This circuit was found in old documentation, but the setting applies to any operational. Resistors and capacitors determine the frequency. For the indicated values the frequency is 10 kHz.
Found in a Popular Electronics from the 90's, this circuit is used to indicate the operation of...
The integrated circuit used in this 1987 project is not very common these days. However, if found...
This car alarm was found in an American '80s documentation. The circuit automatically activates...