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 Forum index » DIY Hardware and Software
Moog or SSM filters for my Juno 106: worth trying?
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kb



Joined: Sep 23, 2006
Posts: 5
Location: USA

PostPosted: Thu Aug 27, 2009 6:58 pm    Post subject: very inspiring! Reply with quote  Mark this post and the followings unread

I just ebay'ed some ba6110's right now after reading this! can we get someone on the forum to work on a pcb for this? Wink

since my hs-60 is now a lab of sorts (for those acetone-80017a experiments on Youtube), I think I'll try this maybe with the pile of cem3328's I have sitting around from a dead Mirage (might be not as nice sounding, though)



I did something similar (though a different kind of Frankensteining) on a SixTrak:

http://www.flickr.com/photos/37595587@N00/sets/72157616967698662/

It was a lot of work. I should post sound samples sometime soon...
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Mooger5



Joined: May 02, 2007
Posts: 197
Location: Portugal
Audio files: 8

PostPosted: Fri Aug 28, 2009 4:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey I´ve seen your work before. That was a major achievement. Congrats Very Happy
Please post some soundfiles. The DW-6000 was my first serious synth and I remember the filters sounding very, very nice. I think they were modelled after the SSM2044!

I haven´t heard the CEM3328, but it´s likely it´ll sound closer to the IR3109 than the SSM2044. And it has a built-in buffer so there will be one opamp less for you to be concerned with.

And a PCB would be great for this project, I definitely agree Cool

Regards.

Edit (3-11-09) - I meant the NJM2069AD was modelled after the SSM2040, not the 2044, sorry for the typo...
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Mooger5



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PostPosted: Thu Sep 03, 2009 2:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

To the moderators: I got two Topic Reply Notifications since my last post. But there aren´t obviously new replies Confused No complains here, just letting you know Smile
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Blue Hell
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PostPosted: Fri Sep 04, 2009 8:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Such can happen when something was actually posted but deleted later, for instance when someone posted a spam message that got deleted, or someone changing their mind ... not sure what happened here though.
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Mooger5



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PostPosted: Fri Sep 04, 2009 9:43 am    Post subject: Reply with quote  Mark this post and the followings unread

I see. Alright, thank you. Smile
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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Mon Sep 07, 2009 11:16 am    Post subject: Reply with quote  Mark this post and the followings unread

when I'll make 6 new ssm boards... what should I do after placing em in synth? what calibrations should be made?
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Mooger5



Joined: May 02, 2007
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PostPosted: Sat Sep 12, 2009 5:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Download the 106 Service Manual and follow the instructions.
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kb



Joined: Sep 23, 2006
Posts: 5
Location: USA

PostPosted: Tue Sep 15, 2009 2:30 pm    Post subject: do you have the CV ranges for the Juno-106? Reply with quote  Mark this post and the followings unread

hi mooger5,

in your work, I'm guessing you measured the full CV ranges for cutoff, resonance, and VCA that go to the 80017a "slot"

could you possibly post those? I can measure them in my Juno, but if you've got them handy, that'd be great.

thanks!
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Mooger5



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PostPosted: Wed Sep 16, 2009 4:07 am    Post subject: Reply with quote  Mark this post and the followings unread

I measured the CVs in the beginning but didn´t save the notes. I remember I got good DC readings for cutoff. At pin 2 of the slot, for resonance, I got very slight variations, in the order of 0.5 volts. The change was probably in current, but then I noticed there is already a transistor inside the 2044, so I removed TR18 from the voiceboard and it worked. I didn´t bother with the amount of voltage going to the filter chip because there are trimmers for that in the voiceboard. You should get good DC readings at the emitter of TR18. For the VCA control at pin 11 it´s the same thing (except the transistor is not to be removed as any OTA will need it).
I´m on vacations until the end of the week but I will redo the readings when I return home.
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Ricoche



Joined: Dec 19, 2009
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PostPosted: Sat Dec 19, 2009 6:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Mooger5 wrote:

It´s also convenient to mount IC sockets like the one in the picture. It´s 11 pins but as there´s a gap in the voiceboard between pin 1 and pin 2, I cut each socket to measure 12 pins and brake the second pin with plyers so the sockets fit perfectly. Then I seal the unused hole with solder to prevent wiring mistakes.
Posted Image, might have been reduced in size. Click Image to view fullscreen.


Can anyone recommend a place online to find mount IC sockets like the one pictured above? Much appreciated. Thanks!

Jim
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sun Jan 24, 2010 11:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi all:
I finally did the acetone bath to some 80017a.
I took the coat away of 3 chips using acetone and 2 of them worked OK.
The third one, worked too, but not quite right, the VCA worked, but the VCF
behaves strange, the resonance have little effect and the cuttoff have a non
linear response (very weird).
Anyway 2 of 3 is a good number.
Now I have 5 coated working voices in my Juno, and 2 uncoated working
voice for a total of 7, this left me with a spare voice. I will start to decoat
the working voices one by one to prevent them from failing in the future, and if
something goes wrong I will stop decoating and still having 6 working voices.

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Sebo



Joined: Apr 27, 2007
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PostPosted: Mon Jan 25, 2010 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Just to be clear, the 3 voices I peeled off, were non working before the process.
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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Tue Jan 15, 2013 10:58 am    Post subject: Reply with quote  Mark this post and the followings unread

can somebody check if it's ok?

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.
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valvusmusicus



Joined: Nov 06, 2009
Posts: 56
Location: Bournemouth. UK

PostPosted: Sat Feb 02, 2013 5:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just wondered if anyone has produced an 80017A replacement board using the 3080/SSM2044/roland chip replcement
Willing to board up aload as have facilities at work-and get involved in test/design-my MKS30 and Juno 106 both need replacement-and dont want to drop 40 plus Euros per chip-rather design something new, using readily available components!
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Mooger5



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PostPosted: Mon Feb 18, 2013 3:01 am    Post subject: Reply with quote  Mark this post and the followings unread

[quote="radek tymecki"]can somebody check if it's ok?
Looks very neat! I´ll check the circuit later.
Before making the PCBs, try to arrange the components on a perf board with the same dimensions just to check for clearance in the voiceboard. Some electrolytics sit very close to where the 80017As were.

I was a bit concerned about heat dissipation, as the SSM chips get a little warm. But then so did the 80017As.
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Mooger5



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PostPosted: Mon Feb 18, 2013 4:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Radeck, there are some errors in your layouts.
SSM pin 2 should go to voiceboard pin 2.
Output of opamp should go to voiceboard pin 3.
I´ll check the rest later.

Edit - OK, sorry. I now see what´s going. The blank space in the voiceboard is counted as pin 2. I´ll check later in the evening.
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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Mon Feb 18, 2013 5:43 am    Post subject: Reply with quote  Mark this post and the followings unread

yes you must be careful with pins coz empty one has also a number [2]
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Mooger5



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PostPosted: Mon Feb 18, 2013 6:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Absolutely. Well I just checked your layout and everything seems ok!
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radek tymecki



Joined: Mar 22, 2009
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PostPosted: Mon Feb 18, 2013 10:32 am    Post subject: Reply with quote  Mark this post and the followings unread

great!

i'll make proto run and then with your help i'll calibrate ju106!

if anyone will be interested i'll provide pcb projects Smile
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Mooger5



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PostPosted: Tue Feb 19, 2013 8:26 am    Post subject: Reply with quote  Mark this post and the followings unread

radek tymecki wrote:
great!

i'll make proto run and then with your help i'll calibrate ju106!

if anyone will be interested i'll provide pcb projects Smile


Although I have not much time for DIY tronics anymore, I´m definitely interested!

I´d even buy six PCBs to populate in a hopefully non distant future, home-made or manufactured.

On about calibration, finding the optimal high resonance amount is the trickiest part. Excessive self-oscillation will make the filter go wild and won´t track the kbd. For the rest of the procedure it´s just like with the 80017A, if not easier. The BA6110 is the best.
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