Based on CMOS logic gates, this circuit was found in an Electronic Design from the 90s. The circuit is for voltages from 11 to 15V, but it can be changed,
The transducer of this circuit is a small ceramic capsule or crystal earpiece and the frequency given...
This circuit was found in an American documentation from 1968. The circuit generates ladder-shaped...
The circuit shown in the figure generates a rectangular signal whose frequency depends on C1. For...