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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In use telephone indicator (CB9297E)
Found in a Popular Electronics from the 90's, this circuit is used to indicate the operation of...
15 W Amplifier using theTDA7204 (CB3832E)
The integrated circuit used in this 1987 project is not very common these days. However, if found...
Vehicle Alarm (CB4867E)
This car alarm was found in an American '80s documentation. The circuit automatically activates...