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After a little reading, it seems you're right. A simple op amp configured as a voltage follower should give me a very high input impedance. What do you mean about high current input being an issue? In this project I plan to have a loading/voltage drop test be possible through a switch shorting...
@Klaust
Thanks, I will look into those. I came across a much smaller relay that may give me enough room to use the original circuit but I will do some research on these high side switches.
@C1500
Thank you for the warning. Could you maybe point me in the right direction to adding input...
So I'm building an automotive electrical tester and I'm running into space constraints. The device is used to probe wires to see if they are at 12v or ground, apply 12v or ground to test components (power a headlight or fan directly), and to load test a circuit. The device is powered from the...
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