This repellent operates with frequencies from 30 to 45 kHz, serving for insects and rodents. The circuit is from 80s documentation. The transducer is a piezoelectric type.
We found this complementary simetry configuration in a1980s documentation. Transistors, which are...
This circuit was obtained from the May 1971 issue of Radio Electronics magazine and is intended for...
This circuit acts as a VU-meter when connected at the output of any audio amplifier, triggering a...