High-speed buffer (CB9556E)

Found in a 1980s documentation, this circuit makes use of components from that time. Modern equivalents can be tried out.

2-Transistor Amplifier (CB22508S)
This 1950's circuit used one of the first commercial transistors and had two stages for audio...
Audio compressor (CB22154E)
Using integrated circuits from the time, we found this audio compressor in an English publication from...
Micro Radio (CB18167E)
This is an experimental crystal radio that uses no power source. The antenna must be very long (at...