This timer has a divider programmed by BCD switches. The circuit is from a Radio Electronics magazine from February 1989.
This circuit, which may have more inputs, consists of an optical OR gate using common...
Fluorescent lamps in the range from 4 to 40 W can be powered on from cells or batteries. The lamp...
This old taster circuit, found in 1970s American documentation, is for operatives and comparators of...