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2010 FiveFish Studios
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X-12 Microphone Preamp Kit
INPUT TRANSFORMER
The Input Transformer we’re using provides impedance matching, signal isolation, and “flavor enhancement” to our signal. It’s a
High-Nickel Input Transformer with Mu-Metal shielding.
Note: There is a resistor R2/RLS near the Input Transformer. This is a loading resistor. Changing this value will
allow you to experiment with the sound of the unit. The included R2/RLS resistor in the kit I think gives the best
balance of gain and sound quality.
OUTPUT TRANSFORMER
Our output transformer provides signal isolation, and is wired as 1:2, which provides 6dB gain. Since it’s also in the signal path,
it will also give some coloration to the signal.
Strip the wires and solder the different colored wires to it’s correct location on the PCB. The PCB is labeled with the wire color it
should accept. Make sure to solder the colors in the right location, otherwise, your preamp may not work.
From left to right, the colors are:
GRAY, VIOLET, BLUE, GREEN, YELLOW, ORANGE, RED, BROWN
Try to keep the wiring clean and organized.
OPTIONAL: You may want to wrap it around with copper tape as shown above in the photo. (Copper tape not included in kit.) It
makes for a more nicer look, in my opinion.
