Electrical Engineering Questions, Problems & Solutions : TransWikia.com ~ Page 22

How to make a proportional current output on a constant current driver with PWM dimming

I'm making a constant current LED driver out of 2 2N2222 transistors and a couple of resistors. Works great. I added a PWM signal to the input so I could...

Asked on 11/26/2021 by 0x3333

1 answer

What is this component and what is it used for?

Today I opened an old adapter to salvage the transformer and found this component which I also desoldered. What is this component and what is it used for? ...

Asked on 11/26/2021 by beannshie

3 answer

How to control output resistance with voltage

I want to use an LM555 and change the R1 resistance with voltage gradually (staircase waveform). What circuit can i use to change the resistance by changing the voltage?...

Asked on 11/26/2021 by Mpessy

5 answer

Current sense resistor for high voltage

I have a 5KV DC output from a Cockcroft-Walton multiplier. The current is around few microamps as per the simulation. To prevent discharge, the 200Mohm resistor holds the voltage...

Asked on 11/26/2021

3 answer

SystemVerilog - Enforcing prevention of inline initialization of logic/reg elements used as flip-flops

Given a SystemVerilog design modeling an ASIC, how can I enforce the rule that all logic/reg elements that are used in flip-flops should not be initialized to a certain...

Asked on 11/26/2021 by norandomtechie

1 answer

Series and parallel LED using

I am planning to build 4 LED-strips using two different 'white' settings (1+1 strip x 4). The LEDs will be driven by a 24V constant voltage dimmable RGB-DALI driver (up...

Asked on 11/26/2021

1 answer

Parameters of two port networks

Is parameters(Z parameter, Y parameter etc.) of two port networks are constants? I try to figure out this and found that if network contain some active elements or...

Asked on 11/26/2021

1 answer

Purpose of capacitors connected to both inputs of Op-Amp

What is the purpose of the capacitors in the following circuit? Using Ohm's law :V+ = I * RTDV- = I * R3and also :Vout = G * (V+ -...

Asked on 11/25/2021 by Ermolai

3 answer

74HC14 VCC and GND won't connect even with PWR_FLAGs attached to board input connector

Sorry, new to KiCAD so decided to place a single 74HC14 in schematic and single 4-pin connector with VCC, GND, sig input and sig output. Also threw in 5 resistors...

Asked on 11/25/2021 by John1024

1 answer

Custom waveform in hardware

I need to create a custom square wave at the hardware level. It's a 3.3 V signal at 100 kHz but the high portion of the form needs to be...

Asked on 11/25/2021

2 answer

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