Another of the many similar configurations we have in this section. This one is from a Radio Electronics magazine from June 1985. The transistor is according to the power of the controlled motor.
This circuit was found in a Radio Electronics from May 1965. FETs are from the time, but the...
This circuit can generate signals from 80 to 800 Hz with an amplitude of 0.3 V. We find it in a...
Because it uses TTL integrated circuits, this siren must be powered by 5 V or as indicated with D1 to...