Each VCA has :

2 CV inputs with amount control

An Initial Gain Control

A Mute Switch (with bi-colour LED RED=MUTED / GREEN=ON)

A Large PAN control ( The LED on the PAN control indicates the signal at the INPUT)

The CV control also incorporates a useful buffering system.  If a CV is connected to the top channel's CVA input then this CV is electronically buffered to the remaining 5 channel's CVA inputs.  Likewise plugging a CV into the top channel's CVB input will result in a buffered copy being sent to the other 5 channels CVB input.  This way you can control all channel with 1 CV line.

Each channel can have its own CVA and CVB controls as plugging in to channels 2- 6 CV inputs will override the buffered inputs.

Also included in the design is a Stereo LED OUTPUT indicator (LED driver chip could be removed if your Current Draw is on a budget)

The basic idea for this mixer was to utilise the THAT 2162 2x Blackmer VCA IC's ( similar to that used in the SSL bus compressor) to control Volume and Pan for a single channel.  The output from the Blackmer VCA's are a Current source thus ideal for hi-quality stereo mixing.

It had to be on a single PCB to keep the costs manageable.  To achieve this a 4 layer PCB construction was used.  

Soldering of the SMT was done in a reflow oven whilst sockets an pots are hand soldered.

Specifications:

Width 45HP (228mm)

Height 128.5mm

Depth (with the IDC power connected but without the extra cable relief) 30mm

Requires +/-12v to operate

Current Draw Approx 400ma

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