The circuit below was suggested by the Motorola Linear Databook of 1990. The component used is uncommon and the power can be between 7.5 and 12 V.
We found this circuit in the July 1969 Radio Electronics magazine. The circuit uses a coupler made...
The FET of this circuit of a 1971 publication may be the BF245. The circuit serves as a voltage...
This circuit was obtained from an American documentation from 1969. The operational amplifier and...