The Equinox is an overdrive with a 3-band tonestack, and it was among the first overdrive pedals to use this type of tone control, allowing for more amp-like toneshaping via bass, midrange and treble knobs. Because of this, you can get a very wide range of tones out of it and it is suitable for many different styles of playing.
The dimensions of this pcb are 49,5mm x 49,5mm. It is also available as ready to solder kit:
This project is by Aion Electronics. Since the modifications featured in this project require some basic knowledge, this project is rather for more experienced builders.
Here is the direct link to the manual with layout and schematic:
Here you can find build reports on this project: Build Reports