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.

| Clique na imagem para ampliar |

Half-wave power control (CB20715E)
The trigger element of this circuit is a neon lamp. The SCR admits an equivalent. We found it in...
Bistable (CB21100E)
This bistable with transconductance operational amplifier was found in early National...
Portable ultraviolet source (CB7188E)
This 1965 circuit consists of a small inverter for an ultraviolet lamp. The circuit is from a...