This circuit provides a few watts of output and can be used in the car as an auxiliary amplifier. Transistors must be mounted on heatsinks and the speaker can be 4 ohms or 8 ohms.
The circuit with a common operational amplifier uses a zener as a reference. The circuit is from...
This optical counter was found in a 1964 Electronics Design. It makes use of an uncommon...
This 6-transistor Japanese commercial radio was manufactured in the 1960s. The receiver is a super...