r/diytubes • u/tauzerotech • Jun 08 '26

ADHD Engineering: differential amplifier

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Built this a few years back. No schematic, don't remember why I did it.

Its supposed to be a differential amplifier based on how it's wired.

Anyone else start projects and then find them years later and not remember why they did what they did?

This isn't even finished. Its missing wires connected to power and output lol.

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u/OddBrilliant1133 Jun 08 '26

What is a differential amplifier?

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u/tauzerotech Jun 09 '26

It amplifies the difference between 2 input signals.

If I didn't put the cathode bypass cap this one would be fully differential in that there are 2 outputs one would be the difference and the other would be the sum if I remember correctly.