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stahlhart
Platinum Member
1318 Posts |
 Posted - 01/31/2006 : 21:54:36
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Over in Compact Pedals, we were having a discussion about the Dimension C, and RRV-10 expressed dismay at not being able to get to settings in between the four preset buttons on the pedal.
It got me thinking a little, and I looked up the diagram for the DC-2, and here's what I see: it looks as though there are two resistors in the clocking circuit for the MN3207s, and they have values of 22K and 330K ohms. The switchboard appears to put various combinations of open circuits, short circuits, or parallel resistance values across the two of them, such that (if my math is correct) you get the following results --
Mode 1: 22K, 330K
Mode 2: 0K, 330K
Mode 3: 21K, 66K
Mode 4: 20K, 0K
It leaves me wondering if a pair of potentiometers could be substituted here -- perhaps one of them would turn (pun) out to be a rate control, and the other depth... one would be 25K ohm, and the second perhaps 500K ohm, as there aren't any standard pot values between 250K and 500K -- or if something large like 5M ohm were put across the original resistor, you could get close to the 0 to 330K range that way.
The low resistance values suggest to me that you'd have to have some sort of non-linear taper there; not sure about the larger value.
Might this be a worthwhile experiment? Doesn't seem as though it would be too invasive into the DC-2's circuitry.
C.K.
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stahlhart
Platinum Member
1318 Posts |
Posted - 01/31/2006 : 22:02:03
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The other possibility I see might be to leave R36 and R38 in place, and then use 500K ohm and 100K ohm control. Those would be more standard potentiometer values, and would only leave into question the correct taper for each of them.
C.K.
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stahlhart
Platinum Member
1318 Posts |
Posted - 01/31/2006 : 22:07:44
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If it were to work, you could get a 2-control drilled Boss case (i.e. one for a CE-2), and just swap the internals into that, then just drill one additional hole for the second output. Then give the case a custom paint job, and call it the Dimension B.
Keeley and AnalogMan better watch their backs...  
C.K.
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Britsie
Bronze Member
Belgium
92 Posts |
Posted - 02/03/2006 : 10:36:13
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now all you need is a volunteer to 'donate' his DC-2 for this experiment.
Good luck finding one  |
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stahlhart
Platinum Member
1318 Posts |
Posted - 02/03/2006 : 14:50:39
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I'll just volunteer my own...  probably wouldn't take long to rig up for testing; most difficult part would probably be determining the correct values and tapers for the controls. I'll more than likely just put it back to stock afterwards, though, as the button presets seem to work well enough for me. More of a "what if?" experiment than anything else.
C.K.
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RRV-10
Silver Member
Australia
246 Posts |
Posted - 02/11/2006 : 14:00:00
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Keep us informed on how it pans out.
Manual-less owners, don't try and press in two buttons at once (like you could on the Dimension D). Manual claims this may (will?) break the unit. |
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DC-2 Settings
