True Bypass daughterboard with charge pump

True Bypass daughterboard with charge pump
Pumped DB
True Bypass daughterboard
with charge pump
Contents of this document are ©2014 Pedal Parts Ltd.
No reproduction permitted without the express written
permission of Pedal Parts Ltd. All rights reserved.
18V output
-9V output
R1
CLR
R1
CLR
C1
C3
C4
C5
100u
10u
10u
10u
C1
C2
C5
100u
10u
10u
IC
7660S*
IC
7660S*
D2
D4
D5
1N4001
1N4148
1N4148
D2
D3
1N4001
1N4148
This configuration will give you 18V
at the V pad on the connection strip.
Your on-board LED will still get 9V.
Place jumper wire across pads J1-J2
This configuration will give you -9V
at the V pad on the connection strip.
Use this to supply your positiveground effects. Connect the V pad
from the daughterboard to the -9V
connection on your circuit, and
connect Ground as normal. Your onboard LED will still get 9V.
You can wire up your jacks as
normal and daisychain the effect on
your normal negative-ground supply.
Extra GND pads have been included for wiring convenience.
*Use a 7660 chip with a suffix begining with ‘S’, otherwise you’ll likely hear a high
pitched whine from your circuit.
PCB Layout ©2015 Pedal Parts Ltd.
The power and signal pads on the PCB conform to the FuzzDog Direct Connection format.
Be very careful when soldering the diodes. They’re very sensitive to heat. You should use some kind
of heat sink (crocodile clip or reverse action tweezers) on each leg as you solder them. Keep
exposure to heat to a minimum (under 2 seconds). You should really use a socket for the IC. If not,
be extra careful not to overheat.
Negative (cathode) legs of the diodes go to the square pads. That’s the short one on the LED.
Labels on the top side of the PCB are:
V-IN - your positive connection from your DC socket
JI - Jack IN
CI - Circuit IN
V - Circuit Voltage Supply
CO - Circuit OUT
JO - Jack OUT
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