128 steps unbalanced stereo volume control kit w/ highly reliable relays !!

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This is our popular audiophile quality 128 steps volume control board. It is now released as a half-completed kit.

The kit features :

1. high quality PCB with SMD components already soldered on the board ;

2. Dale non-magnetic resistors as the only resistors on the audio path ;

3. Can be retro-fitted with IR remote motorized potentiometer to become a remote stepped volume control board.


Input Impedance : Between 200K to 3K

Output Impedance : 3K to 200K
(Note : This is a R2R type attenuator. Therefore the input and output impedance varies with position)
Board Dimension : 80mm x 50mm.


Supply voltage : AC 12V to 15V or DC +15V to +18V
Each board come with a 50K potentiometer to control a DC level for specific relay setting. Audio signal does not pass through the 50K potentiometer. It is for control purpose only.
This is a kit that requires soldering. The SMD parts are already presoldered on the board.
The assembled board in the picture is for reference.
We provide schematic and part list to buyers.