This circuit is from American documentation from 1970. It can be designed with a BC558 and for the operational, we can use equivalents. The FET can be the BF245.
This circuit is from Motorola's 1990 Linear Databook. The integrated circuit used is no longer...
This circuit uses a TL071 to differential amplify the signals from a microphone and thus reduce...
In the figure we show how a 2-pole x 2-position switch or HH should be connected to reverse the...