Diamond Boost-EQ User Manual
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Boost-EQ
Clean boost / parametric EQ guitar effect pedal
User Manual
v1.00 • December 22, 2007
Boost-EQ user manual v1.00! 1
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INTRODUCTION
Thanks for purchasing a Diamond Boost-EQ combination clean boost / parametric EQ.
The Boost-EQ combines a very transparent discrete clean boost circuit with a unique selectable parametric EQ combination of a ‘tilt’ EQ and midrange boost/cut filter.
Remember to protect your hearing and wear appropriate hearing protection when playing loud…
DESIGN BACKGROUND
The concept for the Boost-EQ began with a customer request for a
‘compressionless’ Diamond Compressor - i.e. a clean boost circuit
coupled with the Compressor’s tilt
EQ. A custom pedal was built and
shipped that added a ‘pull’ function
on the Compressor’s COMP control
to remove the opto compression
element from the circuit, using the
Compressor’s remaining make-up
gain section as a boost circuit. This
was then followed by the tilt EQ as
usual in the Compressor chain. The
next step in the Boost-EQ evolution was the decision to take the J-Drive MK3 clean
boost circuit and couple that directly with the tilt EQ. This became the first officially announced Boost-EQ (it had a large paddle ‘EQ defeat’ switch where the middle knob usually goes) and was shown at summer NAMM 2007. The pedal worked really well, but it
was decided that a little something extra was needed, so an additional midrange boost/cut
filter was added to the EQ chain, centered at the fulcrum of the tilt EQ ‘seesaw’, to give a
very unique parametric filter combination. This became the official production Boost-EQ
design.
FEATURES
discrete clean boost circuit with JFET input buffering and bipolar drive
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premium audio components, including 2% polypropylene capacitors, 1% metal film resistors,
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Vishay transistors, and a Burr Brown OPA2134 opamp
post-boost ‘tilt’ EQ provides a very musical tailoring of frequency response - seamlessly transi-
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tion from a darker jazz voicing to a brighter jangle, with flat frequency response at the center
detent position.
midrange boost/cut filter placed at the fulcrum of the tilt EQ for a unique parametric EQ re-
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sponse
EQ section can be removed from the signal path via toggle switch
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dual AC capacitive coupling paths for improved transient response
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true bypass signal path
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Boost-EQ user manual v1.00! 2
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