This amplifier with old germanium transistors is from a 1957 documentation. The power is a few hundred milliwatts and the transformers are common types of driver and output of the time.
We found this light relay circuit in year 2000 documentation. The relay is 6 V and the circuit...
We found this circuit in the Linear Technology Applications of 1997. The circuit uses components from...
We have dozens of similar projects in articles and circuits on this site. This is from Radio...