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*.
copy from muffs:
Here's a mod idea: use a switching jack for the Wave CV in and connect the switch to 5v. That way the Wave pot will sweep through the table manually when no cable is inserted into the jack.
If you do this, please use a current limiting resistor to protect anything you plug in here. 100 -200 Ohm should be enough.
for MOTM Format:
by usage of 15Volts change the both trimmer from 10K to 25K
Wiring: