This circuit has an accuracy of 1%. The components used must be precision as well. The input frequency range is 40 Hz to 10 kHz with the indicated components.
The integrated circuit used in this project is unusual and it includes internal transistors that...
This 1997 documentation circuit was originally created for use with Camcorder type video cameras....
This circuit is from a 1972 Motorola publication. The used transistor can still be found, but it...