This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from the era. Observe the input and output voltage.
This circuit interferes with the operation of infrared remote controls. Your radiation should be...
We found this circuit in an American 1980s documentation. The circuit uses a piezoelectric transducer...
This circuit for the car can be found in other versions in this section. This is from an 80's...