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 Forum index » DIY Hardware and Software
CV Quantizer PCB Layouts
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ericcoleridge



Joined: Jan 16, 2007
Posts: 885
Location: NYC

PostPosted: Wed Nov 21, 2007 11:52 am    Post subject: CV Quantizer PCB Layouts Reply with quote  Mark this post and the followings unread

I'm aware of at least three quantizer schematics available on the web; All of which have been discussed on this forum before---probably more than once. The discussions that usually accompany these designs are mostly beyond my comprehension. But the designs themselves look simple enough (as far as part-count anyway), and I have been searching for a DIY quantizer to build into my up-coming MFOS Sequencer project.

http://www.modularsynthesis.com/modules/DJB-013/DJB-013_schematic3.jpg
http://mypeoplepc.com/members/scottnoanh/birthofasynth/id15.html
http://www.mindspring.com/~clist/resource/circuits/cv_quant.html

However, I'm hoping that there may be someone here on the forum who has created a pcb layout that they would be willing to share? Anything?
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Etaoin



Joined: Jun 30, 2005
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PostPosted: Wed Nov 21, 2007 11:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Do you have a source for the AD7245 by any chance?
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ericcoleridge



Joined: Jan 16, 2007
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PostPosted: Wed Nov 21, 2007 12:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

I was hoping to get a free sample from Analog Devices. Their website says that it's an unreleased product.

I don't really understand if this means that the chip was discontinued and is now going to be available again, or if there is going to be a new/different chip released with the same product number (this seems strange)?
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Etaoin



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PostPosted: Wed Nov 21, 2007 12:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's probably the non-RohS part that has been discontinued and the RoHS compliant part that has still to be released.
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Clack



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PostPosted: Wed Nov 21, 2007 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

I will be willing to do it, Iv'e layed out 3 schematics already in eagle, I think I'm competent enough to do this ( find one here http://electro-music.com/forum/topic-21917.html ), VERY interested in a quantizer ( specifically for a sequencer )

I'll need to get a sample of that chip!

which circuit do you think offers the best features?

Last edited by Clack on Wed Nov 21, 2007 3:32 pm; edited 1 time in total
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Nov 21, 2007 3:18 pm    Post subject: Re: CV Quantizer PCB Layouts Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
http://www.modularsynthesis.com/modules/DJB-013/DJB-013_schematic3.jpg

don't know about that one.
Quote:
http://mypeoplepc.com/members/scottnoanh/birthofasynth/id15.html
scotts proven design

Quote:
http://www.mindspring.com/~clist/resource/circuits/cv_quant.html
definetely some errors in the schematic
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Clack



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PostPosted: Thu Nov 22, 2007 4:22 am    Post subject: Reply with quote  Mark this post and the followings unread

no samples available of it from AD im afraid ... off to farnell! £11! DAC are always very expensive. I started laying scotts one out, probably will split it into different boards as im using eagle light
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Last edited by Clack on Thu Nov 22, 2007 4:39 am; edited 1 time in total
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fonik



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PostPosted: Thu Nov 22, 2007 4:28 am    Post subject: Reply with quote  Mark this post and the followings unread

a layout would be great. i did not get the staircase generator working on the breadboard - i blame the cmos, being more straight i should blame myself Wink

so i still got this AD DAC waiting here.

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Etaoin



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PostPosted: Thu Nov 22, 2007 4:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
off to farnell


Farnell doesn't like to sell to private customers over here. Large minimum order and shipping fees (whereas companies have no minimum order and free shipping!).

So, any other sources?

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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Thu Nov 22, 2007 4:43 am    Post subject: Reply with quote  Mark this post and the followings unread

i've sadly gave up with this project because of AD (the IC) and AD (the company that doesn't send samples)

so sadly...
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Etaoin



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PostPosted: Thu Nov 22, 2007 4:49 am    Post subject: Reply with quote  Mark this post and the followings unread

I gave up on a DIY quantizer for a while when I managed to get a cheap Doepfer A156. But I probably want more quantizers anyway.

I was really looking for the AD/DA that is in the Elektor one, as that does different scales like Doepfer.

Sadly there don't seem to be any DIY PIC-based designs (like the A156). That saves one getting odd AD and DA's.

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Clack



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PostPosted: Thu Nov 22, 2007 4:50 am    Post subject: Reply with quote  Mark this post and the followings unread

I could bulk order some - buying over 10 it goes down to £8 - never bought from farnell before but I think it is available to me>. I need to get a credit card first! ( been meaning to get one for a while now )

RS ( i think it may be uk only ) its £25!!!

I dont know about US distributors but it says digikey does it ( is that business only? )

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Etaoin



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PostPosted: Thu Nov 22, 2007 4:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I dont know about US distributors but it says digikey does it ( is that business only? )


Digikey sell to everyone, but charge around $50-60 shipping to Europe.

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fonik



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PostPosted: Thu Nov 22, 2007 4:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Mr Clack wrote:
RS ( i think it may be uk only ) its £25!!!

RS components germany sells them for 27.-EUR (20£)

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para



Joined: Oct 16, 2006
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PostPosted: Thu Nov 22, 2007 5:25 am    Post subject: Reply with quote  Mark this post and the followings unread

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=630-0320&R=630%2D0320&sid=4744C6806E22E17F


http://www.jameco.com/webapp/wcs/stores/servlet/CatalogSearchResultView?langId=-1&storeId=10001&catalogId=10001&searchType=m&searchValue=ad7245a&categoryId=51006


http://search.digikey.com/scripts/DkSearch/dksus.dll?KeywordSearch
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Etaoin



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PostPosted: Thu Nov 22, 2007 5:41 am    Post subject: Reply with quote  Mark this post and the followings unread

As far as I can tell, none of these actually offer easy or cheap shipping to Europe.

Digikey is expensive, and Allied and Jameco won't quote shipping in the checkout, which usually means they ship the order and then charge you actual UPS or FedEx costs (which will be close to $75), like Mouser does.

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krisp14u



Joined: Nov 11, 2006
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PostPosted: Thu Nov 22, 2007 6:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Mr Clack wrote:
I could bulk order some - buying over 10 it goes down to £8 - never bought from farnell before but I think it is available to me>. I need to get a credit card first! ( been meaning to get one for a while now )



I order Quite alot from Farnell and could do a small group buy

Paul

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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Thu Nov 22, 2007 10:20 am    Post subject: Reply with quote  Mark this post and the followings unread

So I guess now it's time for me to say : "+1 for a pcb" Embarassed
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Clack



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PostPosted: Thu Nov 22, 2007 10:54 am    Post subject: Reply with quote  Mark this post and the followings unread

I wasn't planning on getting it professionally done, just for someone if they want to do press'n'peel. Wouldn't mind handing it over to someone though.

shamefully farnell only have 7 chips in stock dammit! gonna email them

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fluxmonkey



Joined: Jun 24, 2005
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PostPosted: Thu Nov 22, 2007 11:01 am    Post subject: Reply with quote  Mark this post and the followings unread

if DIY includes kits, i can recommend the blacet miniwave & hylander Quantizer ROM combo... i have 2 & am very happy w/ em. between expensive ad/da chips, precision resistors, and other related expenses (not least of which is time), you might find this to be a very cost-effective solution, even if you only use it as a quantizer.

b
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ericcoleridge



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PostPosted: Mon Nov 26, 2007 10:03 am    Post subject: Reply with quote  Mark this post and the followings unread

I ordered samples from Analog Devices last year without any problem. Received them express overnight shipping even!

Have they discontinued this service (still listed on website), or is it just a problem with this particuar IC--which seems to be temporarily(?) out of production?

I wonder if there isn't some other, more readily available, DA that could be substituted in this schematic?
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Clack



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PostPosted: Mon Nov 26, 2007 11:03 am    Post subject: Reply with quote  Mark this post and the followings unread

having trouble staying away from using jumper wires.
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mono-poly



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PostPosted: Mon Nov 26, 2007 11:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I still hope someone one day is gonna release a DIY quantizer.
But imho it should have lots of scales in it accesable by gate/triggers or cv Smile
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Clack



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PostPosted: Mon Nov 26, 2007 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

well finished it, um havn't tested it. Need an AD7245!

posting it to see if anyone wants to try it out/test it, or look through it for errors. the clock is not on this board though as it will be on the channels board! heh

all red are links, J1 is the link between AGND and DGND .
I found this usefull article on DA converters and grounding here
http://www.epanorama.net/wwwboard/messages/16215.html


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bugbrand



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PostPosted: Mon Nov 26, 2007 4:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey Ben,
I may be able to spare a 7245 'cos I just checked and found I'd got two as samples sometime last year (yeah, its a shame they seem to have changed their sample methods now - guess that was a golden age of many good free chips!)
- also, I think you've forgotten to connect the pin4 v-s of the 072s to the main V- used on R5.
I'll PM you..

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