B16 Compressor Rev 2.1
Designed around the THAT 4305 dynamics processor IC, the B16 is a fairly easy to build and
use compressor that is useful in a wide variety of applications. The low distortion VCA, Burr-
Brown op-amps, and state of the art line driver and receiver ICs combine to form a transparent
circuit that keeps levels under control while adding a minimal sonic imprint. An optional
transformer allows for a true floating output and some transformer color, if desired. Attack and
release timing is generated by a program dependent non-linear capacitor circuit that eliminates
the need for separate attack and release controls.
Who Should Build This Kit?
The B16 is not difficult to build, well, other than the 4305
IC…but it also is not intended for
absolute beginners. The soldering on the 4305 IC can be done by SCA for an additional
charge! You should have built at least one project on a printed circuit board (PCB) before trying
the B16. Sorry, but soldering cables doesn’t count. If you’ve never built an electronic project
of any kind, this is probably not the one to start with. To guarantee success make sure you
have:
• The ability to make basic voltage and resistance measurements using a digital multi-
meter (DMM).
• At least a rudimentary understanding of Ohm’s Law and the relationship between
voltage, current, and resistance.
• Some experience soldering on printed circuit boards.
• The patience to follow instructions precisely and work carefully.
Essential Tools
Fine tipped 20-30 Watt soldering iron w/ cleaning sponge (Hakko 936 or similar)
Eutectic (63/37) rosin core or “no clean” solder (.025” diameter is usually best)
Good-quality DMM
Small needle nose pliers
Small diagonal cutters
Phillips screwdriver (#1)
Flat jeweler
’s screwdriver
Highly Recommended Tools
Lead bender (Mouser 5166-801)
Magnifying glass
To adjust makeup gain
, you’ll need the ability to generate and measure audio test signals
between
–20dBu and +20dBu. Most DAWs can accomplish this task.
