Using junction FETs, a configurable configuration is achieved for very low frequencies. FETs can be of almost any type and the frequency depends on the capacitors.
We found this circuit in the April 1975 Radio Electronics magazine. The circuit has a latch and...
We found this sophisticated home alarm in a 1994 documentation. The circuit supports sensors of...
This circuit was found in the 1991 Electronics Experimenter's Handbook. It activates a relay when...