[sdiy] Guitar Synth boards ready...

[Scott Gravenhorst]

Very interesting, Mr. Bissell.  

On octave hop, I had an issue with that on my Roland GR-50.  One thing I
noticed is that the synth was better at tracking the higher strings and
responded to them with much less delay, so I thought I would replace
strings 5 and 6 with strings that are half the normal diameter and tune
them up an octave.  This worked like a charm, because the tuning is
essentially the same, so standard fingerings still work.  In the synth
module, there is a separate setup for each string, so it was easy to
cause strings 5 and 6 to output an octave lower than the string is
actually producing.  This results in a synth sound that is octave correct
and fast enough to be useful.  And when the standard pickups are mixed in
with the synth output, I get an almost 12 string effect.  I most often
use this with the synth set for a bass sound I designed.

harrybissell <harrybissell at prodigy.net> wrote:
>The PCB for my guitar P/V converter is ready. It is 6.6" x 12"
>and will fit in a 7" deep Sescom.com rack mount enclosure.
>
>It supports THREE strings using a hex pickup. I use the lowest three.
>
>It has
>
>P/V output
>Gate, enhanced Gate
>Envelope Follower w/ Lag
>Glide switch
>Footswitch Hold  (locks gate and P/V)
>Low note or Latest note priority
>Bass Audio Output (octave divider with a form of Lopass Gate)
>
>Requires a +/-15V power supply (not included on board).  You could use a
>Power One
>(or similar) or an Elpac Wall-wart style.   I don't know the current
>draw but its probably
>less than 200mA.   Two tempco resistors are needed (no, I don't sell
>them :^)
>
>You can bypass the string select logic and run a mono audio signal into
>the P/V converter...
>It works well for guitar over a two octave range... you can widen the
>range with the possibility
>of mistracking (octave hop) lower notes.  Might work with other audio
>sources as well ???
>
>Boards will cost (est)  $30 plus shippping
>
>Let me know soon if you are interested so I can order the correct
>number of PCBs.  There will not be a second order
>
>This is a fairly involved project with a four page schematic... 46 ICs.
>I will be writing a detailed circuit description, but don't try this if
>you
>are not familiar with, and have access to test equipment (Scope, stable
>waveform generator (a good VCO is OK)...  source of 1V/octave (good
>CV keyboard is OK).
>
>This is a public service announcement   ;^P
>
>H^) harry
>
>
>

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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