Water-Activated Triac Switch (CB24054E)

This circuit is from a July 1970 Radio Electronics magazine. The sensors are metal probes. The 18 V power source must be isolated from the mains.

| Clique na imagem para ampliar |

Xenon strobe light (CB9108E)
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
Astable with voltage limitation (CB21826E)
Found in a 1974 Ferranti manual, this circuit uses diodes to limit the voltage on the transistors. The...
Voltmeter with the CA3140 (CB12306E)
This circuit is from an English publication of 1991. With it you can use a common multimeter on...