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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Analog Multimeter (CB11829E)
This circuit from the 40's is a conventional analog multimeter with several scales. Its accuracy will...
1 W LM390 Amplifier (CB13196E)
The integrated circuit used in this project is no longer very common, but if found it can result in...
5 V switched regulator (CB8702E)
This switched regulator configuration was found in Motorola's 1969 documentation. The integrated...