Add polarity switch to B.Blender PCB

[skills4life]

Hi all,

First off thanks to this board and members for great information and learning.

I am interested in adding a polarity switch to Sean M's B.Blender circuit.  His polarity switch modded schematic can be found here: ftp://ftp.seanm.ca/stomp/bblender-mod.gif  with the switch just after OPc, before the return.  How do I translate this switching mod into the PCB layout I drew up using  DIY layout creator?  Here's the image of the standard circuit for PCB:  http://aronnelson.com/gallery/v/BBlenderDIY.gif.html but I am still uncertain how to modify the actual PCB layout.

In addition, I was reading the discussion here: http://www.diystompboxes.com/smfforum/index.php?topic=33451.20 on the Keeley Parallel Mixer where gaussmarkov noticed RK puts the phase inversion before the send (unlike SeanM's schematic).  SeanM replied RK's inverter switch may be a simpler.  Should I go for placing the polarity switch before the send? How would I modify the PCB design?  Where would I add solder pads and cut the trace on the PCB layout?

Lastly, what type of switch should be used for the polarity switch?  A SPT on-off switch will do the trick? 

I'm fairly new to this arena of mods, and not too experienced with translating schematics into actual PCB layouts, so I thought this might be a good learning experience.

Thanks for any help.

Larry

[skills4life]

Any takers?   Thanks in advance for anyone willing to help out.

Larry

[skills4life]

This is an updated link to the PCB layout.  It is labeled for easier reading as well as a fix for the C1 tracing which was not correct.

http://aronnelson.com/gallery/v/BBlenderDIY_001.gif.html

Thanks again,

Larry