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.
May 2017 - Mouser Electronics announces the availability of new Toshiba SSM6K N Channel MOSFETs...
Using integrated circuits from the time, we found this audio compressor in an English publication from...
The 2009 project is based on the integrated circuit9 LM317T, an adjustable regulator with 3...