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.
Line voltage compensation (CB8816E) This circuit for the alternating current line (AC line) was...
September 2017 - IXYS Class X2 to 700 MOSFETs can now be purchased from Mouser Electronics....
Depending on the value of C1, this oscillator can produce signals of up to 1 MHz. For a capacitor of 10...