Boat alarm (CB8966E)

Found in a 1980s documentation, this circuit works with a 12V relay. The horn is the boat's own.

| Clique na imagem para ampliar |

Dark activated alarm with hysteresis (CB7868E)
Found in American documentation from the 90s, this circuit can be implemented with modern...
Latched Switch (CB25321E)
This bistable circuit that drives a relay with a pushbutton was found in the March 1pp6 issue of...
Logic Control 555 (CB13832E)
The purpose of this modified astable is to make the initial pulses have the same duration as the...