Slave flash (CB8700E)

This circuit was found in a Popular Electronics from the 90s. It uses a LASCR which is a photo-SCR not common today.

Neon tone generator (CB8048E)
Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is...
Voltage to Frequency Converter (CB21496E)
Found in a 1967 Electronic Design, this circuit operates in a range of 0 to 1 V input with...
Two Transistors FM Transmitter (CB19058E)
This small transmitter circuit has a range of about 100 meters, and the antenna must be connected to...