This siren configuration found in a documentation from the 1980s can also be seen in many of our projects and in this circuit bank. Transistors are common, but Q2 can be of power for a higher voltage supply.
This circuit is from a 1968 documentation. It generates a non-symmetrical signal with the waveform...
This monochrome analog TV pattern generator was found in the July 1991 issue of Radio Electronics...
This is the conventional application of the UCN4202 to control a 12 V stepper motor with current...