This flasher for incandescent lamps was found in Radio Electronics magazine from July 1968. The frequency and duration of the pulses are adjusted in R1 and R3 depending also on C1.
This configuration, found in many publications, is from an American book from 1981. The power...
The circuit shown is from an American publication from 1970. It produces a tone that attracts fish...
Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at...