Aion Electronics BOSS DC-2 Dimension C Manual - Page 6
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Dual op-amps: The original DC-2 uses SIL op-amps for layout purposes, all of which are obsolete. Since
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IC1 and IC12 are in the signal path, you'll want to use op-amps that are designed specifically for audio. The
OPA2134 is a great choice, but a regular TL072 should do fine as well.
Compander: The NE570 and NE571 companders (both ICs are cross-compatible) are out of production
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in DIP format. They can still be found NOS, the NE570 being much more common, but if you'd rather use
something that is new and in production, the CoolAudio v571 clone is available from Small Bear Electronics.
Clocks and BBDs: The original DC-2 uses the MN3207/MN3102 combination for the BBDs and clocks.
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These are out of production but can still be obtained relatively cheaply. However, you can also opt for one of
two current-production BBD+clock pairs, the CoolAudio v3207/v3102 or the Belling BL3207/BL3102. Both of
these are available at Small Bear Electronics.
Toggle switches: The toggle switches must have at least a 0.35" (8.89mm) bushing. This is the most
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common bushing length, but a few from Mouser's "Mountain Switch" brand do have a shorter 0.28" (7.1mm)
bushing. This shorter bushing will not allow enough space for the top PCB to clear the jacks.
DC jack: This project uses a miniature unswitched DC jack like
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(available from several other suppliers as well). You can probably fit a standard-sized DC jack here—the cutout
on the top PCB is wide enough—but the main issue will be the clearance above the bottom PCB. There's very
little margin for error, such that even the height of the solder on the pads on the bottom PCB will be a factor.
Screws: If you have a countersink drill bit, you can countersink the hole on the face of the enclosure and use
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a flat-head screw on the outside so it's level with the enclosure. This is purely cosmetic. If you choose to use
the countersink method, you'll want a 6-32 x 1/4" flat head screw for this.
Pin headers
The two PCBs are connected by pin headers: three 3-position headers and one 5-position header. In order to
have enough clearance between the PCBs, the female headers must be at least 0.325" (8.25mm) in height
when mounted to the PCB. Tayda Electronics has them for about 5 cents each, and in my experience they
connected more tightly than the ones from Mouser. Their
Mouser carries a 5-pin header in the correct height, but not a 3-pin. So if you want to order from Mouser, you'd
be better off getting
one 16-pin header
snap them apart by bending them, the plastic housing will often crack. You'll need 14 of the 16 sockets.
You'll also need the male pin headers as well, the type with pins on both ends.
Tayda has one
here. Tayda is significantly cheaper and the quality is the same.
MN3007 and MN3101
The Blueshift does not support the MN3007/MN3101 chipset. These ICs require a minimum 9V supply voltage.
Since the DC-2 circuit uses a regulated voltage from the main supply for the BBDs, and regulators typically
require about 2V of headroom to function, 7V is as high as we can reasonably get from a 9V source. The
original Dimension D rack unit ran at a much higher voltage and was able to use the MN3007/MN3101, but it's
just not possible with the DC-2 circuit as it is. They also use a different pinout.
Mouser parts spreadsheet
Since this is such a complicated build, I created a
Over 95% of the parts can be obtained from Mouser and their prices are great. I spent a great deal of time
selecting the parts, and the PCB layout is designed around them, especially the boxed film & electrolytic
capacitors, so by using this spreadsheet to order, you know you are getting the best possible result.
BLUESHIFT CHORUS / BOSS DC-2 DIMENSION C
5-pin header is here
that snaps apart. Use a razor blade to separate these—if you try to
spreadsheet of parts
this one from Small Bear Electronics
and the
3-pin header is
Mouser has one here
that can be imported directly to Mouser.
here.
and
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