This circuit from the 1980s uses an operational amplifier that is uncommon today. The circuit can be designed with modern operators. The gain is 40 dB.
This circuit is from an American cookbook from 1977. The circuit generates a voltage of...
In the figure we have the simple way to implement the NO-OR or NOR function with common diodes and a...
We found this configuration in an integrated circuits manual. The transistor, which can be of any...