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.
This dynamic mixer allows for smooth adjustment of the signal's passage from one channel to...
Using this circuit a low current switch can be used in the control of heavy duty loads, powered...
We found this circuit in an old American documentation for hams. The circuit serves as a telegraph...