10 Hz to 10 kHz function generator (CB8455E)

Found in 90s Popular Electronics, this circuit generates rectangular and triangular signals. Operational amplifiers support equivalents.

| Clique na imagem para ampliar |

Decade Counter with Nixie Tube (CB20141E)
This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time....
Water Level Alarm (CB12215E)
I found this circuit in an Electronics Handbook from 1989. The circuit can be assembled with a...
Audio Booster (CB22489E)
This circuit makes use of a 2N301 germanium power transistor. We found it in a documentation from...