We found this circuit in a 1973 documentation. The null adjustment trimpot is 10k. The circuit can be powered by symmetrical sources from 9 V. The diodes on the bridge can be 1N4148.
This circuit uses a magnetic phone containing 3 germanium transistors. This is a Japanese...
This circuit was found in old English documentation. When the main power is interrupted, the...
In a voltage follower the voltage gain is unity. The input impedance is high and the output...