The power and signal pads on the PCB conform to
the FuzzDog Direct Connection format, so can be
paired with the appropriate daughterboard for
quick and easy offboard wiring. Check the separate
daughterboard document for details.
Be very careful when soldering the diodes and
transistors. They’re very sensitive to heat. You
should use some kind of heat sink (crocodile clip or
reverse action tweezers) on each leg as you solder
them. Keep exposure to heat to a minimum (under
2 seconds). Same goes for the ICs if you aren’t
using sockets.
Snap the small metal tag off the pots so they can
be mounted flush in the box.
You should solder all other board-mounted
components before you solder the pot. Once it’s in
place you’ll have no access to some of the board.
*FETs
You need to use a matched set of FETs for this
build. The board is designed for 2N5457. If you’re
using different FETs check your pinout.
BIASING
Use the bias trimmer to adjust the voltage at the
gates of the FETs. You can do this by ear, simply
tweaking until you get the best phasing effect. If you
want to do it by numbers it should be around 3V.
**FEEDBACK
We’ve added space for a trimmer for the feedback
setting. The standard parts for this are:
Script logo version - empty - no feedback
Block logo version - 22K resistor
So it’s up to you. Leave it out, put the 22K across
the trimmer pads shown in red above, or use a
trimmer and adjust to taste. If the latter, use a
47-50K trimmer, set it to the middle position and
tweak it either way until you’re happy.
There are extra pads provided for the trimmers so
you can use several different types. Just drop the
pins into the holes as they naturally fall. Lines
shown above show which pads are internally
connected on the PCB.
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22K resistor across
these pads if going
for that option.
See below.
Summary of Contents for PHASE 90
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