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MICRO BOOSTER ONBOARD PREAMP
FOR GUITAR & BASS
INSTALLATION MANUAL
SPECIFICATIONS
Input impedance: >1MΩ
Output Impedance: ~10KΩ
Battery Voltage: 9VDC ±10% up to 18VDC
Recommended Battery: Alkaline
Power Consumtion: 1mAh in use; 0.1mAh without input signal
Product Size: Lenght: 32.5mm, Depth: 25mm, Height: 25mm
Product Weight: 30 gr.
Packed Weight: 135 gr.
RoHS Compliance
ADVICE, WARNING & CAUTIONS
- USE WIRING DIAGRAMS FROM OUR WEBSITE AS STARTING
POINT!
- Read this manual before installation and keep it handy.
- Never pull up the push-push switch-pot by force.
- Remove the knob from the switch-pot only when switch is in UP
position.
- Do not exceed 19VDC when powering booster's circuit.
- We recommend using metal shielding where the preamp is to be
installed.
- When soldering and desoldering do not overheat the circuit boards
or any electronic component.
- If sharp tools are to be used in installation, handle with care and
never use force to have things done.
- Make sure the battery is properly attached to the battery snap-on
connector.
- Do not place the electronic circuit & battery in direct sunlight, in
extreme temperature and humidity conditions, or in dusty
environment.
- Do not make modifications to the circuit and do not install the
preamp in any other way except as described in this manual.
-
This manual may be changed or modified without notice so we
advise you to download it from the website before installation.
INTRODUCTION
Usually, your guitar is wired like this:
The booster will come latest in the guitar signal path, after the
pickups, volume & tone controls and pickup switch. Its electronic
circuit board is soldered on a Push-Push switch-pot. Push once - the
signal goes through booster circuit (the knob will go a little higher, so
you will notice the booster is engaged); push again - the signal is in
TRUE BYPASS - when switch is off, signal is wire-routed straight to
the output jack.
The potentiometer side of the switch-pot IS NOT part of booster's
circuit, and is meant to replace volume or tone potentiometer in
your instrument for the convenience of having a routing switch and a
potentiometer in one device. Potentiometer has to be rewired just
as it used to be - passive. If it is the tone control that is put in place
of, the tone capacitor has to be moved to the new pot as well.
A 10 pin header connector is available on booster's PCB. Starting
from top to bottom while watching the SMD side of the circuit
board, as shown above, these pins are:
A, B, C
- corresponding to potentiometer lugs (which will replace
actual potentiometer in your guitar). This is where wires Gray, Purple
and Blue will be connected. These pins in the header connector are
doubled by
soldering
holes on the circuit board.
They
also
help
to
install the capacitor or hot wire, depending where you install the
booster in your guitar.
A
&
C
are swappable if installed as tone pot.
+
and
-
for connecting the battery. Red wire is positive, Black wire is
negative.
RNG
(ring),
OUT
(tip),
GND
with corrsponding Orange, Red, Brown
wires connect the stereo output connector of the instrument. When
instrument cable is inserted, Ring to Ground powers booster circuit.
IN
and
GND
are the points where White
hot wire
and Black
ground
wire
will be connected. This wire puts switch-potentiometer,
booster circuit and the negative side of the battery to guitar's main
ground.
All these colored wires are supplied and will be connected to the pin-
head connector for a convenient and easy installation.
The mono output connector in the guitar will be replaced as well
with an already wired and included stereo connector. This stereo
connector sends power to booster's circuit as long as guitar cable is
inserted. The instrument's cable plug has to be mono TRS plug.
PREPARATION
We strongly recommend you to shield the electronics compartiment
in your instrument with sticky cooper shielding foil, if it's not done
from the factory already.
Be sure to connect this shielding to guitar's main ground point.
By now, you've probably chosen which control you are going to
replace: the tone or the volume pot of your instrument.
INSTALLATION
We provide a handful of Wiring Diagrams on product's web page.
Please consult them first! Most likely you will find your setup right
there.
We remind you that potentiometer side of the switch-pot is not
part of booster's circuit, and is going to remain passive in your
guitar circuit as before. The switch side of the switch-pot is used to
