This circuit was obtained from a 1967 General Electric manual. The circuit uses components of the time, but equivalents can be used, for example, a BC547 for the transistor and a TIC106 for the SCR.
This circuit can be powered by voltages from 3 to 9 V providing output power from 100 mW to 1 W....
This circuit for dual-gate MOSFET was found in a 90’s Popular Electronics. The coils are according...
In the figure we have the simple way to obtain an integrator with a type 741 operational...