This is my take of the BSIAB with some tweaks inspired by similar builds (e.g. the Diablo Drive)
• Noiseless biasing (based on R.G. Keens recommendations)
• Internal trim pots for bass and presence to fine adjust sound to any amp (as seen on the Okko Diablo Drive)
• Contour mod (based on the General Guitar Gadgets BSIAB II)
• Switch for +9V/+18V operation (as seen on the Okko Diablo Drive)
• Minor changes in the input section and in the circuit as well
• Added a second pot for "lead boost", which simply increases volume (not gain)
• Provided some space for optional components for further mods
• +9V and GND pads on the switch side for relay switches/LEDs
Fits in a 1590BB, documentation is here: https://drive.google.com/open?id=1g8BagMpBAZGZ6NRCEpW4PXo3-MAYxbF_
Leftover sale: http://www.madbeanpedals.com/forum/index.php?topic=27408.msg265388#msg265388
For those who already downloaded the documenation: I updated the drill template, please download again and please always measure yourself before drilling!
The very special thing about this is the enclosure, which I won from forum member fair.child in the BOTY competition. Given the circuit, I wanted a classic EVH colour swirl, and it turned out just perfect! Thanks again for that, fair.child.
The circuit was a bit noisy outside the enclosure but turned much more quiet when I closed the lid (it still produces some noise, but totally acceptable - it's a mid- to hi-gain circuit with discrete components...)
The enclosure, like I receivded it:
(https://s6.postimg.org/uxivdgk81/IMG_20180225_123318.jpg)
Top view (left to right: Gain, Contour, Tone, Volume, Lead Volume, Switch: 9V/18V)
(https://s6.postimg.org/ttyr1l7bl/IMG_20180225_151714.jpg)
Rear view:
(https://s6.postimg.org/uw8xk4apd/IMG_20180225_151611.jpg)
Guts:
(https://s6.postimg.org/dvq1bg5dt/IMG_20180225_151744.jpg)
Any particular reason that you left out a couple of optional caps? What do they effect? Thanks.
Great stuff.
Quote from: SlaveUnit on February 25, 2018, 04:46:32 PM
Any particular reason that you left out a couple of optional caps? What do they effect? Thanks.
Yes... Low pass filter cap just before the output. I like bright aggressive sounds and don't mind a bit of noise...
Quote from: Marshall Arts on February 25, 2018, 04:56:46 PM
Quote from: SlaveUnit on February 25, 2018, 04:46:32 PM
Any particular reason that you left out a couple of optional caps? What do they effect? Thanks.
Yes... Low pass filter caps just before the output. I light bright aggressive sounds and don't mind a bit of noise...
Forgot: one is a boost cap on the second u-amp... But it has enough gain and volume without it, imho
Great. Thanks for the replies.
Could you please tell me which one does which? I'm thinking about throwing 1 on a switch.
Quote from: SlaveUnit on February 25, 2018, 05:06:49 PM
Great. Thanks for the replies.
Could you please tell me which one does which? I'm thinking about throwing 1 on a switch.
C13 and C14o filter hi frequencies, c9o is the boost cap. ,,o" stands for ,,optional"
Quote from: m-Kresol on February 25, 2018, 04:54:40 PM
Great stuff.
Great companion for a Spitfire Amp, m-kresol :-)
Beautiful, really beautiful build
Wow, that is a nicely done. It looks very EVH-ish 8) Did you happen to finish it again with Polyurethane? How was the drilling? It seems to turn really good looking there.
Quote from: fair.child on February 26, 2018, 06:14:51 AM
Wow, that is a nicely done. It looks very EVH-ish 8) Did you happen to finish it again with Polyurethane? How was the drilling? It seems to turn really good looking there.
I was scared to paint it again, I had colours dissolve dried layers before.... And it looked perfect the way it was... Drilling went well without any color chipping off..
I recorded something with the pedal today, if anybody is interested, there are boards left ;-). Please excuse the crappy playing, still practicing that thang...
...added some shielded cable yesterday - I can recommend that for any high-gain-pedal build!
(https://s6.postimg.cc/8ubdz4lw1/IMG_20180422_085624.jpg)
And finally, as I wanted to make this really look 80's style, I added some really old-school labels ;-)
(https://s6.postimg.cc/54vyu81r5/IMG_20180426_073701.jpg)