ClinchFX Clean Boost EP+ Operating Instructions page 2

Power Supply
The EP+ is designed to operate from a 9V or 12V DC supply. Maximum allowed
voltage is 12V DC.
The EP+ has an internal Charge Pump power supply that boosts a 9 Volt supply to
around 17.3 Volts or a 12 Volt supply to around 23.2 Volts. If the 12 Volt maximum
power supply is exceeded, the internal voltage will exceed the ratings of the Charge
Pump IC. We have designed in some protection against short term excess voltage,
but continued operation from a supply greater than 12 Volts DC will cause the
electronics to fail.
External Power Supply
Power can be supplied from a 9V or 12V DC regulated power pack with a 2.1mm
coaxial plug with negative connected to the centre pin. The power pack should be
rated at greater than 20mA. The pedal is protected from reverse power connection by
a diode, reverse connected across the positive and negative contacts of the DC jack.
If an incorrectly polarized or AC supply is connected, this diode will effectively short
circuit the supply, protecting the pedal circuitry from damage. If an incorrect power
supply remains connected, the power supply will be damaged.
Battery
I do not recommend powering the EP+ from a battery, but a battery compartment is
provided for powering the pedal from a 9V battery.
To access the battery compartment, peel off the non-slip base, which is attached with
genuine Velcro, commercial quality, hook and loop tape. Remove the four screws that
hold the bottom of the box in place.
The battery snap is held to the inside of the box with Velcro. Separate the Velcro and
attach the snap to the battery. The battery will fit between the switch and the end of
the box. The pedal serial number is also located in this area.
Replace the bottom of the box and the non-slip base. Note: The bottom of the box
has foam rubber on the inside, but the rubber does not cover the area where the
battery sits. If the bottom is the wrong way round, it won't fit over the battery.
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EP+ Description
The EP+ is a clean boost that can boost a guitar signal by up to 18db. The volume
control goes all the way to zero, allowing the EP+ to be used for Unity Gain if
necessary. At the same time, the EP+ adds that almost intangible magic tone of the
famed Echoplex® EP-3®.
For those who are technically minded, we took the successful EP-PRE circuit and
added another Common Source JFET stage to provide the boost. This second stage
is not a buffer, but it gives the EP+ a lower output impedance than the EP-PRE. The
lower output impedance will allow longer cables between the EP+ and the amp
without losing high frequencies.
Using the EP+
Foot Switch
The switch is 3PDT, True Bypass and has gold contacts for reliability.
Note:
The switch can assume a "half-operated" state if the plunger is bumped during
travel and set-up. This is a characteristic of the switch mechanism and not a fault.
Always fully operate the stomp switch once before using the pedal.
Volume Control
The Volume control works like most volume controls. When fully counter-clockwise,
there is no output from the pedal. When fully clockwise, pedal output is maximum.
PCB Jumper
The EP+ uses the new EP circuit board that allows you to
select the tone of either early model EP-3 (S/N 9068 to
9450) or later versions.
When you remove the back cover from the EP+, you will
see the rear of the PCB with the jumper fitted to both
terminal pins. This will give the tone of the early EP-3.
To get the tone of the later EP-3, remove the DC power
plug and/or battery. Gently slide the jumper to the right so
that it slides off both pins. Then slide the jumper back on
to one pin only in order to prevent losing the jumper, in
case you wish to change back to the original EP-3 tone.
Re-connect power or battery, connect your guitar and amp
and try the tone.
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