Simple Smoggy Circuit Schematic
Even if your good old (Sony) Walkman sees little use nowadays it would be a shame to get rid of it altogether. The more so when just removing the tape head would allow the built-in audio amplifier to become an outstanding electrosmog detector for a variety of purposes. Looking at the schematic, readers with RF experience will have no difficulty in recognising the diodes and coils of the two detector-receivers, which serve to capture and demodulate RF signals. With its coil of four turns (L2) one receiver covers the higher frequency range of the electromagnetic waves, whilst the sec-ond detector takes care of the lower frequency range. Circuit diagram : Simple Smoggy Circuit Diagram For this reason a coil with a greater number of turns is required: L1 is an RF choke of about 250 µH. The precise value is not critical and it could equally be 220 µH or 330 µH. The outputs of both detector-receivers are connected to the cables disconnected previously from the tape heads...