The frequency of this circuit depends on C1 and, for the indicated values, it is 1 kHz. Equivalent operational amplifiers can be used, and the power supply must be symmetrical.
This configuration is from an old Motorola documentation from the 70s. The circuit uses operations that...
Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz...
This sophisticated timed sonic switch was found in a 2001 documentation. It has a timer with a...