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Posts by MisterX

Won't make a difference.   Does your build have bass boost? If not you need to install jumpers across the Sbbr and Sbbl pads or it's not going to make any sound.
Yes. First as a discreet buffer solution for the SOHA amplifier then as a stand alone "buffer", then as a stand alone "buffer" with volume control and finally as a headphone amplifier (with voltage gain).It's not bad for such a simple circuit and it's rather easy to change the gain if needed.
It may be better that you take a look at the published information. Especially if you're considering changing the gain.     http://www.amb.org/audio/beta22/
What are the color codes or number codes on the R3 and R4 resistors?
http://www.amb.org/audio/alpha20/
Have you read the tutorial that goes with the schematic?   http://tangentsoft.net/audio/cmoy/    
Yeah, the taper on step bits doesn't mean much on thin stuff and they suck for thick stuff. Works better then a hole saw though.   IIRC I also ordered a standard screw type arbor from McMaster for those McMaster wheels. Will look around later and see if I can find it... The quick change deal is nice on those Dremel arbors but my last McMaster wheel has done a bunch of amp builds and is still going strong.
BTW, these wheels from McMaster kick the crap out of the "reinforced" Dremel branded cutting wheels.     http://www.mcmaster.com/#1257a31/=wru01l
I've scanned PCBs to make mounting hole templates a few times. More times then not I will just use the pcb and a square and a scribe (a small sharpie is usually not much help) .  
:)
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