This high sensitivity receiver of 30 nW was found in documentation from the 1980s. Integrated circuits are from that time.
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...