Manualshelf

User Guide

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12
Wiring Instructions
• Preliminary Notes
To prevent 60 Hz hum, the entire Powerbridge™ Pickup signal path should be fully shielded. The control cavity, jack cavity, and
any non-conductive surface to which the controls are mounted (such as a plastic pickguard) must be shielded with adhesive-
backed foil or conductive paint. The shielded cavities should then be grounded.
For complete hum prevention, the included stereo jack must also be shielded. To do this, we’ve included a piece of shielding foil.
Note that one side is insulated. After you have soldered the wires to the jack, roll the foil into a tube so that the insulation is on the
INSIDE and surround the stereo jack with the tube. Connect the foil side of the tube to ground by soldering it to the shielding of
the Powerbridge™ Pickup wire or to a jumper that is connected to any ground.
If your instrument has active magnetic pickups (requiring an onboard battery), you will need a special 9 Pin Switching Jack
(Fishman Part Number ACC-PBR-9PJ), available through your Fishman dealer.
• Wiring Options
There are several different ways to wire the Powerbridge™.
Choose the option that best suits your needs.
Powerbridge™ & Magnetic Pickups wired
directly to a Stereo Jack
1. Connect the Powerbridge™ signal wire directly to the Ring
terminal on the supplied stereo jack.
2. Connect the Powerbridge™ and magnetic grounds to the
Sleeve terminal.
3. Connect the magnetic signal wire to the Tip terminal.
Passive Volume for the Powerbridge™
This circuit that is easily assembled from "stock" guitar pots and
components available at any electronics parts retailer.
You will need:
• 250 k audio taper pot
• 330k resistor
• 820 pF capacitor
• 1500 pF capacitor
This network will attenuate the Powerbridge™ so that it better
matches levels between magnetic and piezo pickups. You can
expect a 14 dB (nominal) decrease in Powerbridge™ output with
this circuit.
NOTE: Optional 3-Way Selector Switch -
If desired, a single pole, double
throw (spdt) 3-way switch can also be added for piezo/magnetic pickup selection.
Use a switch with an ON-OFF-ON orientation.
NOTE: Active Onboard Blending
A Fishman Powerchip™ (not included) must be installed if you wish to blend/mix
piezo and magnetic signals onboard the instrument.
• Active Setup - Powerchip™
With our onboard Powerchip™, you can mix and combine both the Powerbridge™
and magnetic pickups (on the guitar) and plug right into a single channel guitar
amplifier. You can also instantly split signals by simply changing to a stereo cable or
stereo "Y" cable.
See the Powerbridge™ System Users Guide
for Powertronics™ descriptions.
Bridge Installation
• Preliminary
There are two Telecaster
®
Powerbridges™ available from Fishman - each with a
slightly different lead pickup location. Only one of these will fit your instrument.
The Fishman AST Powerbridge™ Pickup fits Fender
®
American Standard
®
Telecaster
®
style guitars. The Fishman VT Powerbridge™ Pickup replaces
"Vintage" style Telecaster
®
bridges.
BEFORE you begin installation, you can make sure you have the correct Tele
®
style Powerbridge™ by following these steps …
1. Check your guitar's original bridge against the provided Fishman
Powerbridge™ Drilling Template by lining up the six (6) string
through-holes with the corresponding marks on the drilling
template.
2. Confirm that the lead pickup location on the original bridge plate
aligns with the Powerbridge™ Template. If so, then go ahead with
the installation.
3. If the template does not line up with the old bridge, the
Powerbridge™ will not line up properly on the guitar. Get a VT
Powerbridge™ and start again.
Follow the same procedure with any aftermarket Tele
®
style bridge to ensure
compatibility with the Powerbridge™ Pickup.
• Installation Procedure
1. Remove the existing bridge. Route the ground wire so that it does
not touch the circuit board on the bottom of the Powerbridge™.
2. Are you absolutely certain that the AST Powerbridge™ Pickup will
fit your instrument? Align the drilling template with the six (6) string
holes in the body of the instrument and fasten it in place with
adhesive tape.
3. Drill the 7/64" (2.8mm) mounting holes.
4. Fasten the lead pickup onto the baseplate of the bridge.
5. Slip the Powerbridge's™ coaxial signal wire under the lead pickup
and into the control cavity. Note that the Powerbridge™ has a
channel milled into the bottom of the baseplate for the signal wire.
6. Fasten the Powerbridge™ with the included mounting screws.
F
ISHMAN
P
OWERBRIDGE
™ P
ICKUP
I
NSTALLATION
G
UIDE
AST
American
Standard
®
VT
"Vintage"
FISHMAN TRANSDUCERS, INC.
340-D Fordham Road Wilmington MA 01887 USA
Phone 978-988-9199 • Fax 978-988-0770
www.fishman.com
TM
Stereo Output Jack
(Tip/Ring/Sleeve)
Electric Guitar Amp
Active
D.I.
PA / Recording Console
Pure Magnetic Signal
(Tip)
Powerbridge™ Signal
(Ring)
Powerchip™
Mono Instrument Cable
Passive Setup
Active Setup
Magnetic
Volume
Sleeve
Ring
Tip
Magnetic
Signal
Stereo Jack
Optional 3-Way
Selector Switch
Mag
Both
Piezo
ON ONOFF
Passive Volume
Direct Wiring