Speaker protection (CB8193E)

Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in case of amplifier failures.

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Sequential unijunction timer (CB10190E)
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...
Rain Alarm (CB12276E)
We found this alarm in an English publication from 1978. Although the original power supply is 3...
Binary Demonstrator (CB24244E)
This TTL circuit was found in the February 1973 issue of Radio Electronics magazine. The power...