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INSTALLATION INFORMATION
EMG MODEL: B122 VOLUME CONTROL
(ACTIVE PICKUP INPUT 25K OHM, BLACK PC BOARD)
(PASSIVE PICKUP INPUT 500K OHM, GREEN PC BOARD)
General Operation
The B122 Volume control is included with each EMG Pickup and Pickup System. There are two versions, 25K Ohm for Active EMG's and 500K
Ohm for EMG-HZ Passive Pickups. The 25K Ohm control has a black PC Board, the 500K has a green PC Board, both are Audio Taper. The wiring
configuration is the same for both 25K and 500K Controls. There are 6 header pins, (3 pairs of signal and ground) two of the pairs are for
in/out, the third pair is for tone send or daisy chaining. Examples are shown in the included diagrams. The B122 features plug-in compatibility
with all EMG Pickup Systems by using .100 (2.54mm) standard pin spacing. You can solder to the input and output of the control by using the 4
solder pads on the PC Board if connectors are not available, 2 of the solder pads are for input/output and the other 2 pads are for ground.
Schematic Diagram:
B122 Volume Control
VOLUME
1
2
3
4
5
6
B122rH
SCHEMATIC NOTES:
The Schematic diagram above shows how the B122 Volume control is configured.
Pins 1 and 2 are the input or output of the CW (Clockwise) terminal of the control.
Pins 3 and 4 are the input or output of the W (Wiper) terminal of the control.
Pins 5 and 6 are duplicates of pins 1 and 2, the CW terminal (Clockwise).
Pins 2, 4, and 6 go directly to ground, the CCW (Counter-Clockwise) terminal of the control
SOLDERING:
If you don't have connector cables, or prefer to solder to the control,
terminals are provided. The diagram below shows the pads for soldering.
The EMG coax cables for wiring the guitar are a 2-pin pair,
The signal or "Hot" wire is White, the Ground (Shield) wire is Black.
© 2009 Copyright EMG INC. All Rights Reserved.
1
IN/OUT
2
GND
3
IN/OUT
4
GND
5
IN/OUT
6
GND
SOLID SHAFT
1.260
W
A25K
A500K*
*HZ VALUE
SPLIT SHAFT
Dimensions:
B122 Volume Control
8mm Dia.
P.75
.510
CCW W CW
W (WIPER)
INPUT/OUTPUT
CCW (COUNTER-CLOCKWISE)
GROUND (2 PADS)
CW (CLOCKWISE)
INPUT/OUTPUT
.400
.650
.965
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Summary of Contents for EMG B122 Volume Control
- Page 1 The B122 Volume control is included with each EMG Pickup and Pickup System. There are two versions, 25K Ohm for Active EMG’s and 500K Ohm for EMG-HZ Passive Pickups. The 25K Ohm control has a black PC Board, the 500K has a green PC Board, both are Audio Taper. The wiring configuration is the same for both 25K and 500K Controls.
- Page 2 Diagram NOTES: Diagrams #1 and #2 perform the same function. Diagram #1 shows the pickup input going into the CW pair (pins 1 and 2). Diagram #2 shows the pickup input going to the CW pair (pins 5 and 6). Again, pairs 1-2 and 5-6 are interchangeable, both are the CW pair.
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