Here's a collection of vero (stripboard) and tagboard guitar and bass effect layouts that we have put together covering many classic and popular effects in growing numbers. Many of these have been posted on freestompboxes.org, so check that site out for great discussions on building your own effect pedals. Enjoy the builds and please also visit us on Facebook and Twitter
This should be a useful little circuit for a few people and will allow you to match JFETs VGS (or more precisely, the voltage at which RDS is 10K) when required in some phasers etc. Based on the information posted by RG here which should explain how everything works.
Compact version with onboard sockets suitable for both DSG and DGS JFETs.
This version with separately mounted sockets for JFETs.