The Eclipse Preamp project is a pedal conversion of the preamp section of the Korg SDD-3000 digital delay rack unit. This project has options for either +/-9V or +/-15V internal power. The 9V will sound fine, 15V maybe better.
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