Donner VIPER VOLUME & EXP User manual

READ CAREFULLY BEFORE PROCEEDING
Please keep this manual in a convenient place for future reference.
Connections
Always turn off the power before connecting or disconnecting. Make sure
to disconnect all cables and AC adapter before moving the unit. This will
help prevent malfunction and damages.
Environment Considerations
Avoid using the unit in any of the following conditions that could cause
malfunction:
● Extremely hot or cold places
● Under direct sunlight
● Magnetic fields
● Near heaters and other heat sources
● Sandy or dusty places
● Places that are extremely humid or exposed to splashing water
● Places with lots of vibrations
Electrical Interference
Devices that are very susceptible to interference or that emits powerful
electromagnetic waves (e.g. radios and TVs) should not be placed near
this unit, as interference could occur. Electromagnetic interference could
cause malfunction and could corrupt or destroy data.
Always operate this unit at a suitable distance from these devices.
Handling
Do not apply excessive force to the switches and other controls,
exposing the unit to strong impacts, which could cause it to break.
Do not put foreign objects or liquids into the unit.
Never open the case or attempt to modify the product in any way since
this can result in damage to the unit.
Clean only with a soft, dry cloth.
Precautions
www.donnerdeal.com
The Viper is a passive volume/expression combo pedal features extremely lightweight casing and a small, pedalboard-friendly footprint. 100% analog
signal path and selected smooth taper ensures pure signal-thru and precise response. Viper can be used with a variety of musical instruments and
devices.
Introduction
Owner’s Manual

●Convenient compact size
●Passive volume/expression combo pedal
●No power supply needed
●Works well with common pedals, multi-FXs and more (using as
expression pedal)
●Sturdy, lightweight casing
When using your Viper as an expression pedal, connect the OUTPUT jack to your device's expression pedal INPUT jack with a TRS (Tip-Ring-Sleeve)
cable, and LEAVE THE INPUT JACK UNCONNECTED. We recommend you to use a cable with TRS plugs ON BOTH ENDS (at least the plug
connected to the unit should be a TRS end).
Usage Scenarios
Overview
Features
Input Impedance (Volume Mode): 100k Ohms
Pot Resistance (Expression Mode): 10k Ohms
Dimensions: 148.5mm (D) x 65.5mm (W) x 61mm (H)
Weight: 280g
Specifications
●Volume/Expression Combo Pedal
The Viper pedal combines passive volume pedal and expression pedal in one, which can be used with a variety of musical instruments and audio
devices. The unit can switch between two modes automatically by detecting input jack connection.
●No Power Supply Needed
You don’t need an extra power supply for the unit: connect it to your gear, and DONE! When using as an expression pedal, you may need some extra
settings on the device you’re going to control (depending on devices).
●Pure Analog Signal Path
The Viper features 100% analog circuit design which keeps your sound pristine.
●Carefully Selected Components
The Viper is designed and built with carefully selected components to ensure best sound quality and road performance. The special designed chassis
ensures touring reliability.
Use Viper As A Volume Pedal Use Viper As An Expression Pedal
As the schematic shows, the TRS plug tip connects to the potentiometer
wiper. If the polarity is incorrect, please reverse the polarity (Tip and Ring)
of your cable and try again.
When using as an expression pedal, the potentiometer resistance value is
10kΩ. Please make sure the potentiometer resistance is supported on
your devices.
Connect to
your amp or
other gear
Connect to
your instrument
or other gear
Connect to
other devices
with a 1/4"
TRS cable
Leave it
unconnected
Expression
Schematic Sleeve Ring Tip
Output
Jack
POT