Projecttitel: PT-Audio Dual DCO
STATUS finished
Startdate: 01.07.2013
Duedate: 23.02.2014
Manufacture link: http://www.muffwiggler.com/forum/viewtopic.php?t=70449&start=200&postdays=0&postorder=desc&highlight=ptaudio
shop: synthcube
building from muffwiggler Forum 2013/2014
Pictures from other customers, only for demonstration view
Gallery |
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Tech:
It is based on DSS (Direct digital synthesis) and is running on a ATMega 328p chip.
Both oscillators share a set of 4 * 8 Wavetables that can be interpolated.
It has 8 modes of operation:
- 1. Phase mod 1->2, 2->1
- 2. Saw mod
- 3. SampleWrap
- 4. BitCrush
- 5. PhaseCrush
- 6. Bitkill
- 7. And/Or
- 8. Sync 1->2
(still not 100% set in stone as so many variations sound cool)
pitch tracking is 5 octaves, 1V/oct. And can be offset +5 octaves with the coarse/fine controls. Additionally the pitch can be modified by the pitch mod inputs +/- 5 octaves.
Osc1 can be switched down one octave, and osc2 switched down 8 osctaves.
Osc2 can either follow osc1 or run free, by flipping the link switch.
All CV inputs are 0-5V but the pitch mod that is -5/+5. All inputs are protected against voltages outside that range, but inputting a non expected voltage may result in unexpected behaviour wink
Build Manual:
BOM:
Frontpanel Files:
2u_motmformat_dual_digital_oscillator_748_01.svg
2u_motmformat_dual_digital_oscillator_748_01.fpd
2u_motmformat_dual_digital_oscillator_748.fpd
2u_motmformat_dual_digital_oscillator_mdota_137.fpd -> the right frequency pot/coars is a pushpull pot - to enable the link between OscA/OscB
Building Tips:
The *100n caps are the output filtering caps. I found that 100n is a bit too mellow for my taste and went with 10n instead. That is what you hear in the latest demos. In the BOM they are marked as 10n*.
for MOTM Format:
by usage of 15Volts change the both trimmer from 10K to 25K
Wiring:
