MOTM 520 / MOTM 521
Introduction
The MOTM 520 Cloud Generator is a multi-oscillator module originally architected as a PIC controlling
a bank of hardware NCOs. I was brough on board in mid 2006 to revise the design with an
ARM MCU and FPGA. Since then a prototype based on the Xilinx Spartan 3E Starter Kit from
Digilent, coupled with a Analog Devices ADuC7026 and an audio-quality stereo DAC has
been built and demonstrated at several synth gatherings.
Because the hardware has much more capability than is easily accessed through the '520
user interface, a second module, the MOTM 521 Cloud Expander is under consideration which would provide control of the
50+ parameters, as well as patch storage and additional waveform outputs.
Preliminary Specifications
MOTM 520
- 16 Oscillators
- 48 LFOs
- 48 independent variable bandwidth noise sources
- Square/Pulse output with PWM
- Sine output with 2-op FM/PM
- 1V/Octave Exponential frequency control with Coarse/Fine knobs
- Spread control (oscillator detune)
- Wide/Narrow Spread range
- Chaos control (random FM on each oscillator)
- Phase control
MOTM 521
- 4x20 LCD
- 6 encoders
- USB port for patch management via PC
- Saw output
- Triangle output
- Sync input
- CV patch selection
- Routable CV control of additional MOTM 520 parameters
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Last Updated
:2009-08-05
Comments to:
Eric Brombaugh
