Variable Mutual Conductance Compressor

Schematics Specs Boards Wiring Testing BOM

Schematics

Main Board shyster
Sidechain shyster
Meter Driver shyster
Power Supply shyster

Specifications

RightMark Audio Analyzer test report

Specifications and Calibration Instructions
Compression Curves and THD @ 1kHz shyster

Boards

Before populating the boards use main board, PS board and meter board to mark mounting holes to the chassis.

Mount the tube sockets with standoffs before soldering.

Main Board shyster
Sidechain shyster
Sidechain shyster
PS and Meter board shyster

Wiring

Assembly and Wiring

Use plastic standoffs under PS board.

Layout shyster
Assembly pic 1 shyster

Mount the sidechain board to front panel.

Don't use super bright LEDs on the sidechain! Use LEDs with luminous intensity of 300 mcd or less.

Front 1 shyster
Front 2 shyster

Use heatsinks or mount regulators U1 and U2 on DC-DC PS board to chassis!

Finished 1 shyster
Finished 2 shyster

Testing

Layout with voltages

Voltages shyster

Check the calibration instructions here.

Bill of Materials

Main Board BOM.

Sidechain BOM.

Meter driver BOM.

DC-DC Power Supply BOM.

Front Panel

Front Panel Designer file


Heikki Vuojolahti

www.ghr.fi