4-step 4017 Sequencer

This weeks project is a simple 4-step sequencer based around a 4017 decade counter chip. The basic schematic is based on this circuit, using a 555 timer as a clock source:

Led chaser

I changed it a bit by having the 4017 outputs drive transistors that switch current to the pitch pots (instead of turning on LEDS). Also, I triggered the chips RESET on step 4 instead of using all ten steps.

Simple 555 Synth

I'm starting a new project that will hopefully get me motivated to make some tracks. It's called 'One Instrument a Week', and it's exactly what it sounds like! I'll be building one simple music instrument or effect a week for the next year, and using them in my experimental Year of the Duck project.

Here's the first entry, a simple synth I built over a weekend based on a 555 timer IC. I used this schematic as a starting point:

555 Synth