This sophisticated circuit was found in the November 1978 issue of Radio Electronics magazine. Based on CMOS logic, it has several types of timing, controlling the wiper relay.
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...