This circuit with germanium transistors is from 1960 and was found in Mullard's transistor application manual from 1960. The circuit can be adapted to use more modern transistors.
This shield circuit is from an American documentation from 1969. The components can be modified...
This is an instrument amplifier that uses two resistive sensors. The circuit is suggested by...
This amplifier provides 20 W of power on each channel, containing separate filters to power a...