Moogulator

Mark Lewis has owned his Emu Emulator drum machine since the early Eighties. He wanted a way to simply sync up his Moog Little Phatty to trigger eighth notes with the Drumulator. Since the Clock Output of the Emu produces pulses 24 times per quarter note, the clock speed is way to fast for the Moog to even process.

The solution I came up with takes the high frequency pulse train from the Drumulator, and runs it into a CMOS ripple counter. This creates several banks of divisions. Using the last division, the pulses were slow enough, but then the Moog's output was in 3/4 time, not 4/4.

I then took the ripple counter's output divided in less stages, and ran that to a 4017 decade counter. Using two outputs of the 4017, I was able to make the Moog trigger in 4/4.

Also, I added a toggle switch to invert the pulses. So, if the pulses are off by a beat, flipping the switch will get everything in time again.

The power switch lights up when on, and flashes to the tempo when it receives a pulse train from the Drumulator.

The black case I used for this is the same case I used when I built the Micro Casket in 2007. It's the case for a laser pointer.