This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V batteries since it requires a symmetrical source.
A version of a monostable that uses the 4528, but is triggered by negative transitions of the...
This circuit, which operates between 7 and 30 MHz, was found in Radio Electronics from the 1980s....
With a touch of a sensor, it is possible to turn on or off incandescent lamps. The circuit must...