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 filter, from an audio publication from 1977, passes the frequency range corresponding to the...
In the figure we have three voltage doubler configurations that can be used in high and low...
This circuit was found in Motorola documentation from 1966. The lamps are according to power and...