This flashing allegory with 555 integrated circuits was found in the Radio Electronics Experimenter magazine from 1989. It is a simple circuit to assemble.
We found this circuit in a 1997 documentation. It can be used in any common 12 V source and has...
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
With this circuit from an old 1973 publication it is possible to use a small speaker as a...