Flasher CA3130 (CB22004E)

Found in an English documentation from 1977, this flasher or pulser circuit drives an LED. The frequency depends on C2.

Neon Power Monitor (CB24103E)
This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
1-Transistor AM Radio (CB18380E)
This elementary receiver with only one germanium transistor was found in a Japanese publication from the...
Regenerative receiver (CB22273E)
This simple 1 transistor circuit was found in an American documentation from the 60's. The...