New CEM3340 :)

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jurekprzezdziecki
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New CEM3340 :)

Post by jurekprzezdziecki » Mon Nov 07, 2016 7:10 am

Just got the chips! Any suggestions for a good start? I thought about SH101 VCO clone maybe?

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ashleym
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Post by ashleym » Mon Nov 07, 2016 7:57 am

Exciting times ahead.

Do a bit more than the SH101 VCO. Use all the outputs and syncs at least. Remind yourself where the chips were originally used and take inspiration from the exotic ones like the Spirit

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vtl5c3
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Post by vtl5c3 » Mon Nov 07, 2016 12:08 pm

Perhaps Juergen Haible's dual VCO:

http://jhaible.com/legacy/tonline_stuff/hj2vco.gif

Does through zero FM.

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Post by abelovesfun » Mon Nov 07, 2016 12:17 pm

My apologies if this has been posted before - how does one go about ordering the ICs? I read the post for a Curtis VCO group buy and it seemed very confusing and expensive.
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Post by qfactor » Mon Nov 07, 2016 6:09 pm

Here is Susan's contact on the chips. They sell at US$15 per chip.
susanonchip@covad.net

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Post by metel909 » Mon Nov 07, 2016 7:11 pm

qfactor wrote:Here is Susan's contact on the chips. They sell at US$15 per chip.
susanonchip@covad.net

thank you!!!

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Fernando
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Post by Fernando » Mon Nov 07, 2016 7:28 pm

I have the magazine article (Digisound-80, ETI 1980?) with an excellent CEM3340 VCO schematics (and some 3340 too) It is maybe the most complete VCO I've seen.
(some mention about the Digisound-80 VCO here: viewtopic.php?t=143298&sid=81846754393b ... f9db6f4621 )

I will not be able to find it "fast" but I will "soon" (I'm resurrecting my synth project after a 5 years or so pause)
I will scan the article (I hope is in good shape still!) as soon as I bring all home
Last edited by Fernando on Mon Nov 07, 2016 7:40 pm, edited 1 time in total.
.

Fer

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Post by Fernando » Mon Nov 07, 2016 7:39 pm

.

Fer

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xbted
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Post by xbted » Tue Nov 08, 2016 10:10 am

I erased my post, it was just kinda mean sounding. I'm not mean.
Last edited by xbted on Tue Nov 08, 2016 7:59 pm, edited 1 time in total.
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jurekprzezdziecki
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Post by jurekprzezdziecki » Tue Nov 08, 2016 10:31 am

vtl5c3 wrote:Perhaps Juergen Haible's dual VCO:

http://jhaible.com/legacy/tonline_stuff/hj2vco.gif

Does through zero FM.
that's very cool! thanks for that.
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Post by jurekprzezdziecki » Tue Nov 08, 2016 10:49 am

abelovesfun wrote:My apologies if this has been posted before - how does one go about ordering the ICs? I read the post for a Curtis VCO group buy and it seemed very confusing and expensive.
send email to suzan, pay for chips, get the parcel fast - simple as that:)
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xbted
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Post by xbted » Tue Nov 08, 2016 11:21 am

jurekprzezdziecki wrote:
abelovesfun wrote:My apologies if this has been posted before - how does one go about ordering the ICs? I read the post for a Curtis VCO group buy and it seemed very confusing and expensive.
send email to suzan, pay for chips, get the parcel fast - simple as that:)
Yep, simple as paying for chips, 35 dollars for shipping, plus paypal, plus customs, plus VAT, get it fast... so simple. However, write Susan, not Suzan.
I like pie.

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Post by jurekprzezdziecki » Tue Nov 08, 2016 4:30 pm

xbted wrote:
jurekprzezdziecki wrote:
abelovesfun wrote:My apologies if this has been posted before - how does one go about ordering the ICs? I read the post for a Curtis VCO group buy and it seemed very confusing and expensive.
send email to suzan, pay for chips, get the parcel fast - simple as that:)
Yep, simple as paying for chips, 35 dollars for shipping, plus paypal, plus customs, plus VAT, get it fast... so simple. However, write Susan, not Suzan.
money is just a paper touched by million dirty hands...
soundcloud.com/jprzezdziecki

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Post by Datasette » Tue Nov 08, 2016 5:04 pm

Fernando wrote:I have the magazine article (Digisound-80, ETI 1980?) with an excellent CEM3340 VCO schematics (and some 3340 too) It is maybe the most complete VCO I've seen.
(some mention about the Digisound-80 VCO here: viewtopic.php?t=143298&sid=81846754393b ... f9db6f4621 )

I will not be able to find it "fast" but I will "soon" (I'm resurrecting my synth project after a 5 years or so pause)
I will scan the article (I hope is in good shape still!) as soon as I bring all home
My VCO is free and mostly based on that Schematics and the Datasheet, which are astoninglishly similar. Just have to wait for rev2 boards and hope they are working.

Further there are excellent projects from Timo and NLC , both completly SMD.

That are all I am aware of, so plenty to choose. I think there are maybe even more.

Also a member called Sanders has a thread with Digisound Low Part PCBs.

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Post by xbted » Wed Nov 09, 2016 3:25 am

jurekprzezdziecki wrote:
xbted wrote:
jurekprzezdziecki wrote:
abelovesfun wrote:My apologies if this has been posted before - how does one go about ordering the ICs? I read the post for a Curtis VCO group buy and it seemed very confusing and expensive.
send email to suzan, pay for chips, get the parcel fast - simple as that:)
Yep, simple as paying for chips, 35 dollars for shipping, plus paypal, plus customs, plus VAT, get it fast... so simple. However, write Susan, not Suzan.
money is just a paper touched by million dirty hands...
You, sir, are absolutely correct! Nothing in life is certain but death, taxes and paypal fees.
I like pie.

jurekprzezdziecki
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Post by jurekprzezdziecki » Wed Nov 09, 2016 4:49 am

xbted wrote:
jurekprzezdziecki wrote:
xbted wrote:
jurekprzezdziecki wrote:
abelovesfun wrote:My apologies if this has been posted before - how does one go about ordering the ICs? I read the post for a Curtis VCO group buy and it seemed very confusing and expensive.
send email to suzan, pay for chips, get the parcel fast - simple as that:)
Yep, simple as paying for chips, 35 dollars for shipping, plus paypal, plus customs, plus VAT, get it fast... so simple. However, write Susan, not Suzan.
money is just a paper touched by million dirty hands...
You, sir, are absolutely correct! Nothing in life is certain but death, taxes and paypal fees.
"You can't cheat death but you can cheat taxes" - Dalai Lama
soundcloud.com/jprzezdziecki

"Stop wearing Crocs!" - Doug Cl

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xbted
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Post by xbted » Wed Nov 09, 2016 11:16 am

This is what I got in the mail today, maybe you could try one out! It's from Non Linear Circuits!

Image[/img]
I like pie.

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Post by nvining » Wed Nov 09, 2016 8:21 pm

A project I've been considering: since the CEM3340 is back in production, and since the IT122 dual matched transistor pair is still available from LT, and since you could probably replace the VCAs with whatever you have lying around like a V2164, it would be A Lot Of Fun to do a Memorymoog voice. I don't know if you'd bust it into a module, or make it another exciting Polysynth Project like the guy who is doing the Jupiter 8 and Scott Rider's crowBX, but it'd be a fun project providing hours of gleeful entertainment and squinting at schematics for somebody with the right sort of twisted mindset.

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Post by andrewF » Wed Nov 09, 2016 9:34 pm

Fernando wrote:
I will not be able to find it "fast" but I will "soon" (I'm resurrecting my synth project after a 5 years or so pause)
Hi Fernando
long time no see!
:party:

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Post by jurekprzezdziecki » Thu Nov 24, 2016 4:54 am

xbted wrote:This is what I got in the mail today, maybe you could try one out! It's from Non Linear Circuits!

Image[/img]
this looks very cool. i will look on its site. thanks.
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Post by JenniferG » Tue Feb 21, 2017 12:31 am

qfactor wrote:Here is Susan's contact on the chips. They sell at US$15 per chip.
susanonchip@covad.net
Will she sell just one and ship it for like $5? I think their actual shipping cost for somethign this small should be like $2.50.

Or do they want you to buy like 10 at a time? I suppose I could sell off the extras on ebay or others here if that is the case.

Really intersted in the OpenCEM project.

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Post by andrewF » Tue Feb 21, 2017 12:39 am

I'm sure she will sell one.

As for shipping, my 1st batch of 10 to Australia was very cheap, can't remember exactly but about $15.
My 2nd order of 20 chips was $35 shipping.....I dunno :hmm:
Best is to ask her for cheap shipping and see what she offers.

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Post by TimoRozendal » Tue Feb 21, 2017 3:34 am

andrewF wrote:I'm sure she will sell one.

As for shipping, my 1st batch of 10 to Australia was very cheap, can't remember exactly but about $15.
My 2nd order of 20 chips was $35 shipping.....I dunno :hmm:
Best is to ask her for cheap shipping and see what she offers.
shipping has increased since some packages where lost
she won't do cheaper international shipping

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Post by JenniferG » Tue Feb 21, 2017 7:32 pm

If I wanted to learn the ins and outs of this IC, do I just read the old original data sheet or is there a newer data sheet for this re-release.

Did a quick search on Google and the only data sheets I see so far are scans of the old Curtis data sheets.

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Post by andrewF » Tue Feb 21, 2017 8:38 pm

JenniferG wrote:If I wanted to learn the ins and outs of this IC, do I just read the old original data sheet or is there a newer data sheet for this re-release.

Did a quick search on Google and the only data sheets I see so far are scans of the old Curtis data sheets.
Don't know of a newer datasheet
There is this Electronotes article by Thomas Henry

I used this datasheet, it covers most of the details.
Also one, again by Thomas, in Polyphony.
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