This circuit was found in a Radio Electronics from 1970. The coupler with LDR is from that time, but the circuit can be adapted to use modern components and act as a shield.
Fully-Certified Software Development Kit Leverages Hardware-Based Calculations to Create Fast,...
This receiver receives signals in the range of 3.2 to 16 MHz, presenting a good sensitivity thanks...
This circuit makes use of an unusual Analog Devices component today. The circuit is from a 90's...