This counter was found in the November 19983 issue of Radio Electronics magazine. The power supply can be between 3 and 12 V typically. The counting speed depends on C1.
This circuit uses a 555 (according to the diagram) to generate 50 ms tone bursts at a frequency of 1.5...
The input frequency of a signal applied to this circuit will be divided by one to 9999 in this...
This circuit is the conventional use of the 7805 as a constant current source up to 1 A. The...