Solar radio (CB20485E)

This circuit is from a 1991 publication. The integrated circuit used is an integrated radio from that era.

Electroscope (CB4341E)
This simple electroscope with bipolar transistors is not the most sensitive, but can detect static...
Telegraphy Practice Oscillator (CB4200E)
This is one of many Morse code audio oscillators that can be found in this section. The circuit...
AND Gate Using NOR (CB198E)
Three of the four gates found in a 4001 can be used to perform as an AND gate. This improvisation...