We found this time base circuit in a timer project from the August 1972 Radio Electronics magazine. The circuit takes advantage of the 60 Hz signal from the power grid.
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....