This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an English documentation from 1967. The transistors are from the time.
Figure bellow shows how a digital frequency divider or counter can be created using the flip-flops containing...
This circuit was found in an ancient American documentation. With it is possible to double the...
This circuit was found in a Popular Electronics from the 90s. The circuit uses general purpose...