Mad Bean Pedals Road Rage User manual

RROAD RAGE
2015 edition
FT TYPE: Utility
© madbeanpedals
1.25” W x 0.825”H
2015 change-log: Removed 10R current limiting resistor. Made space for TO-220 sized regulator.
Terms of Use: You are free to use purchased Road Rage circuit boards for both DIY
and small commercial operations. You may not offer Road Rage boards for resale or as
part of a “kit” in a commercial fashion. Peer to peer re-sale is, of course, okay.

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Part Value Part Qty Rating
C1 47uF 47uF 1 25v min
C2 100n 100n 1 25v min
C3 - C7 10uF 10uF 4 25v min
D1 - D3 1N5817 1N5817 3
D4 Zener 9.1/12/15v Zener 1 1W
IC1 Charge Pump IC1 *see notes
REG1 Regulator REG1 15v To-92 or To-220
Overview:
The Road Rage is a utility PCB with multiple functions:
1- Voltage Inverter: Allows you to flip a +9v supply to a -9v supply. This is useful for positive
ground effects such as PNP fuzzes. Using the Road Rage will allow you to use your standard
negative tip power supply or wall wart instead of a special power supply or battery.
2- Charge Pump: Steps up the supply voltage for effects that require something more than the
standard 9v operation. It has one output for 18v (unregulated) and one for 15v (regulated).
Both the voltage inverter and charge pump sections of the PCB can be used simultaneously
giving you a -9v to +18v/15v option.
3- There is also one additional output marked 9v. This output is filtered via C1 and C2 and can be
used to daisy chain the DC supply to another effect or an LED.
4- The Road Rage PCB allows for different types of charge pumps. Some charge pumps require
connecting pins 1 and 8 together for best operation. Accordingly, there is a pair of pads labeled
“BST” under IC1 which should be connected in those cases.

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IMPORTANT: You should connect the wires from your DC jack to pads marked “DC” on the PCB,
NOT the “+9” pad on the left side. The +9v pad on the left side is 9v OUTPUT, not input.
Charge Pumps:
Type Suffix Connect BST Pads? Max Input Voltage Max Current Zener Diode (D4)
LT1054 - NO 16v 100mA 15v
ICL7660 SCPA YES 12v 45mA 12v
MAX1044 CPA YES 10v 20mA 9.1v
TC1044 SCPA YES 12v 20mA 12v
Type: These are the four most common charge pumps used in guitar effects. However, you should be
able to use any pin compatible charge pump so long as it will accept a 9v input.
Suffix: When ordering parts, make sure you get the ones with these exact suffix. The ICL and TC
brands have both “CPA” and “SCPA” types. You need the “SCPA” type. The MAX one only has the
CPA, but that is the correct one to use for the Road Rage. The LT1054 does not have the CPA or
SCPA category.
The two pads labeled “BST” on the PCB must be connected according to the list above. Failure to
connect the BST pads correctly will result in an audible whine in your audio path. The LT1054 is the
only one that does NOT need the pads connected.
Max Voltage: This is the maximum input voltage the charge pump can accept. Note that when you
use higher input voltages, your outputs will scale accordingly; a 12v in means 24v out instead of 18v.
The 15v output on the RR PCB will still be 15v since that is determined by the regulator.
Max Current: This is very important. This is the maximum amount of current the charge pump can
supply. So, why not use the LT1054 for everything since it has the most current output? Because it is
more expensive. If you are using the Road Rage to run a dirt pedal at 18v, one of the other charge
pumps will suffice 99% of the time since dirt pedals tend to draw low current. However, some effects
(like an analog delay or Univibe) will have higher current consumption. In those cases, the LT1054 is
necessary.
Zener Diode: This diode will protect your IC from an over-voltage supply. This is optional (the Road
Rage will work without it) but if you need to protect the circuit from using a wrong power supply, then
use this list to determine what value Zener to use.
Regulators:
The Road Rage is laid out for a TO-220 style regulator. However, you can use the TO-92 style (these
come in the familiar transistor packaging) instead. If using the TO-92 style, flip the transistor 180°
from the drawing on the RR PCB (since it has the opposite pinout).
220 regulator advantages: Higher current output and efficiency. Better heat dissipation.
92 regulator advantages: Smaller package (less than half of the 220).
The TO-92 will probably suffice in most cases as it is rated at 100mA output (which coincides with the
highest current output available from the charge pump list on the previous page). However, the

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efficiency and heat dissipation of the TO-220 style may be more appropriate in cases of circuits with
higher current draws.
How to use the Road Rage:
I need -9v output to power a fuzz circuit
Solder D1, D4, C1, C2, C6 and C7 to the PCB. Omit D2, D3, C3, C4, C5, and REG1 . Connect your
DC jack to the “DC” pads and take your output from the -9/G pins (-9v and ground). BTW: ground is
ground. No matter if you are using a positive or negative ground circuit always connect ground from
the Road Rage to the ground on your circuit. In the case of a fuzz, we just connect -9 to the -9v
supply pad on the fuzz circuit board. It is that simple.
I need +18v output for my overdrive pedal (or whatever)
Solder everything except C6, C7, REG1 and C5 to the Road Rage PCB. Connect your DC jack to the
“DC” pads and take the output from +18/G. Jumper the two C7 pads to connect pin5 of IC1 to ground.
I need +15v output for my overdrive pedals (or whatever)
Solder everything except C6 and C7. Connect your DC jack to the “DC” pads and take the output
from +15/G. Jumper the two C7 pads to connect pin5 of IC1 to ground.
I need all the voltage outputs to use a power supply for my breadboard or really weird effect pedal
Solder everything. Connect all the outputs.
TC1044SCPA: http://www.mouser.com/ProductDetail/Microchip-
Technology/TC1044SCPA/?qs=cC9UkDmCsZtU9kTPnqaTBA%3D%3D
MAX1044CPA: http://www.mouser.com/ProductDetail/Maxim-
Integrated/MAX1044CPA+/?qs=sGAEpiMZZMtitjHzVIkrqUa%2f3DrsydEwOqnTvjSnloI%3d
ICL7660SPCA:
http://www.mouser.com/ProductDetail/Intersil/ICL7660SCPA/?qs=sGAEpiMZZMtitjHzVIkrqV%252bHSB1sTPSiEqkubgSA
yfE%3d
LT1054: http://www.mouser.com/ProductDetail/Texas-
Instruments/LT1054CP/?qs=sGAEpiMZZMtYFXwiBRPs0842JnZv3v5p
If you pruchase the Road Rage panel there are 6 PCBs included. This panel is v-Scored so you
will need to break the individual boards apart. Gentle finger pressure is all that is required to
separate the boards.