This circuit for AC loads was found in February 1976, Radio Electronics magazine. The triac is common, and the times are given by the 20 MΩ resistor and the 1 uF capacitor.
We found this configuration of band rejector filter or band rejector with operational 741 in a...
The circuit shown charges Nicad batteries from the bicycle dynamo and provides constant energy for a...
This circuit requires an input current of only 20 fA (femto amps) which corresponds to a...