just over two pounds sterling, which is already suspicious but che... | IRF1404 MOSFET fake? | electronics | 2018-02-04T18:43:09.313 |
[
{
"message": "I need to establish an ethernet connection between a host and mbed, where the host can send commands to the mbed (e.g. move forward, move backwards, stop, etc). As there is no telling when these incoming commands might be received, would it be advisable to keep my Socket code in a separate thread,... | mbed Socket Thread | electronics | 2018-02-04T19:17:42.700 |
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