This is a commonly used and very simple circuit for a passive tone control as used in the Big Muff Pi guitar pedal.  I’ve tested it with a 10k logarithmic potentiometer and it would definitely work more effectively with the 100k linear potentiometer as indicated.

Here is a portion of the low power LM386 based guitar amp I am prototyping.  This is an audio buffer used for the input stage of the amplifier. Most people would use a simpler circuit built around a FET however I did not have any FET transistors within immediate reach so I did a whole bunch of fiddling around on my breadboard trying various other components I did have. This is what I found worked with the NPN audio transistors I was able...

Here is a simple project I recently completed.  I needed a footswitch controller for my Peavey Studio Pro 110 amplifier.  It’s a very nice amplifier for small apartment use and I bought it used for a very decent price – the price was low partly because it was missing the footswitch controller. The actual controller is quite simple inside, being composed of two switches and two LEDs connected to a 1/4″ stereo audio cable...

I have migrated my previous reprap.briancantin.com posts over to my new novakane.ca domain (you’re already there). This new blog will have all sorts of hacks, articles and general technology projects that I work on, most being open source. Coming up soon will be posts of some of my 3D object designs and some guitar related electronics projects.