DIY JPTR 8 clone *** New VCO Core Picture ***

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Boogie
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Post by Boogie » Sun Apr 14, 2019 8:19 am

Hello all,

An in between update.

Before finishing the new voice boards I have been working on some low power VCO saw cores.
These cores will have a lesser power consumption of at least 100 mW @ 30V compared to the original schematic. (and thus less self heating)
All this without sacrificing the purity of the SAW as original designed.
It took a while to select the right components, and it's been a lot of work to get there.
I used some spare boards of the previous version of the Voice Board to experiment, though now it's time to try them on their appropriate PCB for evaluation. Screen dump below.
Once this is done, I finish the new version of the Voice Boards.

Next step is the DAC board to hold the Voice Boards and the processor board.
Though that last one may get implemented on the DAC board.

Planning wise,
well, end of june doesn't seem realistic anymore.
I'll keep you updated along the road.

All the best to you all.

Image
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Eric the Red
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Post by Eric the Red » Sun Apr 14, 2019 8:44 am

End of June, end of July, end of August... I don’t think it matters to us.keep up the good work.
Abandon all hope, ye who wiggle.

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Boogie
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Post by Boogie » Sat Apr 27, 2019 9:43 am

Hello all,
short update about the low power VCO I've been working on.

I forgot to order 1 chip , so I populated it with an SO8 (placed vertical and some small wires) instead of a VSSOP8.
Fully functional, but not so nice to show pictures yet.
That'll be for 2nd half next week when the part arrives.

This new design of my Saw-core VCO remains its linearity and has
improved long term stability.

One another for the total power of only: 202 mW. @ plus and minus 12V.

I'm considering to make this a DIP 28-like plug on module.
Would be usable for those willing to make their own VCO or whatever.

In case of sufficient interest I'll start a separate thread for it.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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tobb
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Post by tobb » Sat Apr 27, 2019 10:58 am

Boogie wrote:Hello all,

I'm considering to make this a DIP 28-like plug on module.
Would be usable for those willing to make their own VCO or whatever.

In case of sufficient interest I'll start a separate thread for it.
That would be cool,should be +/-15v compatible then to. (so it can be used for other formats like 5U,4U)

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synthetic
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Post by synthetic » Sat Apr 27, 2019 12:57 pm

I am interested in the populated SMD version. The samples sound incredible. I haven't heard a polysynth sound this good in decades. Tremendous, legendary work.

It is probably too late, but if the case could be 17" wide instead of over 19", we could attach ears for rack mounting. And I like the jellybean colored buttons, that's a big part of the experience for me.

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Boogie
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Post by Boogie » Sun Apr 28, 2019 2:52 am

tobb
That would be cool,should be +/-15v compatible then to.
All frequency influencing circuits are supplied by local stabilized references and all opamps can handle more than +/- 15V.
I did that as an oscillator should not depend on the stability of its supply which I see is unfortunately happening quite a lot in modular designs.
This oscillator is foreseen and functional to work on both +/-12V and +/- 15V without any jumpers.

synthetic
I am interested in the populated SMD version
I'll add you to the list.
The samples sound incredible. I haven't heard a polysynth sound this good in decades. Tremendous, legendary work.
Thank you !
It is probably too late, but if the case could be 17" wide instead of over 19", we could attach ears for rack mounting
I've been considering that initially, but there are so many controls that in order to keep them well accessible during live performances, I had to space them at a realistic distance.
As well as by now, the control panel lay-out is quite final as well.
Thanks for the input but no 19" version for now. Though the sound expanders, discussed earlier in this forum, will probably fit into a 19" 3U rack.
About the knobs, one may always remove the assembled ones and replace them by their own preference. Otherwise, it would make me end up with dozens of different knobs.
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Boogie
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Post by Boogie » Sun Apr 28, 2019 9:05 am

Low Power VCO core
The screen dump below shows a tuning analysis over 8 octaves.
The B7 indicates +100 cent which is C8 +/- 0 cent.

Initial tuning of C4 after 20 sec was +9 cents.
Below a sceen dump after a warm up of 10 minutes. (after all, it's analog...)

Image
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Starspawn
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Post by Starspawn » Sun Apr 28, 2019 1:10 pm

Id love a simple saw core to use with fritz waveshapers and things.

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synthetic
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Post by synthetic » Sun Apr 28, 2019 7:51 pm

Understood about the layout. This seems very far along and I just discovered it last week. Also I already have a Super Jupiter & Programmer so the rack thing is covered. ;)

Use some orange paint on the front panel if you can afford it. :)

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Boogie
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Post by Boogie » Wed May 01, 2019 9:38 am

Hello all,

Picture of Low voltage VCO below.

Soldering is less good, but was for evaluation only (prototyping)
As I've put quite some time into optimizing and component selection,
I prefer not to disclose the used IC's yet.
Thank you for understanding.

Image
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Boogie
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Post by Boogie » Wed May 01, 2019 9:45 am

Image
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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ultravox
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Post by ultravox » Wed May 01, 2019 10:29 am

Boogie wrote:Hello all,

Picture of Low voltage VCO below.

Soldering is less good, but was for evaluation only (prototyping)
As I've put quite some time into optimizing and component selection,
I prefer not to disclose the used IC's yet.
Thank you for understanding.
Nice going and no problem about using discretion with your prototypes. It's your design and to quote from War of the Worlds: "..intellects vast and cool and unsympathetic, regarded this earth with envious eyes, and slowly and surely drew their plans against us".

As such, I'm waiting for the big reveal later this summer / autumn! :tu:
This means nothing to me... Oh, Vienna!

lukexi
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Post by lukexi » Mon May 13, 2019 1:56 pm

Hi Boogie, I'd be in for an unpopulated SMD!

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jbdiver
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Post by jbdiver » Sat May 25, 2019 8:30 pm

Please add me to the SMD list.

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Boogie
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Post by Boogie » Mon May 27, 2019 1:18 pm

Image
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

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Now and Zen
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Post by Now and Zen » Mon May 27, 2019 4:05 pm

Hi Boogie,

I'd like a set of populated SMD boards please...
Adding vintage DNA to Eurorack
www.ajhsynth.com

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Boogie
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Post by Boogie » Mon Jun 03, 2019 3:16 pm

Image
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

vicpop
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Post by vicpop » Mon Jun 17, 2019 9:25 pm

Please put me on the SMD list

groove
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Post by groove » Tue Jul 30, 2019 8:50 pm

Hi Boogie,

Is this project still live?

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devinw1
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Post by devinw1 » Wed Jul 31, 2019 11:22 am

I was just thinking of this the other day! Hope everything is all good Boogie!

Portabella
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Post by Portabella » Thu Aug 01, 2019 6:36 am

Fingers crossed :hail:

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Boogie
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Post by Boogie » Sat Aug 10, 2019 1:29 am

groove
devinw1
Portabella

Hello all,

I slowed down, yes.
It will arrive, though not on extreme short term.

I hope to be posting again in a couple weeks.

B rgds,
Boogie
-------------------------------------------------------
“Digital generated ‘analog’, is missing its analog soul and therefore isn’t analog any more.”
Jupiter 8 clone: https://www.muffwiggler.com/forum/viewt ... p?t=209322
Minipops 7 clone: https://www.muffwiggler.com/forum/viewt ... p?t=199360
ClapTrap clone: https://www.muffwiggler.com/forum/viewt ... p?t=202248
www.nabla-instruments.com

Panason
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Post by Panason » Tue Aug 27, 2019 10:42 am

Bump 'n' grind

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devinw1
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Post by devinw1 » Tue Aug 27, 2019 11:15 am

Right on, Boogie. Good to hear from you! :sb: :sb:

nicdro
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Post by nicdro » Sun Sep 08, 2019 1:06 am

nice project.
please put me down for smd
thanks!
edit: i suggest polyAT if it is possible :hail:

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