We found this circuit in an Electronics Now magazine from June 1995. The transformer has a primary according to the network and a secondary of 6 to 9 V with 100 mA.
This powerful sound emitter used in defense to intimidate people was found in a 90s Popular...
This circuit was found in a 1965 Electronic Design. Transistor Q2 must be load dependent. The circuit...
In the figure we have the amplifier application in a NOR gate, with reference voltage equal to the...