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April 10, 2014, 11:16:04 AM

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DIYstompboxes.com
|  DIY
Stompboxes  |  Building
your own stompbox  |  Finished
the Polyphase!!! Presenting The Resotron

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Topic: Finished the Polyphase!!! Presenting The Resotron
(Read 1591 times)

Morocotopo

Posts: 758

Ariel F. - Argentina

Finished

« on: June 16,
2013, 08:30:48 AM »

Hi all.

Finally finished
my Polyphase semi-clone. I christened it
"Resotron" because it has awesome resonant
sounds.

It all started here:

http://www.diystompboxes.com/smfforum/index.php?topic=100570.0

and
here:

http://www.diystompboxes.com/smfforum/index.php?topic=99403.0

and
here:

http://www.diystompboxes.com/smfforum/index.php?topic=102176.0

The
thing in action:

&lt;a
href="http://www.youtube.com/watch?v=OXL0z3bVJAE"
target="_blank"&gt;http://www.youtube.com/watch?v=OXL0z3bVJAE&lt;/a&gt;

Thanks
to all who helped with this build! Mark, Jimi,
Scruffie and many more. Later I´ll post the build
details, but couldn´t resist showing off... err,
showing it to you guys.

Logged

Morocotopo

Liquitone

Posts: 178

Kay

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #1 on:
June 16, 2013, 08:47:48 AM »

Nice! well done
I especially like the envelope
sound with the sweep rate still going, and I like
the lower feedback setting better then the high
feedback, it gets too gimmicky then.
But I
have that issue with all phasers and flangers.
(apart from the small stone maybe, I love the high
feedback setting on that one.)

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Liquitone Audio
Electronics

http://liquitone.blogspot.com/
http://www.facebook.com/LiquitoneAudioElectronics

deadastronaut

Posts: 8696

Rob H.
LONDON

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #2 on:
June 16, 2013, 08:51:08 AM »

very cool...i like the env
settings too...nice.

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http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index

''sickened
by my own existence'' DA
2013.

armdnrdy

Posts: 1789

Larry L.

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #3 on:
June 16, 2013, 10:44:07 AM »

Great job
Ariel!

Question:
Without reading through
all of the posts, Did you ever try a different
vactrol besides the CLM8200/2?

I'm
wondering if a VTL5C3/2 will work close enough. As
you know the CLMs are non existent.

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Morocotopo

Posts: 758

Ariel F. - Argentina

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #4 on:
June 16, 2013, 11:35:12 AM »

Thanks guys!

Armdndry,
no, I only have 8200/2´s, don´t have any other
dual optos.

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Morocotopo

kaycee

Posts:
191

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #5 on:
June 16, 2013, 12:52:54 PM »

That's really cool sounding and
looking, great work!

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Mark
Hammer

Posts:
21466

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #6 on:
June 16, 2013, 01:22:31 PM »

VERY very nice.  The time
constants on the envelope part are very
musical.  That is, the feel of the envelope
control is expressive, and doesn't fight the user
in any way.  The envelope-driven sweep of the
phaser, when there is no LFO modulation is also
quite lovely; almost filter-like but different. I
will note that the issue of Polyphase you cloned
has 6 stages of phase shift, where the current
issue unit only has 6 swept stages (can't tell if
there are any additional fixed stages).  I
really like the sound of the older POlyphase I
repaired last fall, and this unit lives up to the
sound of that one.  Kudos.

I adapted a
Phase 90 I made to have some envelope control,
although all I did was parallel an LDR with the
Rate/Speed control to have some envelope-control
of modulation rate.  Fans of the P90 will
note that the value of the 1M resistance between
the trimpot and the JFET gates can be altered to
adjust the "offset" of the phasing; that is the
frequency range where the notches are
produced.  Were one to parallel an LDR with
that resistance, it would be possible to produce
some of the auto-sweep sounds that the Resotron
produces, although not likely with as much
control.

If you can implement it, I also
recommend installing a dry-lift to get vibrato
effects.  I did that on my P90 and modulating
the speed of the vibrato by picking strength is
quite nice as well.

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Slade

Posts: 845

Fernando R. from Chile

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #7 on:
June 16, 2013, 04:42:30 PM »

That sounded
delicious!!!
Congrats. Really looking forward
to build one.

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http://ruzguitargear.blogspot.com/
RGG Facebook!
Tutorial - Making a Multicolor
Etching[/url

pinkjimiphoton

Posts: 4708

"it's got YOY" jimi
in manchvegas

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #8 on:
June 17, 2013, 01:14:01 PM »

ariel, that's freakin'
awesome.

i still can't seem to get this
polyphase running here. we need build docs man!!

Logged

i don't care what ohms law
is, i ain't no flippin
EE!!

Morocotopo

Posts: 758

Ariel F. - Argentina

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #9 on:
June 17, 2013, 06:26:07 PM »

OK, thanks guys.

Mark:
yes, the feel of the envelope is very musical,
doesn´t get too abrupt or feel hard to control.
Also, no ripple. About how it compares to a real
one, no idea, never heard one, but according to
you is similar. Good! The thing is really vocal,
for lack of a better word, very vowel-like sounds.
Why didn´t you tell me about the dry lift
before?  Eventually I´ll try it.

Jimi:
Get the one you have working! it´s a great
FX.

My final schem:

Later I´ll post the details
about my schem and the layout and PCB
files.

Logged

Morocotopo

Scruffie

Posts:
1918

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #10 on:
June 17, 2013, 06:55:11 PM »

Quote
from: armdnrdy on June 16, 2013, 10:44:07
AM

Great job
Ariel!

Question:
Without reading through
all of the posts, Did you ever try a different
vactrol besides the CLM8200/2?

I'm
wondering if a VTL5C3/2 will work close enough. As
you know the CLMs are non existent.

Specs are close enough for
jazz, i'm going to test several options soon when
madbean releases his PCB for this.

Great
job Morocotopo  sounds lovely! Can't wait for the
build report and obligotary guts

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StephenGiles

Posts:
5371

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #11 on:
June 26, 2013, 02:14:54 PM »

It also occurred to me that the
bounce circuit from the Eventide Instant Phaser
would make a useful modulation tool for this
unit.

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If you don't go when you do
want to go, then when you do go you'll find that
you've
gone.

Scruffie

Posts:
1918

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #12 on:
April 08, 2014, 11:18:18 AM »

Morocotopo, when you built yours
what voltage did you get at the trimmer? Only I
have an original in for repair and while the
envelope works, I can't set it to the 6.7V
specified on the original schematics, about 5V max
(at which point the envelope doesn't really work)
so i'm wondering if the thermistor is bad or if
the original schematics have that as a red
herring... although assuming they're wrong on
purpose and just for servicing purposes that seems
a little counter-intuitive.

Edit: Nevermind
i'm an idiot, it's 6.7V after the 8k2 not at the
trimmer

« Last
Edit: April 08, 2014, 01:24:44 PM by
Scruffie »

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jubal81

Posts: 106

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #13 on:
April 08, 2014, 01:04:19 PM »

Whoa, just remarkable!
Bravo.

Logged

roseblood11

Posts: 456

Re:
Finished the Polyphase!!! Presenting The
Resotron

« Reply #14 on:
April 08, 2014, 03:06:04 PM »

Quote
from: Morocotopo on June 17, 2013, 06:26:07
PM

Later I´ll post the details
about my schem and the layout and PCB
files.

still waiting...

Logged

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