In the figure we have a simple way to produce tone in a piezoelectric transducer. The frequency depends on the capacitors and the supply can be done with voltages from 1.5 to 6 V.
We found this circuit in the semiconductor ON manual using couplers of the time. These components...
VU or Volume Units is a sound intensity indicator that can be installed on any stereo. The...
This circuit was originally designed for medical applications and biological experiments. The...