This circuit is from a 1975 Miniwatts magazine, therefore using Philips components from that time, now difficult to find. The circuit directly controls a heating element via a Triac.
Two inverters of a 4069B type CMOS integrated circuit form this oscillator which is characterized by having...
Capacitor C and resistor R in this circuit determine the time the output remains at the high level...
This water or moisture sensor circuit was found in the February 1984 Radio Electronics magazine. The...