Balanced Modulator MC1594 (CB14588E)

This circuit is from the Motorola Linear Databook from 1990. The integrated circuit used is uncommon today.

Relay isolator (CB8033E)
This shield circuit is from an American documentation from 1969. The components can be modified...
Bridge Operational Amplifier (CB15804E)
This is an instrument amplifier that uses two resistive sensors. The circuit is suggested by...
60W Mid Treble and Bass Amplifier (CB15248E)
This amplifier provides 20 W of power on each channel, containing separate filters to power a...