Q1 in the accent circuit should be a JFET transistor with a DSG pinout. A few different types will fit here. We've
tried the J201, MPF102 and 2N5457, and they all seem to work okay. The DR55 actually uses a 2SK30AY in this
position. This will also work but you'll have to check the pinout and rotate the part accordingly. The correct DSG
pin positions are marked on the board.
Next install the trimmer pots at VR1 and VR2, the inductor at L1, the LM324 quad opamp, and any pin headers you
want to use for the off board connections.
Power:
The board is powered by 12v DC. On the bottom left of the board you can see a 2x5 pin power connector. Only the
pins on the right labeled with the larger GND and +12V text are actually used, but the 10 pin connector is provided
for the standard eurorack format. Please note that due to its size, this PCB is not designed specifically to be used in
a eurorack module, but we used this connector just in case somebody wanted to try and bodge something
together. In normal use you can just use the GND and +12V connections with the larger font.
If you haven't installed the trigger conditioning circuit then you will have left out the 9v regulator. In this case you
can run the voice circuits from a 9v input instead of 12v if you wanted to. Either will be fine.
Inputs, outputs and pots:
The wiring diagram for the inputs, outputs and pots can be found on the next page.
The diagram shows all the pots viewed from above. The accent amount pot should ideally be an antilog pot,
commonly known as a C curve pot, but a linear B curve pot can be used at a push, or a normal A curve log pot if
you use the left hand pin and wire it in to operate backwards. You can use a 470K pot if you are in Europe and
500K is not readily available.
Note that the pin assignations for the two TRIG IN connectors are different.
Summary of Contents for CB55
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