This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz to 100 kHz and modern equivalent components can be used. The circuit is from Ferranti.
A 25 mVpp applied to the input of this circuit produces in the output a 1 Vpp signal. The...
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...
This is the power step of the previous circuit. Output transistors must be mounted on good heat...