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ElectroNotes 129 TZVCO PCB Layout
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forbin



Joined: Jan 29, 2009
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PostPosted: Mon Mar 08, 2010 8:24 pm    Post subject: ElectroNotes 129 TZVCO PCB Layout Reply with quote  Mark this post and the followings unread

Here is a Press'n'Peel layout for the TZVCO from Bernie Hutchins as decribed in the ElectroNotes 129. Bernie has given me the OK to put this out here for anybody to use in a non-commercial manner. Please read all the notes and especially his original excellent article. There is a lot to be learnt by going through this circuit! I will post a TIFF of the PCB as well as it is often easier than getting the scaling right from a PDF!


ElectroNotes129_ThroughZeroVCO.pdf
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Layout

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forbin



Joined: Jan 29, 2009
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PostPosted: Mon Mar 08, 2010 8:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is a GIF -- it was smaller then the TIFF. Has the advantage for drawings that you don't get the artifacts that JPEG produces... it is at 300 dpi by the way...


tzvcof7 2.gif
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tzvcof7 2.gif



Last edited by forbin on Mon Mar 08, 2010 11:23 pm; edited 1 time in total
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Danno Gee Ray



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PostPosted: Mon Mar 08, 2010 8:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Do you by chance have a component side drawing?
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forbin



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PostPosted: Mon Mar 08, 2010 9:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

It is in the PDF -- in the first post...
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Luka



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PostPosted: Mon Mar 08, 2010 10:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

great!
shame i just made 3 teezers

maybe ill do 3 of these also Smile

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Pehr



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PostPosted: Tue Mar 09, 2010 3:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice!

3080 though, but I could always put a 13700 on a protoboard beside. Very Happy

Any BOM? panel wiring diagram?

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andrewF



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PostPosted: Tue Mar 09, 2010 4:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Pehr wrote:
Nice!

3080 though, but I could always put a 13700 on a protoboard beside. Very Happy

Any BOM? panel wiring diagram?


Has to be a 3080, have a read of the notes.

Thanks Forbin
I tried to lay this out a while ago but found it very tricky. now I don't have to
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Sebo



Joined: Apr 27, 2007
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PostPosted: Tue Mar 09, 2010 9:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi:
Thank a lot for the layout!!!
Can I use a 2SA798 instead the SSM2220?

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andrewF



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PostPosted: Tue Mar 09, 2010 10:05 am    Post subject: Reply with quote  Mark this post and the followings unread

yep, my vero-board version uses a 2sa798
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Sebo



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PostPosted: Tue Mar 09, 2010 1:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

OK, Thank you.
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frijitz



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PostPosted: Tue Mar 09, 2010 6:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:
shame i just made 3 teezers

I'll be happy to refund your money if you are unhappy with them.

Ian
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Luka



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PostPosted: Tue Mar 09, 2010 6:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

i very much doubt i'll be unhappy with them ian Smile

hopefully i will have them all going tonight too as i just got my shipment of 10turn pots Smile

comment was more in reference to having a wide selection of TZ modules instead of putting all eggs in one basket, no reference to singular qualitative preference

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vtl5c3



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PostPosted: Wed Mar 10, 2010 11:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Very cool, Forbin! I built a pair of these VCOs many moons ago and love them.
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philpeery



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PostPosted: Sat Mar 13, 2010 3:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, this is totally cool! I've always wanted to build the EN tzo! Thanks Forbin for doing this layout! It looks like a very nicely done PCB. Has anone put it together yet? I have all the semi's, and am just wondering how it sounds! If anyone has it running, PLEASE post a few sound clips. Once I get one (or two, or four!) running, I will do the same.

-Phil
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frijitz



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PostPosted: Sun Mar 14, 2010 4:18 am    Post subject: Reply with quote  Mark this post and the followings unread

andrewF wrote:
Has to be a 3080, have a read of the notes.

Looks to me like OTA-1 does not need to be a 3080. OTA-2 does need to be a 3080, because it uses the the special W. Jung trick. You could replace the VCA with a 13700-based one.

Very Happy

Ian
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forbin



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PostPosted: Sun Mar 14, 2010 6:43 am    Post subject: Reply with quote  Mark this post and the followings unread

True Ian -- i did contemplate quite a few changes -- especially making the integrator and the sine converter an LM13700. It does make the PCB a bit more of a nightmare! With 3080's still being a few dollars from Futurlec I decided to keep it faithfull to the original... Now having built it... and debugged my stuff ups in laying it out... I would not really change that much!
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Sound



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PostPosted: Mon Mar 15, 2010 12:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice project forbin. Very Happy

frijitz wrote:
because it uses the the special W. Jung trick.


Ian what is the W. Jung trick? I see in the schematics other use for the negative supply. In which Jung book or where is explained it?
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forbin



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PostPosted: Mon Mar 15, 2010 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I think it was in the Unique IC OpAmp Applications. A colleague had all of these and I have a very vague recollection of reading a bit of it years ago. See: http://waltjung.org/Walts_Books.html Unfortunately for me he is on the other side of the world these days...

The technique was also used in another free electronotes, number 72, the Timbre Modulator. See: http://electronotes.netfirms.com/EN72TM.pdf

The EN#72 article alludes to a more detailed analysis of the 3080 supply control techniques in EN#63 -- which I have never read, but Bernie may well be willing to make it available...
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Sound



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PostPosted: Mon Mar 15, 2010 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks forbin
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Sebo



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PostPosted: Tue May 11, 2010 11:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Forbin:
I just read in your blog that you missed some resistor in your TZ VCO PCB design.
http://forbinthesynthesizer.blogspot.com/2010/02/through-zero-plane.html
Do you corrected the PCB layout posted here?
If not, could you name what resistors are missing?
Thank you.

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forbin



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PostPosted: Tue May 11, 2010 9:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

The posted layout is fixed. I moved a couple of bits slightly as well as i found some tracks a little bit too close to each other. If you look at the photo on the blog and the layout on the PDF file i think that you will notice the slight changes in a couple of the IC's... Certainly a lot less painful layout than the 921B... my work colleague keeps suggesting 4 layers! which is fine for BGA's but a complete cop-out for through hole!
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v-un-v
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PostPosted: Wed May 12, 2010 5:42 am    Post subject: Reply with quote  Mark this post and the followings unread

frijitz wrote:
Luka wrote:
shame i just made 3 teezers

I'll be happy to refund your money if you are unhappy with them.


Personally, with the amount of blood, sweat and tears that went into the R&D of the Teezer, I would suggest that it would be 100 (if not more?)-fold, better bet, to invest in Ian's design?

Forgot to add, thx for the PCB anyway Forbin, it's always nice to see new projects! Very Happy

Just my 2 pence

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Sebo



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PostPosted: Wed May 12, 2010 7:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Forbin!!!
I will be etching the PCB soon.

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PostPosted: Wed May 12, 2010 10:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Etched a board tonight and the sizing came out wrong for me. I think the pcb layout needs to be a bit larger to accommodate the ICs and resistors better. Also, the spacing between the ground plane and traces could be a bit wider.

I'll let you know how it goes when I finish this tomorrow.

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PostPosted: Thu May 13, 2010 4:25 am    Post subject: Reply with quote  Mark this post and the followings unread

forbin wrote:
Here is a GIF -- it was smaller then the TIFF. Has the advantage for drawings that you don't get the artifacts that JPEG produces... it is at 300 dpi by the way...


Why don't you send a PNG file instead? TIFF's are huge, but sending a gif is causing problems too (because if you say that the dimensions of a TIFF are going to be 2cm x 3cm, that's what you will get!)

On the other hand, a PNG works more like a Jpeg, in that it is a compressed format, but it retains many of the characteristics that a TIFF would retain (including no artefacts), yet is much smaller.

You could also send a DXF/DWG file, but the best kind of information is vector-based, because of there being a mathematical relation between points (vectors), so in theory, you should get the correct result every time. At the end of the day, a vector is best, because there is no pixelation of the image, just nice solid black lines.

I really don't get why people don't use PNG files more often. I've heard that the ONLY browser not to support PNG has been Internet Explorer, but then times have changed quite a lot since then, and Microsoft now, are even condemning Flash! I've never had a problem with PNG, and use it all the time.

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IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
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