This thing is great ! A bit expensive, but considering all the parts included and the labor involved, i think it's fair. And all these costly details : varnished woden base, bags and boxes for parts, wires soldered on the pots ...
Having two small breadboards instead of one bigger makes a lot of sense, it's easier to have two designs at different competion stages. I also like a lot the free availability of the instructions !
Too bad i already have (almost) everything in the kit, i would have ordered one on the spot. But i will recommend it to some DIY-wannabee friends of mine ...
A couple of suggestions to make it even better :
- some bracket to mount pots and switches, a bit like that :
http://www.geofex.com/FX_images/protofx6.gif It's a lot easier to tweak a pot when you don't need the other hand to hold it ... so you can strum (or tap) at the same time.
- the most common pots and switches could be readily mounted in the breakout box (for example two SPDT, at least a 100k log volume, maybe also a 100k lin tone and a 500k log gain), if anything else is needed you mount it on the aforementionned bracket.
- for me, the voltage sag pot is cool but not essential. Better to have an easy way to wire it when you want.
- some sort of removable cover to protect the breadboard area, ideally clear plastic or acrylic. Does not need to be tough, it's not intended to gig with, but some protection can be useful when enthousiast testing happens (after all there is a stomp switch nearby), or just as dust cover for long-term iterative optimization of a design

- a ground plug for the multimeter, again only one hand needed to take basic measurements. Or include a crocodile clip and a post to grip it.
- Is there a permanent connection of the power lines on the breadboards ? If no, a good idea would be to wire VCC, VCC/2, GND. The last one kept available for specific bias. And basic power supply filtering in the breakout box.
Hmm, time for a contest "Best Tweaks of the Beavis Board"

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