Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

Micro AM Radio (E/P) (MIN020E)
This micro AM radio will tune strong stations in the frequency range between 530 and 1,600 kHz....
Two-Tone Buzzer (CB24121E)
This unijunction buzzer configuration appears in this section from many publications and sources. The...
Push Pull stage OC19 (CB18855E)
This counterphase output step was obtained in a Japanese magazine of 1957, a time when the...