Relaxation oscillators (for capacititive touch sensing)

[HankMcSpank]

If your Guitar is so sacrosanct, then why even consider sticking stuff to it? Leave it the way the manufacturer intended it to sound and why not simply build a bigger custom wah-wah pedal box with a heap more buttons and functions for controlling your effects?

Because the end goal here is, is a guitar sustainer, ie infinite sustain (the holy grail for most guitarists) ...there isn't an effect pedal in existence that yields an equal effect (yes, there are guitar sustain pedals, but they're nothing more than glorified compressors/limiters...as the guitar note dies, the compressor pedal merely cranks up the gain to try and counteract, leaving you with a woeful signal to noise ratio & a still dying guitar note)....a proper guitar sustainer, uses an electromagnetic driver to keep the string moving - and that needs to go physically go on the guitar (as it goes this driver will literally be stuck onto the guitar - to save the unpaletteable thought of having to drill the guitar to mount it)

For those that hold an interest, I made a short video clip where you can hear the end result (it's at a very rough & ready stage here though!) - complete with a breadboarded circuit hosting a 16F690 to one side of the frame (which presently has 5p momentary switches too - those are the puppies I'd like to replace with capacitive sensing switches - I can then use the screws on the scratchplate as on/off switches!)...

(btw, that ain't no vintage guitar, but my test guitar...no worries if it gets scratched while I mess about mounting/removing driver coils to establish the best one)

Ah... I see what I wrote with regard to DIGITAL OUTPUT... what I meant was that the COMPARATOR gives you the Digital Output. You NEED to select C1OE and C1ON (C2OE & C2ON) bits to 1 so the Comparator gives you a physical Hardware Output (rather than just setting a bit in a Register internally within the PIC), and you set the TRIS for that pin to 0 (treat it as DIGITAL OUTPUT - which is what it is).

I need to sit down in a quiet darkened room & digest that paragraph....but I will!

rmteo ...thank you for your input, your chosen path - whilst brilliant - is excessive for my meagre switching needs! (I only need three switches & have an unhealthy obsession with keeping the component count low!)