v.3 Custom Preamp
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Product Information
Specifications:
- Product Name: Fodera Custom Preamp v.3
- Features: Volume Tone Board, Bass Board, Mid Range Board,
Treble Board - Connectors: 5 Pin from Volume/Tone board, 6 Pin to Mid Range
Board, 4 Pin to Treble Board
Product Usage Instructions
Ext Balance 1234 Setup:
If Balance Pot is removed and special wiring is needed, such as
a Volume/Blend stacked pot, use Ext Balance 1234.
Coil Tap Wiring:
Parallel and Split Operation: Connect the hot
of the second coil to the To tap terminal and place jumpers on the
Neck tap and Bridge tap positions on the jumper block.
Series and Split Operation: Connect the hot of
the second coil AND the ground of the first coil to the To tap
terminal and do NOT install jumpers on the Neck tap and Bridge tap
positions on the jumper block.
Volume Tone Board:
Adjust gain using the provided jumpers to set how much gain is
added to your signal when the active preamp is engaged and the EQ
is set flat.
Bass Board:
Configurations for Bass / Treble Shelving Jumpers to adjust bass
and treble shelf frequencies.
Mid Range Board:
To set the two frequencies for your Mid Frequency, remove and
add resistors on the board labeled LM. Use jumpers D, E, F, G for
Hi Mid Frequency selection switch.
Treble Board:
Connect the 4 Pin Connector from Bass Board to complete
setup.
FAQ
Q: How do I adjust the gain on the Volume Tone Board?
A: Use the provided jumpers to select the desired gain level
based on your preference.
Q: What should I do if I need to configure the Mid Frequency
settings?
A: Remove and add resistors on the board labeled LM for
adjusting Mid Frequency settings.
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Fodera Custom Preamp v.3
1. Pickup Pan Board 1. Ac&ve Power for EMG’s 2. Neck Hot – outer coil 3. Neck Hot inner coil 4. Neck Grounds 5. Universal shield and ground 6. Bridge Hot outer coil 7. Bridge Hot inner coil 8. Bridge Grounds
Jumpers · CTB Coil Tap Bridge in for Parallel Coil Tap (default) Out for Series Coil Tap · CTN Coil Tap Neck - in for Parallel Coil Tap (default) Out for Series Coil Tap · EN EMG Neck Adds 28k to the 250k Balancer for EMGs or other ac&ve pickups · EB EMG Bridge – Adds 28k to the 250k Balancer for EMGs or other ac&ve pickups · BB- Bartolini Bridge – Adds 180k to 250k Balancer to contour tapers for Bartolinis and pickups with similar impedance · BN Bartolini Neck – Adds 180k to 250k Balancer to contour tapers for Bartolinis and pickups with similar impedance
Connectors a. 4 Pin Coil Tap Switch to coil tap switch b. 3 Pin Ac&ve Passive out to Volume Tone Board
“Ext Balance 1234” can be used if Balance Pot is removed and special wiring is needed such as a “Volume/Blend” stacked pot. (Used in our “Mini MB Presenta&on” model)
NOTE ABOUT COIL TAP WIRING: For parallel and split opera&on connect the hot of the second coil to the “To tap” terminal and place jumpers on the “Neck tap” and “Bridge tap” posi&ons on the jumper block. For series and split opera&on, connect the hot of the second coil AND the ground of the first coil to the “To tap” terminal and do NOT install jumpers on the “Neck tap” and “Bridge tap” posi&ons on the jumper block.
A NOTE ON SHIELDING AND GROUNDING: The fact that a shield and a ground are oden supposed to be at the same poten&al (0V) does not mean they can be treated as the same signal. We’ve gone to great lengths to ensure that the ground/shield treatment in this preamp Is cufng edge and maximizes the benefits of a true, low impedance, driven ground. Therefore, a few steps need to be taken in Installa&on. 1. The output jack should NOT be mounted to the foil shield in the control cavity. Cut the foil away around the moun&ng hole. The only electrical connec&ons to that jack should be the 3 wires that go to the switch board. 2. If your pickups have a “drain” or braided wire in addi&on to the hot and ground wires, it should be connected to the Shields terminal on the terminal block. This DOES NOT APPLY TO EMG PICKUPS or pickups with a single conductor and a shield. In this case, the shield wire IS in fact ground. 3. All shield wires including the bridge ground wire, any wires coming from the pickup cavi&es, and wires ajached to the backs of pots should be connected at ONE POINT on the foil cavity shield. From that point, one wire should be run to the Shields terminal on the terminal block.
2. Volume Tone Board
Jumpers when open 22nF with 250k tone pot · Dark adds 22nF 44nF total · Deep adds 47nF 69nF total, 91nF if both jumpers are installed
Connectors a. 4 Pin Black and Red 2x 9V connectors b. 5 Pin Ac&ve EQ c. 3 Pin Purple Orange and Green To output jack d. 3 pin Ac&ve passive to Ac&ve Passive Switch or can be hardwired with jumpers o 1-2 passive o 2-3 ac&ve e. 3 Pin Ac&ve Passive from Pickup Pan Board f. 3 Pin Standby switch can be hardwired with jumpers on 1-2 to bypass (default) The volume/tone pot can be removed and a single 250k audio taper pot can be installed for a single pot tone control. Volume func&on can be accessed using slots “1234” on the Ext Vol connector. Slots 3+4 of this connector can be connected to a momentary NC switch for push bujon kill func&on. Ext Power slots 123 can be used for setups requiring Ghost Power
3. Bass Board
Gain Adjust Jumpers – These jumpers affect how much gain is added to your signal when the ac&ve preamp is engaged and the EQ is set flat.
Gain Added
A
B
C
0.0 dB
Out
Out
Out
(same output level
as passive)
1.8 dB
In
Out
Out
3.3 dB
Out
In
Out
4.6 dB
In
In
Out
5.7 dB
Out
Out
In
6.7 dB
In
Out
In
7.6 dB
Out
In
In
8.4 dB
In
In
In
Bass / Treble Shelving Jumpers
In
L
Bass shelf at 40Hz
T
Treble Shelf at 6kHz
Out 100Hz 10kHz
Connectors a. 5 Pin from Volume/Tone board b. 6 Pin to Mid Range Board c. 4 Pin to Treble Board
4. Mid Range Board
To set the two frequencies you can switch between for your Mid Frequency (Low Mid Frequency if preamp is 4 band) you must remove and add resistors on the bojom side of the board labeled “LM”
LM1
LM2
LM3
LM4
Mid Switch Mid Switch
Down Hz
Up Hz
In
Out
In
Out
330
1200
Out
In
Out
In
400
1500
In
In
In
In
300
600
In
Out
Out
In
330
930
Out
in
In
Out
400
1800
Jumpers D E F G select the “Hi Mid Frequency” for 4 Band EQ’s with a Hi Mid Frequency Selec&on Switch.
D
E
F
G
Switch Down Switch Up Hz
Hz
In
Out
Out
Out
1400
1800
Out
In
Out
Out
1000
1800
In
In
Out
Out
750
1800
Out
In
In
Out
750
1400
In
Out
Out
In
750
1000
Connectors
a. 6 Pin from Bass Board b. 4 Pin to Mid Selector Switch (Lo Mid Selector if 4 Band) c. 4 Pin to Hi Mid Selector Switch or can be hardwired · Jumper on 1-2 for lower of HiMid Frequencies selected with jumpers DEFG · Jumper on 3-4 for higher of HiMid Frequencies selected with jumpers DEFG d. 4 Pin to Hi Mid Pot (for 4 band EQ)
5. Treble Board
4 Pin Connector from Bass Board
Documents / Resources
 |
Fodera v.3 Custom Preamp [pdf] Instruction Manual v.3 Custom Preamp, v.3, Custom Preamp, Preamp |