Solar radio (CB20485E)

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

Infrared Audio Link (CB11967E)
This simulated circuit on the NI Multisim transmits modulated infrared signals with the audio...
Commercial Radio with Loop Antenna 75 W1 (CB18438E)
This commercial receiver manufactured by Sanyo in the 1960s used a loop antenna. The circuit is...
VLF Converter (CB25217E)
With this circuit from the September 1989 issue of Radio Electronics magazine, it is possible to...