This circuit was found in a 90s Radio Electronics. It produces an ultrasonic signal in a special transducer at the frequency of 2.25 MHz. No information was given about the transformers.
With this circuit it is possible to control a current of several amps, depending on Q1, from a low...
Programmable unijunction transistors are not commonly used components today. This Popular...
This circuit has a waveform adjustment made with a potentiometer. C1 and R1 determine the base...