This circuit, which can be built with several CMOS gates, was found in the March 1996 issue of Electronics Now magazine. The circuit has the base frequency determined by R1 and C1.
This didactic circuit was found in a 2001 documentation. It presents the result of programming in binary...
This VFO circuit generates signals from 2 Hz to 50 Hz. We found it in Popular Electronics from...
This circuit can be used as a buzzer from 3 different locations, allowing you to identify where it went...