Hi,
to complete my new MFC-101 I modded two Dunlop DVP1 pedals for use as expression pedals. The new steel band drive was tempting and I think these pedals are not only rugged but looking nice, too. Because the DVP1s are actually volume pedals and come with a logarithmic 250k pot, they won't work without a little mod.
So at first I removed the pot and the small PCB which holds three jacks (IN, OUT, TUNER).
I put a Neutrik NRJ6HF-1 into the hole left by the former IN jack. The other two holes got covered with a small aluminium sheet. While I was at it, I decided to drill a hole into the aluminium sheet, just at the center of the position of the former TUNER jack, and fitted it with a mini toggle polarity reversal switch. The lever of this switch was much too long and had to be shortened to not protrude the pedal chassis.
Note: When you have a look inside the pedal, the position for an additional push down switch (e.g. like the one on the Mission Engineering SP1) seems already to be marked. If I had use for such a switch, I think the required hole could easily be drilled out and the original OUT jack's position could be filled with another Neutrik NRJ6HF-1 or the like.
The hardest part was to find an adequate replacement pot which would not only meet Fractal Audio's specs for expression pedals but also fit into the DVP1 without modifications. Well, I did not really find a pot that met all requirements perfectly. In the end I decided for a Dunlop Hot Potz ECB 24C which also seems to be used by Mission Engineering. Because it also is a Dunlop pot I at least expected it to fit into the hole of the original mounting plate... but the diameter of this hole is a tininess to small (about 0.5mm ...) so I had to enlarge it slightly. Further difference between the ECB 24C and the original pot: The ECB 24C has no locking style bushing. This feature is helpful to prevent spinning of the whole pot when only the shaft should turn. I cut a washer of a 1mm aluminium sheet and punched a "locking nose".
After temporarily assembling the pot to the pedal chassis and experimenting a little what beginning position of the pot would work best, at last the washer got sticked to the pot with double-sided adhesive tape.
Installing the prepared pot and its mounting plate into the pedal chassis
and wiring the components finished the job on the hardware.
Now I am tinkering with the idea of getting decals for an appropriate re-labeling...
to complete my new MFC-101 I modded two Dunlop DVP1 pedals for use as expression pedals. The new steel band drive was tempting and I think these pedals are not only rugged but looking nice, too. Because the DVP1s are actually volume pedals and come with a logarithmic 250k pot, they won't work without a little mod.
So at first I removed the pot and the small PCB which holds three jacks (IN, OUT, TUNER).
I put a Neutrik NRJ6HF-1 into the hole left by the former IN jack. The other two holes got covered with a small aluminium sheet. While I was at it, I decided to drill a hole into the aluminium sheet, just at the center of the position of the former TUNER jack, and fitted it with a mini toggle polarity reversal switch. The lever of this switch was much too long and had to be shortened to not protrude the pedal chassis.
Note: When you have a look inside the pedal, the position for an additional push down switch (e.g. like the one on the Mission Engineering SP1) seems already to be marked. If I had use for such a switch, I think the required hole could easily be drilled out and the original OUT jack's position could be filled with another Neutrik NRJ6HF-1 or the like.
The hardest part was to find an adequate replacement pot which would not only meet Fractal Audio's specs for expression pedals but also fit into the DVP1 without modifications. Well, I did not really find a pot that met all requirements perfectly. In the end I decided for a Dunlop Hot Potz ECB 24C which also seems to be used by Mission Engineering. Because it also is a Dunlop pot I at least expected it to fit into the hole of the original mounting plate... but the diameter of this hole is a tininess to small (about 0.5mm ...) so I had to enlarge it slightly. Further difference between the ECB 24C and the original pot: The ECB 24C has no locking style bushing. This feature is helpful to prevent spinning of the whole pot when only the shaft should turn. I cut a washer of a 1mm aluminium sheet and punched a "locking nose".
After temporarily assembling the pot to the pedal chassis and experimenting a little what beginning position of the pot would work best, at last the washer got sticked to the pot with double-sided adhesive tape.
Installing the prepared pot and its mounting plate into the pedal chassis
and wiring the components finished the job on the hardware.
Now I am tinkering with the idea of getting decals for an appropriate re-labeling...
