This circuit was taken from the 1976 Siemens Integrated Circuits Manual. The TCA106 is an operational amplifier similar to the 741.
The circuit shown has a voltage gain of 500 times and can use equivalent FETs like the BF245. The...
Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using...
We found this circuit in an old publication from Argentina. The relay must be of the sensitive type,...