This circuit can be used to generate percussion sounds such as bell, triangle, etc. The circuit must be powered by symmetrical source and the triggering is by external pulse.
This circuit came out in a Popular Electronics from December 1995. It is a Wien bridge...
This circuit was indicated in an old American publication to serve as a Laser alarm system as a...
Found in an American documentation from the 90s, this circuit uses small low voltage lamps (6 to...