four buttons on one ADC pin
Motivation Sometimes you just barely get away with the number of available microcontroller GPIO pins to implement the desired functionality — And then you discover that you have no more […]
Category Archives: hacks
Wheelchair Accessible FX Stompbox – A Remote Control
Motivation A friend of mine is a talented bass guitarist who happened to play in my band. He came across the TECH21 Sansamp, which is a nice and compact bass […]
Brute Force Computation for Cheap Log Digital Potentiometers
Abstract This article covers the attempt to build a digital logarithmic potentiometer out of two linear potentiometers. The benefits of this concept are: Linear digital potentiometers can be easily procured […]
(semi) automated drill press table for PCB manufacture
Motivation As you may have seen in earlier articles, I produce my own PCBs at home with the toner transfer method. After some experimentation the PCB quality is quite satisfactory, […]
MIDI OUT for vintage Korg CX-3
Motivation The Korg CX-3 is one of the most popular and best sounding Hammond C3 clones. (I am talking about the vintage version from the 70s, not the digital reissue) […]
Velocity Adjustment for MIDI Masterkeyboard
A while ago (I think I was 16 or so) I bought a MIDI master keyboard, i.e. the FATAR Studiologic TMK-88 (or TMK 88?). The production quality of the keys […]
12AT7 Overdrive INSIDE the Korg CX-3
In the fall of good old 2011 I decided that it would be a nice thing to have a tube overdrive not on top of my organ but inside the […]
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