Aion Electronics Blueshift Chorus Manuel - Page 15
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Setting the bypass method
The bypass method must be set by using jumpers on the optocoupler and following the
corresponding wiring diagram. The diagrams to the left show the jumper positions for each
bypass mode. It's easiest to set these on the top (non-component) side of the board. The
silkscreen on the PCB shows the jumpers in "Stock" mode.
The stock bypass option mimics the signal path of the original circuit, with the signal passing
through pre-emphasis and de-emphasis filters.
The minimalist bypass option splits the signal immediately after the first op-amp. The bypass is
still buffered for the stereo output, but the signal only passes through that single op-amp buffer.
Since this is a stereo-splitting effect, I've intentionally not accounted for true bypass. Passive
signal-splitting can be very problematic unless you know what's going on in your signal chain.
With that disclaimer, you can probably wire it up as true bypass without too much trouble as long
as you have a 4PDT stomp switch—but you're on your own if you do! I haven't tested this and it is
beyond the scope of this documentation.
Since there are a lot of wires in multiple layers inside a small box, the wiring diagrams on pages 13 and 14 can
be a little hard to follow. Use the table below and cross-reference it with the corresponding wiring diagram.
Pad
Description
A
Circuit input
B
Ground
C
Channel B buffer send
D
Channel B effect send
E
Channel B switched output return
F
Channel A buffer send
G
Channel A effect send
H
Channel A switched output return
I
Channel A pre-IC switch return
J
Channel A pre-IC switch send
K
Channel B pre-IC switch return
L
Channel B pre-IC switch send
M
Channel B ring
N
Optocoupler LED switched ground
O
Channel B output
P
Channel A output
+9V
Supply voltage (bottom board)
GND
Ground (bottom board)
The stomp switch lugs use the standard numbering system, shown in this diagram:
BLUESHIFT CHORUS / BOSS DC-2 DIMENSION C
Stock Bypass
Input jack tip
Star ground point
No connection
Jumper to pad E
Jumper to pad D
No connection
Jumper to pad H
Jumper to pad G
Switch lug 5
Switch lug 4
Switch lug 2
Switch lug 1
"B" output jack ring
Switch lug 7
"B" output jack tip
"A" output jack tip
DC jack
Star ground point
1
4
7
2
5
8
3
6
9
Minimalist Bypass
Input jack tip
Star ground point
Switch lug 3
Switch lug 1
Switch lug 2
Switch lug 6
Switch lug 4
Switch lug 5
Jumper to pad J
Jumper to pad I
Jumper to pad L
Jumper to pad K
B output jack ring
Switch lug 7
"B" output jack tip
"A" output jack tip
DC jack
Star ground point
STOCK
MINIMAL
15