This superb offer sees the two-time What Hi-Fi? Award-winning Marantz PM7000N with £200 off at Amazon. We originally tested the amp at £999, but the price has hovered around the £799 mark in recent ...

The basic circuit is a Schottky diode detector between an antenna and a high-gain audio amplifier driving high-impedance headphones; [Ido] built a variation that also has an LM386 amplifier stage ...

The basic circuit is a Schottky diode detector between an antenna and a high-gain audio amplifier driving high-impedance headphones; [Ido] built a variation that also has an LM386 amplifier stage ...