This circuit was found in American documentation from the 1980s. The integrated circuit used is a voltage comparator of the time. Modern equivalents can be tested.
The JFETs of this old circuit admit modern equivalents and their characteristics determine the maximum...
This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general...
This circuit transmits in the FM band. It is a good range FM transmitter found in a 90's Silicon...