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 sensitive sound or noise activated key can be used in an alarm system. The circuit is from an...
August 2016 - Mouser Electronics is offering the development kit board Joule ™ 570x with expansion from...
With this relaxation oscillator with a neon lamp we can generate small intensity audio signals for...