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Hi. My name is Scott Metoyer

This is what I'm working on.

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.

The sound is generated by a toy piano that I hacked up. Each of the four steps in the sequencer is routed through a 100K pot that varies the resistance to the piano and triggers different notes. I also threw in a touch point for garbling up the sound.

Here it is in action:

About the author

Scott Metoyer