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7 views

Circuit for measuring low current output from a high voltage input

I am trying to design a DC circuit that allows a. high input voltage of about 1 to 20kV and I can measure a low current output of about 1nA to 10mA. This is my approach but I need feedbacks. I want ...
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0answers
11 views

How to create a Preamp that is ON when input is a MIC but OFF when a LINE level?

My question is very simple: Is there a way to create a Preamp circuit that is automatically ON when there is a MIC connected (for example, a desktop PC microphone) ...
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0answers
12 views

Open and short test for 2 ground pin

If a device has two ground pins. Using the normal open and short test will not tell if one ground pin is open and the other is good. How to detect this kind of situation? Thanks.
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0answers
15 views

How to display Keyboard's binary to Digital waveform

how can i display to a monitor a digital waveform of any key when pressed in a keyboard. I was thinking to use arduino or rasp For example, i pressed the small letter 'a' in keyboard (equivalent to ...
2
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0answers
23 views

Why aren't there many (voltage controlled) variable capacitors above ~1000pF?

I was looking into finding a variable capacitor to implement in a closed-loop self-tuning RF circuit and I noticed there aren't many options above 1000pF and I got curious. Do they not exist because ...
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0answers
10 views

Can we use nodemcu in real-time projects

I have been working on some small iot projects using nodemcu. So I have an idea to make those nodemcu projects into real-time . The places like home, office, school
2
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2answers
45 views

What does “For disconnect use only” mean on a connector?

I recently bought some Andersen connectors for connecting high-amp devices to my camping setup in my truck. The idea is they hold together through much rougher conditions than a regular cigarette ...
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0answers
11 views

Improve the performance of Buck Converter Loop Stability

The following are the specifications of my Buck Converter. Input Voltage Range : 6V to 16V Output Voltage : 5V Switching Freq : 2.1MHz Output Inductor : 22uH Minimum Load Current : 200mA Typical ...
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0answers
8 views

Using FMC SMA module

I am using FMC_SMA Module to use the GTX transceiver of Genesys-2 Kintex7 FPGA board. As specified on the website of FMC_SMA Module, there is a place holder for Si570 oscillator on the FMC_SMA Module. ...
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0answers
33 views

Questions on ringing over square wave in transmission line

Considering a transmission line with open circuit termination at one end and a square wave voltage source with impedance not matching the characteristic impedance at the other end. Because of ...
0
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0answers
13 views

RMS Current & Average Current Questions

I understand that: For purely DC current with fixed DC voltage, the DC & RMS current value will be the same, means that the total power RMS & DC will be the same using Pdc = Idc x Vdc For ...
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0answers
11 views

Troubleshooting fried FPV receiver hooked up to SPDT switch

I want to be able to charge a FPV Receiver (specs) via a phone and charge the phone with a battery. I tried using a single pole double throw switch without the power source connected to the phone ...
0
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1answer
21 views

Driving an led with usb cable connected to computer

I checked that the usb port from my laptop gives 5v so i want to start from there first. I am currently running a 3mm, two legs standard led. I am using a 100ohm resistor so that the led doesnt burn ...
0
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1answer
32 views

Test transformer with signal generator and oscilliscope

I would like to see how well a sine wave would pass thru a transformer. (from primary side to secondary) Is it possible/practical to test small transformers which you might find in small low powered ...
0
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0answers
13 views

I am not able to get any response from ST25RU3993 via arduino SPI

I ran out of clues of what could be stopping me from driving the ST25RU3993, hopefully I can get some useful directions from here... I am trying to drive the ST25RU3993 Eval board using SPI, with my ...
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0answers
8 views

Low resistance fuse selection for BMS voltage tap

I want to put inline fuses on the voltage taps of a battery bank I'm assembling. The BMS (Orion Jr) documentation requires a fuse with current rating of no more than 3A for the voltage taps, and ...
0
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0answers
26 views

Odd Problem and Question [migrated]

I have had a problem that had stumped me consistently. I have a 2005 sebring that has been intermittently going into limp mode. I checked the code and it told me the tranny control module power relay ...
0
votes
1answer
18 views

What is limiting my BLDC Motor power Output?

I am using a BLDC 3 phase hub motor and recently installed a motor controller rated for 3000watt (I originally had a 1200Watt controller installed). The motor is rated for 500w nominal 800w peak but ...
1
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0answers
25 views

wiring usb cables for powering multiple devices via a bus terminal

Hi all, I have a created a home brew cable to power up a monitor and a raspberry pi zero, and I have blown up a capacitor on the monitor card, and I have no idea why :( First question: Why did the ...
1
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2answers
39 views

Why are motor poles oriented radially rather than tangentially?

I wonder why motor poles aren't oriented tangential to the sphere of rotation of the motor (for brushless DC motors). It seems like radially oriented motor poles would be less efficient when the ...
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0answers
15 views

Trouble debugging code on an STM8TL52 microcontroller using the STVD IDE

I'm trying to debug some code running on an STM8TL52 microcontroller using the STVD IDE with the chip's SWIM interface. For some reason, it just hangs on a line of code (a simple a variable increment) ...
1
vote
1answer
42 views

Difficulties with capacitor circuit analysis

I have been given this question by one of my lecturers and have been having difficulty with it. I was wondering if anyone could help me. In the circuit of Fig. 1, switch SW1 has been closed, and ...
1
vote
2answers
82 views

How do computers execute instructions spanning multiple clock cycles?

There are some(or most) instructions in a computer that simply cannot be executed in a single clock cycle. But there lies a problem. How does the program counter in the computer know when an ...
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0answers
34 views

Current source with such low noise even possible?

I am thinking about how or if it is even possible to build a particularly low-noise voltage-controlled DC current source. I need currents of up to 1.7 A (DC) while keeping its output noise below 1.7 ...
0
votes
1answer
20 views

Is there a way to place all parts of a connector at once in Altium?

I have a part with 50 pins and currently it only allows me to place one pin at a time. Is there a way to do that quicker? Currently I have to place one pin and then right click it to change it to part ...
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0answers
30 views

Simulation circuit program open source

I need to perform circuit simulations and from what I have been able to see the programs that are most used for this practice are Proteus and Multisim. But such programs are not open source. I have ...
0
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2answers
49 views

Asking for an opinion on By-passing an Op-amp circuit

Hope you are having a great day, I need to be able to bypass a non- inverting amplifier on my PCB in the future.I am using a header jumper to do this. My question is, should I : 1) short the non ...
1
vote
1answer
54 views

Can a AMS1117 fixed voltage regulator be used in a reverse biased way?

I was looking at a breadboard power module (link). This board has two inputs: a DC plug (7-12V advised) and a USB mini (5V). Using either of those two inputs, the board provides two voltages (3.3V and ...
0
votes
1answer
28 views

Triac-Circuit not Latching

I've built this triac test circuit here: https://320volt.com/en/triyak-tristor-test-devresi/ My transformer only delivers 10.5 V, however. I've tested some triacs which seems to work well. Both LEDs ...
0
votes
1answer
57 views

Two Wire Cable: Two Inputs to one output

[partially reposting from Music Stack Exchange (I was told to go here)] NOVICE QUESTION My question is simple: If I open up a guitar cable (which uses two inner wires: signal and ground) and connect ...
0
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2answers
78 views

How does the voltage doubler work at the startup?

I have no particular interest in power electronics but I am always impressed by such clever circuit solutions as the Greinacher voltage doubler. The idea behind it is so clear and intuitive that it ...
0
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0answers
24 views

RS-485 Master -> Slave Arduino *not sending or receiving*

I am using an arduino mega as a slave and arduino uno as a master in hopes to eventually make an ROV. But as of right now im having issues with getting the serial communication between the arduinos to ...
0
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0answers
32 views

Calculating the size of a capacitor in a sample and hold circuit

Question: In sampling system the sample rate is 500 Ms/s with an input signal of range of 1 V peak−peak and a clock jitter of 1 ps rms . A performance of 60 dB is required for all signals the Nyquist ...
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0answers
19 views

Simple Filter and RLC Circuit Pointer

If someone could push me in a decent / reasonable direction it would be much appreciated! I do a HNC part time on electrical / electronic engineering and with how busy I have been at work I feel I ...
0
votes
1answer
18 views

Stop DMA USART in STM32

In a noisy media, I need to receive 10bytes with DMA (about 1Mb). I have set the DMA and its interrupt as shown below: ...
3
votes
3answers
122 views

Difference between “|Z|” and “Resistance” in capacitor datasheet?

I'm shopping for capacitors, and I expect good capacitor datasheets to have a graph of |Z| (the magnitude of the capacitor's impedance) as a function of frequency. I was confused when I looked at ...
0
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0answers
33 views

What are the physical limitations of a SSD drive for long term cold storage?

As I understand it, SSD drives do not suffer mechanical failures, but are subject to a finite number of writes before failing. I have stored mechanical drives for 5+ years and have been able to ...
-1
votes
1answer
14 views

Why is the volatge fluctuating at the output pins of my dc-dc xl6009 voltage booster in a powerbank using tp4056 module?

i m making powerbank using tp4056 module and xl6009 dc-dc voltage booster . i have connected a usb type a female for output but my battery notification led is fluctuating because of voltage ...
0
votes
1answer
41 views

How to Output DDR data to 1 register

I have an Input which provides DDR data, I need to capture it and output it from the FPGA in one register (12bit). How can I do it? What I did for now is to capture the input data with always block ...
0
votes
3answers
78 views

Can the length of a wire impact SPI transmission?

I'm trying to wire a DotStar LED strip to another one. I have soldered on both ends of the added strip: VCC to VCC GND to GND CO to CI DO to DI I'm using SPI to control the LEDs. For some reason, ...
0
votes
0answers
38 views

Having a non constant current in a constant-current LED driver

I am using the TPS92511 LED driver as follows : It is not on a PCB but a veroboard with wires so it is not a perfect circuit. I have chosen Riadj to 4.9 kΩ which should give me something ...
0
votes
2answers
55 views

How does a transistor sweep generator work?

In particular I'm wondering about oscilloscope sweep generators, but the concept I don't understand remains the same for any type, which is, what does the triggering? I know a transistor can be ...
0
votes
0answers
14 views

Understanding IMON and PMON in LT2940

I have two 12 bit ADC-channels that I am suppose to use in order to read measurement pins in lt2940: Imon Pmon To make it easy, I have 16 Vin and want to scale the input so that I can calculate the ...
0
votes
1answer
78 views

Is it possible to connect multiple GND with one wire?

I am making the circuit using Stage and Controller, Power Supply and DAC Card. As for the system, the power supply provides a 15 V voltage to the controller/amplifier, and a 0 to 10 V control voltage ...
0
votes
0answers
27 views

Application doesn't work normally after initializing I2C in the bootloader

I am working on STM32F756ZG. I have a bootloader at 0x08000000 and application at 0x08040000. The bootloader and the application both use I2C protocol to store a few configurable parameters to the ...
0
votes
1answer
54 views

Attenuating op-amp circuit with offset

I am designing a non-inverting op-amp circuit that maps an input signal (V3) 0-3.3V to an output signal (Vo) 0.2-2.4V. I opted to offset the output up by 0.2V and then used a second op-amp circuit as ...
1
vote
2answers
96 views

Share ground between 12 V and 5 V

I am working on this small project getting a relay to turn on/off the amp. when it gets a 12 V trigger from a netstreamer. The relay is powered from 5 V USB 230 V adapter. Question: should I connect ...
-1
votes
2answers
51 views

AC L/N connection and DC ground question

I've recently bought new power supply because I wasn't able to repair the old one. And I don't want to do something stupid. I'm trying to do the wiring now and is there any way how to figure out what ...
-1
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0answers
49 views

PCB manufacturer with Railway Compliance [closed]

I want to know if there are some PCB manufacturers that can produce and certify the PCB according to the Railway European Normative.
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0answers
34 views

Gigabit ethernet [closed]

i have been looking for how gigabit ethernet sends and receives digital data at the same time, i got to know that it works based on echo cancellation method but how the receiver or transmitter get to ...

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