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Electronics Forum (Circuits, Projects and Microcontrollers)

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Website title: Electronics Forum (Circuits, Projects and Microcontrollers)

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Message History

What is this component and what is its function?

I have this DC power supply (analog, with toroidal transformer) where the earthing wire is connected to the supply negative output in series with a 100k resistor in parallel over a component (red in the picture). What is that, and what could be its function?


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Switch Circut

I want to control a sound board on a model locomotive, by getting the sound to be in sync with loco movement. I have a small amount of knowledge with electronics. My thought is to use a small relay with 12vdc input from the motor control that would switch the input on the sound board. Problem is the loco has forward and reverse thus the polarity to the relay changes and blow th...


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Op amp phase

I just built an op amp inverting amp and am getting my input waveform and output waveform out of phase.....any ideas


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renewed interest in old project I call it WICKED 8

while doing some bench cleaning I ran across this old PCB and decided if I can improve y design. considering PWM on the contrast pin of the LCD? Tumbleweed wrote the SF code but having issues. needs further investigation I added the P mosfet for polarity protection


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Unable To Get Advertised Op-Amp Slew Rate

Hello. When I build audio circuits that need to drive low impedance loads (e.g. headphones), I typically use a Sziklai-pair class AB output stage biased with diodes. I usually use an op-amp to drive the stage and place the base-to-emitter junctions of the transistors in the op-amp's dc-coupled feedback path so that it can compensate if the bias voltage changes with temperature o...


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