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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Operational and Transistors Symmetric Power Supply (CB14885E)
With this circuit it is possible to have a symmetrical source from a simple source with voltages from...
Constant light (CB12750E)
The basic idea of the circuit shown in the figure is to increase the brightness of an ordinary...
9 V Transistor Regulator (CB20289E)
This regulator can use BD'136 as the main transistor and as a reference next to a BC548 zener. The...