This small audio amplifier uses an uncommon integrated circuit today. The circuit is from a documentation from the 70s and is indicated for portable receivers of the time.
This two-transistor radio was found in a Japanese publication from the 1960s, with no information on the...
This simulation shows how a transistor can be used as a switch turning on and off in the LED. The...
We found this precision circuit in a manual from the 80's. The operational amplifier is of a...