Listening to EM fields

Listening to electromagnetic fields is easy and fun (you can actually listen if a wire is ‘live’ or not, provided AC current is running through). Especially laptop computers emit a lot of EM noise in audible range. Use the electronics of an old walkman. Perhaps you have the guts of a walkman lying around, perhapsRead more

Listening to candlelight

I remembered reading once that manufacturers of electric candles had been using melody-card chips as LED drivers, causing these candles unseeingly to emit music. In order to ‘audify’ this optical sounds, I connected a BPW34 diode (with large Silicon cell, so it actually generates a voltage) to a jack chassis and hooked it up toRead more