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<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial>Hi Tim and SDIY Team,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial>Tonight I finally finished the resonator board, but it's
useless without controls of course, so I have just laid out a 4" x 4" panel PCB
with all of the necessary panel components on it (16 pots, 4 DPDT On-On-On
switches, 2 SPDT On-On switches, and 6 jacks). I'll try to make that
tomorrow, but I have to buy some 10k pots, as I only have 100k on hand but
the resonance circuit needs 10k, so I'll probably have to wait until Monday
when I can make a trip to Lee's in Vancouver.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial>Concerning the ARP Soloist filters, I have an old and very
broken Soloist sitting under a cabinet in my living room collecting dust which I
acquired from Dave Leith. The main reason I wanted this beast was so I
could play with the filters, and this was entirely because I love the sounds
that Tony Banks obtained on those old Genesis records (Riding the Scree, Blood
on the Rooftops, etc). It was going to be a project for last year when I
was on sabbatical, but I never got around to it. I'm going to try to do
something with it in the next couple of months, though.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=836055407-14102018><FONT color=#0000ff
size=2 face=Arial>The ARP resonators are completely non-adjustable. They
are just fixed T-filters with different component values. There is a
resonator switching logic circuit (with NAND gates and NOT gates) which turns
these resonators off and on. The resonators take a pulse waveform in and
are arranged in parallel. The inverters of a 7405 (which have
open-collector outputs) are connected directly to the filters, and I
believe that they ground the signal when on to turn off the resonator, but when
off, they have little or no effect. That's how I interpret the
schematic, but it is 1:00 am and I'm not really familiar with 7405s, so I could
be misinterpreting it badly. It's probably some trick that every
"grey eminence" knows very well, but that I'd have to spend an hour or so trying
to understand.</FONT></SPAN><BR></DIV>
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<FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@synth-diy.org] <B>On Behalf Of </B>Tim
Parkhurst<BR><B>Sent:</B> Saturday, October 13, 2018 11:00 PM<BR><B>To:</B>
Tom Wiltshire<BR><B>Cc:</B> synth-diy@synth-diy.org DIY<BR><B>Subject:</B> Re:
[sdiy] Polymoog resonator question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr>Just a thought: skip the voltage control, put in digipots for the
panel controls, and make the whole thing programmable. Especially for use as a
resonator, it would be cool to dial in several acoustic instrument responses
and then be able to bring them up quickly. Okay, maybe keep voltage control of
the center frequency for nifty sweep sounds.
<DIV><SPAN class=836055407-14102018></SPAN><FONT color=#0000ff size=2
face=Arial> </FONT><BR></DIV>
<DIV>And while we're talking about resonators and the ARP 2700 (over on AH),
has anybody ever found schematics for, and successfully duplicated the fixed
filter / resonator section of the ARP Soloist and Pro Soloist? Seems like that
has a history of pretty useful acoustic instrument responses. Also, has anyone
ever run a poly synth through a Soloist resonator section? Also also, how does
the Soloist switch presets? Are there a bunch of relays or transistor circuits
in there switching different resistor and cap values around?</DIV>
<DIV><BR></DIV>
<DIV>Tim (on a questionable question quest) Servo</DIV>
<DIV>
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<DIV dir=ltr class=m_3983868467844303282gmail_signature
data-smartmail="gmail_signature">
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<DIV class=gmail_quote>
<DIV dir=ltr>On Fri, Oct 12, 2018 at 1:52 AM Tom Wiltshire <<A
href="mailto:tom@electricdruid.net"
target=_blank>tom@electricdruid.net</A>> wrote:<BR></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote><BR>> On 11 Oct 2018, at 18:31, Rutger Vlek <<A
href="mailto:rutgervlek@gmail.com"
target=_blank>rutgervlek@gmail.com</A>> wrote:<BR>> <BR>> That
video is also my sole reason for wanting a resonator. I'd actually hope for
the resonator to also be able to track keyboard moderately well to
(optionally) maintain a fixed interval between notes played and resonant
frequencies.<BR><BR>That’s possibly useful, but missing the point of a
resonator, I’d say. The idea is that we’re modelling the resonances of a
instrument body in some way, and those are fixed for a given instrument.
That’s a key part of what gives one instrument a different character from
another.<BR><BR>> My suspicion is that Elhardt identified a very small
number of sweet spots that are very well tuned to the input signal as well
as to the reverb on top. I believe it's only partly thanks to the resonator,
but also thanks to his craftsmanship (or many hours of exploration) that he
can make it sound this good.<BR><BR>Certainly his playing is a big part of
the success of that video. He takes a “trumpet-like” sound, but then does a
very good job of playing it like a trumpet. If you’d done the “Jump” chords
(for example) instead, it wouldn’t have sounded half as
good.<BR><BR>Tom<BR>_______________________________________________<BR>Synth-diy
mailing list<BR><A href="mailto:Synth-diy@synth-diy.org"
target=_blank>Synth-diy@synth-diy.org</A><BR><A
href="http://synth-diy.org/mailman/listinfo/synth-diy" rel=noreferrer
target=_blank>http://synth-diy.org/mailman/listinfo/synth-diy</A><BR></BLOCKQUOTE></DIV></DIV></BLOCKQUOTE></BODY></HTML>