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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Active Switch (CB19851E)
This is a two-input audio switching circuit. The operational can be of any type and more entries can...
12 W Stereo Amplifier TDA1010 (CB14721E)
We found this amplifier for automotive use in the Philips integrated circuit manual from 1990. The...
FM Booster (CB22014E)
Found in old English documentation this circuit can be made with a BF245 or equivalent. Coils are...