User manual

AMP Module

Description

From Designer Tim Caswell’s own hand: The amplifier (AMP) is a 2 stage Class A discrete design using three pairs of hand matched

transistors. Envelope is usually applied to ST1 CV1; ST1 CV2 goes thru an attenuverter and can be used for envelope or modulation;

ST2 CV1 goes to the 2nd stage, and is typically used for volume control; ST2 CV2 goes thru an attenuverter providing access to the final

stage of modulation input.

The AMP, the 5089, and the 3003 are Class A circuits. They draw more current from the +12 rail than from the -12 volt rail. If the

system power supply is under-sized, hum or buzz may be heard. In that case, larger filter capacitors and/or a larger power transformer

will be needed. The 4075 draws equally from both rails, and is more immune to hum. Like our time-tested filters, this Boomstar Modular

AMP module, a gorgeous all-in-one discrete VCA charmer, is hand-built entirely in the U. S. of A—just ask Rachael Herbison!

Potentiometer Potential

Two attenuverter, and two attenuation pots control the INPUT, ST1 CV2 (CV), ST2 CV2 (CV), and OUTPUT.

Switch It Up

Uber-useful continuous hypnotic DRONE for endless sustain/release, and DRIVE—the overdrive circuit from the Boomstar desktop—for

last stage push, clipping, good ol' dirty vintage fuzz fun, and tone-crushed distortion.!