Found in a Popular Electronics from the 80's, this circuit simulates the equivalent card game. The circuit is CMOS and can be supplied with voltages from 6 to 12 V.
This simple field strength meter was found in a 1967 documentation. The transistor is germanium, and the...
This is yet another version of the light-controlled oscillator that can be found on this website. This...
Found in a 1969 documentation, this circuit for the 20 MHz band does not use a transformer. The circuit is...