This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.
In the figure we have a simple shield of 1 transistor. The supply voltage depends on the relay. The...
This simple 80's CMOS game was found in an English magazine of the time. It appears elsewhere on this...
This circuit, suggested by an old American publication, allows you to use the AM radio antenna of a...