6 WAY BUFFER PCB Could some of the layout pros take a glance please?

[ianmgull]

So in my quest for the ultimate parallel possessing setup, I'm trying to pack the requisite number of buffers on the smallest footprint possible. I used JD Sleeps layout from GGG as my starting point. This layout however uses 3 TL072s for 6 total buffers.

Am I correct in assuming that I can use the same pair of bias resistors, input cap, and pulldown resistor for all six op-amps as I have?

Does anyone foresee any problems with the position of my +9v rail?

Any other general suggestions to improve my layout?

As I stated, I'm going for small as possible (hence the standing resistors, close output caps) but since this is my first layout after reading RG's book I'm sure there is room for improvement.


GGG Schematic page:

http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=74&Itemid=26

[R.G.]

Don't know about that layout, but if you're really after small, use three eight-pin Single-In-Line dual opamps and a resistor SIP.

[ianmgull]

Thanks for the advice RG. I choose to use these components because that is what I have on hand at the moment. It's about 40mmx25mm so I should have stated that this size will suffice for my purposes.

When you say you don't know, is there something that stands out as poor design that I could improve on?

Thanks for the help, I greatly appreciate it.

[ianmgull]

Threw this in a parallel looper and it worked like a charm. I used 5 switchable loops for external effects and one internal to carry the clean signal. It's a tight squeeze but the I found some small electros that are less than 4mm in diameter.


Here is the verified transfer for those interested: