Build Notes
Assembly should be straightforward, but contact me if you'd like a detailed build doc <mark@mas-
ects.com>.
Hookup
•
BO
(Board Output)
: Connect this to the "Output" of your audio PCB
•
BI
(Board Input)
: Connect this to the "Input" of your PCB
•
JO
(Jack Output)
: Connect this to the tip of your Output jack
•
JI
(Jack Input)
: Connect this to the tip of your Input jack
•
LED
: Supplies 5V when e
ff
ect is engaged. See "Adding an LED" below.
•
J1
: These two pads can be connected to enable Optocoupler Muting
•
AG
: See "Audio Ground / Digital Ground" below
•
GND
: Connect this with all the other ground points of your pedal
•
SW1, SW2
: Connect these to the two lugs of a SPST, normally open, momentary foot switch
•
9V
:
Connect to your 9V power supply
Optocoupler Muting
By default, no muting is done.
However, you may
fi
nd you have a noisy audio circuit that tends to pop when engaged or disengaged. When
this occurs you can connect the J1 jumper pads to temporary mute (~35ms) when engaging and bypassing.
You can either directly connect them with a wire or solder, or use a switch. If you use a switch please note that
this setting is only checked when the board is
fi
rst powered up.
Adding an LED
The LED solder pad
(or pin 3 of v1 - see below)
supplies 5V when the e
ff
ect is engaged. You can use this to
control or directly power your LED.
Look at the schematic above to see 2 options for hooking up an LED.
For a single, low-to-moderate current LED you can simply connect an LED in series with a resistor to this pad,
and run the other side to GND. This is illustrated in "Option 2" of the schematic.
Because the power from this is supplied by the 78L05 voltage regulator, it is not suitable if you need more
than a small amount of current or if you want higher than 5V. In this scenario you can use an common
transistor to switch one or more LEDs as shown in "Option 1" in the schematic.
Audio Ground / Digital Ground
The
AG
and
GND
pads on the PCB are connected, and are all part of the ground. You can simply use the
AG
as
an additional
GND
pad if you'd like.
If, however, you want to separate your audio and digital grounds, e.g. because you're joining them elsewhere
in your pedal, then carefully cut the trace between the
AG
and
GND
pads. There is a small line drawn in the
silk layer showing where to cut. Then solder wires between these pads and your other grounding points.
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