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.
This interesting circuit for SMD assembly appeared in the November 1987 issue of Radio Electronics...
This circuit was found in the June 1986 issue of Radio Electronics magazine. It is based on two...
Found in a 1980s documentation, this circuit works with a 12V relay. The horn is the boat's own. |...