Рет қаралды 51
Early in the lockdown, I built a 6 valve broadcast band (Medium Wave) superhet radio that also features a 'Magic Eye". Here we see the magic eye operating as I check the suspiciously accurate dial calibration using harmonics from my signal generator, 300kHz fundamental, 600kHz 2nd, 900kHz 3rd, 1200kHz 4th and 1500kHz 5th.