Digital recorder ISD1016 (CB7963E)

Found in a Popular Electronics from the 90s, this digital recording circuit uses an unusual integrated circuit today.

Few Component FM Transmitter (CB10004E)
This transmitter uses an electret microphone and has a few tens of meters in range. The coil L1 is...
LM383 8W amplifier (CB10902E)
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
Bistable Indicator (CB6678E)
Found in an American publication of 1968, this circuit makes use of a pilot light of the time. It...