This circuit was obtained in a 1978 publication. The supply can be symmetrical from other voltages. Frequency can be changed by changing the capacitors.
This circuit was found in documentation from the 80s. It is based on unijunction transistors not...
This circuit was found in the May 1982 issue of Radio Electronics magazine. The circuit inverts the...
This alarm is designed for doors and windows, but nothing prevents it from being used in cars,...