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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Light alarm activating SCR (CB25481E)
This circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit is based...
Parallel Port Interface (CB25730E)
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...
Electronic Thermometer (CB19604E)
The sensor of this circuit is a thermistor of the same value as the adjustment circuit formed by...