This CMNOS crystal-based circuit generates a 2 Hz signal. It was found in the October 1994 issue of Electronics Now. The output signal is square.
This circuit alternates the activation of two pumps depending on the position of the float. The...
We found this configuration in an early 1977 publication. The PNP transistor may be the BC558 and...
This circuit is better than the previous one in that the control is isolated by a transformer. The...