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.
Found in Analog Devices documentation, this circuit uses components from the time. Formulas for...
This circuit is from a 1977 technical documentation. Diodes D1 and D2 can be 1N34 or any other of...
This circuit, found in a publication from the 1970s, uses two PNP power transistors that can be...