Sound triggered flash (CB8703E)

Found in 90s Popular Electronics, this circuit fires an old camera flash of the type with a xenon lamp from the sound captured by a microphone.

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Up to 60 seconds timer (CB21430E)
This circuit is from a 1966 Motorola Field Effect Transistors Manual. The circuit makes use of...
Tuned collector oscillator (CB21149E)
This circuit was found in an American documentation from the 90's. The transistor is a general...
High impedance preamplifier stage (CB4683E)
In the figure we have a high input impedance stage with a general purpose PNP transistor. An NPN transistor...