This light effect circuit was found in the July 1971 Radio Electronics magazine. The circuit is powered by 110 V mains but can be modified depending on the triac and lamp.
This circuit is from a Japanese magazine from 1967. The circuit uses transistors from that time,...
This circuit produces 1 kHz square signals using the CMOS IC 4070. The frequency is given by the...
Found in an old Radio Electronics, this circuit applies to frequency meters for frequencies up to 100 MHz....