Found in documentation from 1924, this receiver has several sets of coils. Power is supplied by several batteries and listening on high-impedance headphones.
August 2016 - It can be obtained from Mouser Electronics the new DC-DC PFM Step-Down XC9272 from...
This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be...
An interesting interface solution that can be provided in some cases is the one shown in the...