This circuit, for frequencies up to 100 kHz, was found in American documentation from 1970. The circuit can serve as a reference for projects with modern equivalent components.
This 6 transistor TR26 commercial radio was sold in Japan in the 60s. It is a super heterodyne circuit...
The figure shows how to measure current with a 3 ½ digit 7107 meter described in Electronics Now...
This amplifier circuit is from a 1952 documentation. The frequency of the amplifier signal depends on...