Found in the December 1986 issue of Radio Electronics magazine, this circuit is designed to select 4 outputs with pulses from a pressure switch. The circuit includes LED indication.
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...
The integrated circuit of this amplifier is not very common today. The output transistors can be...
Found in an old documentation about neon lamps, this circuit has the frequency basically...