|Power supply inside|
Moreover, Korg uses a slightly different connector than most 9V guitar pedals power supplies and the polarity is reversed (positive inside). They correspond to the EIAJ-02 japanese standard. Size is 4.0 x 1.7mm.
|Power plug assembly in progress|
There are some solutions out there, like alternative power supplies, adapters, daisy chain cables, etc. Nevertheless, I couldn't resist to make my own power supply.
|Bob screws the cables|
The transformer is a 220V to 2x 12V transformer. Bridge rectifiers are DB205. Regulators are LM317. The power plugs are PP-014 from CUI. The enclosure is a 137x97x67mm ABS Polycarbonate Power Supply Case.
Each one of the two outputs of the power supply is split in two with splices and a bit of heat shrink tube.
The transformer is only rated for 12 VA, which means 500 mA per output. Volca are reported to draw about 80mA. This means a total of 160 mA per output. That's enough safety margin for me.
That's it. Let the fun begins.
|Circuit and layout|