i've seen people use speakers for this- i just don't get how a speaker (output) becomes a pickup (input)? I'm really just starting on this whole diy audio stuff, but is there any specific way you wired the speaker up? Any input would be appreciated
I saw a CBG someone made and used a small speaker as a pickup. They mounted it under the lid like a piezo, seemed to work fine but it was playing through a tape recorder turned into an amp so it sounded tinny, hard to tell anything.
It does work. get a 1/8 to 1/4 headphone adapter and plug your headphones (not earbuds) into your guitar amp and walah! they work like a mic.
like a piezo buzzer used as a pickup, if you feed a signal into it, it vibrates, if you vibrate the piezo, it generates a signal.
physics: the diaphram has a coil mounted to it, in front of a fixed magnet. run a signal through the coil and it attracts/repels to/from the magnet moving the diaphragm and you have a speaker. move the coil in front of the magnet and you have a tiny generator making a weak signal that most amps can grab and use.