Here's Way Huge's take on the Ross Compressor. This is based on an original from the mid 90s that was traced over on FSB. It will fit in a 1590B with side mounted jacks or a 125B with top mounted jacks.
This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.