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.
This circuit of old documentation can be implemented with modern operational amplifiers. The...
This TTL circuit can be used as a shield, controlled by one of the inverters. The circuit must be...
The integrated circuit used in this 80's mixer is the LM301A. However the circuit can be used to...