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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Protected 1 A Power Supply (CB834E)
This power supply is protected from shorts in the load. The BD135 must be mounted on a heatsink...
Line Amplifier (CB19052E)
This amplifier for audio transmission lines was found in a 1961 American publication. The critical...
CMOS Oscillator with 4001 or4011 (CB13143E)
The maximum frequency of the oscillator shown in figure 10 is on the order of 5 MHz, depending on the...