This circuit was found in a Popular Electronics from the 90's. Its purpose is to detect the ionization of the air. The meter can be replaced by the current scale of an ordinary multimeter.
This circuit uses comparators equivalent to LM339 to generate signals of two waveforms whose...
A Reset-Set flop-flop capable of directly controlling a relay or other power load can be...
The circuit shown here can be used to produce low-frequency sine wave signals from CMOS logic. The...