Wednesday, January 14, 2026

3 stage amp with filter and feedback

This little 3 stage amp works really well in sim. R4 and R5 form a voltage divider for the degenerative feedback. They could be replaced with a pot or rheostat for volume control. C2 could feed  a low Z speaker or headset. The input PI network is a low pass filter which should keep RF out of the amp. 

* I built this one and it passes the finger buzz test.  

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