We found this circuit with the CMOS4046 in the August 1994 Electronics Now magazine. The circuit is activated by pressing switch S1.
This low drift or offset circuit is from an 80's documentation. The configuration can be made with...
This circuit has a logarithmic response as a function of the light falling on the sensor. The...
Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power...