This circuit was found in specialized microwave documentation from the 1960s. The circuit makes use of a varicap, and the transistor is a microwave type.
This sound effect circuit was found in a 1987 publication. It is a circuit that drives a set of...
The adjustment of the maximum load voltage is made in the trimpot. The circuit is from 1994...
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...