This contact or reed switch actuation was found in a 1964 Electronic Design. The circuit can be used with sensors and the triac is load dependent.
The circuit presented with low drift is from the Motrorola LinearDatabook of 1990. The circuit...
This low pass filter has attenuation of 5.5 dB and the frequencies depend on the values of the...
We found this circuit in a 2004 documentation. The trimmer is common for 30 pF or 40 pF and the...