This circuit was obtained in a documentation from the 70s. The operational amplifiers used are uncommon today. Modern equivalent types can be tried out.
This circuit shows how to get 5 V under low current from an operating amplifier 741. I got this...
This circuit uses two JFET such as the BF244 or BF245 and has an excellent gain with small...
This circuit was found in the March 1995 issue of Electronics Now magazine. The circuit requires a...