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Technical Overview
Utilizing over 350 carefully selected components, the entire ACV-1 is
designed for a 100% analog signal chain. We began with a classic chorus
architecture using an Xvive™ MN3007 reissue BBDs and a step-up boost
power supply to power our premium audio-grade op amps and high-
tolerance, non-microphonic capacitors, providing performance, temperature
& voltage stability, low noise and maximum headroom.
We then implemented a vintage-style compandor with emphasis/de-
emphasis coupled with two discrete transistor, 5th-order discrete, anti-
aliasing and reconstruction filters to provide a familiar character with
superior clarity, noise reduction, and dynamic feel. The feedback circuit
uses a voltage-controlled transconductance amplifier as a VCA, to provide
classic, warm regeneration tone while offering an accurate method of
dialing in the perfect controllable amount of deep notch cancellation effect.
The input preamplifier consists of a discrete, high impedance, JFET input
stage that can also be used as an always-on buffer. When engaged, the
preamplifier circuit provides impedance matching and gain for optimal
signal to noise ratio. It contains some limiting to provide character from hot
signals and prevent transients from overloading the delay section.
The analog clock, modulation, oscillator, and even the switch logic are all
fully analog. Our VCO, with temperature compensated exponential
modulation, drives the BBD at extremely high current to eliminate artifacts
and provide a clear tight sound and gain consistency. An assignable
expression input increases the flexibility and control available to the user.
The ACV-1 is designed using a multi-layer PCB with dedicated split power
and ground planes for low noise and cross talk. The power input is fully
protected from reverse polarity and over-voltage conditions. Our MHz
range, step up, high voltage power supply is designed to eliminate sources
of noise and radio frequency interference (RFI/EMI) and the I/O is
designed to protect from electrostatic discharge (ESD) spikes to ensure
carefree operation in any studio or performance environment.
