This circuit was found in the March 1979 issue of Radio Electronics magazine. Integrated circuits must be equipped with heatsinks. The maximum current is 1 A.
In the figure below we have two triggers made with the LM3900 transconductance operational...
The trigger signal for this circuit is an audio tone. Tones up to close to 100 kHz can be used. The...
Found in an American documentation from the 90's, this 1.5 A power supply provides 1.5 to 22 V of...