Project Science Of Electric Guitars:
Having made a "guitar" (wire under tension), "pickup" (coil and a magnet) and a "speaker" (kitchen foil in a magnet), and proving it all works with a commercial amp, there was only one element left: building our own amp
So for the last 3 weeks the student has been learning to solder and has put together the simplest amplifier circuit I could find: 2 inputs, 2 outputs, one each of resistor, capacitor, transistor. With guidance, but doing it all themselves.
@_thegeoff Is the capacitor in series with the input or somewhere else?
Unless the transistor is a FET, I don't see how that can work with a single resistor (I expect a resistor in series with transistor's base is needed, as well as a resistor that will allow the capacitor to both discharge and charge).
@robryk Yup, cap in series on the +ve input, then to the base. Variant on the first circuit here: https://theorycircuit.com/audio/simple-single-transistor-audio-amplifier-circuit/
Just a proof of concept rather than anything particularly practical: remember, this is the world's worst electric guitar, the speaker is kitchen foil and croc clips :)
@robryk Pretty sure I said "variant" anyway ;)
And it depends on whether you use electron flow or conventional current. My point being OUR circuit works ;