ElectroNotes 129 TZVCO PCB Layout

forbin · Posted: Mon Mar 08, 2010 8:24 pm Post subject: ElectroNotes 129 TZVCO PCB Layout

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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ElectroNotes129_ThroughZeroVCO.pdf

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forbin · Posted: Mon Mar 08, 2010 8:27 pm Post subject:

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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Danno Gee Ray · Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA

Do you by chance have a component side drawing?

forbin · Posted: Mon Mar 08, 2010 9:49 pm Post subject:

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

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

great!
shame i just made 3 teezers

maybe ill do 3 of these also Smile

Pehr · Posted: Tue Mar 09, 2010 3:08 am Post subject:

Nice!

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

Any BOM? panel wiring diagram?

andrewF · Posted: Tue Mar 09, 2010 4:04 am Post subject:

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

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

andrewF · Posted: Tue Mar 09, 2010 10:05 am Post subject:

yep, my vero-board version uses a 2sa798

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

OK, Thank you.

frijitz · Posted: Tue Mar 09, 2010 6:24 pm Post subject:

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

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

vtl5c3 · Posted: Wed Mar 10, 2010 11:32 am Post subject:

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

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

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

frijitz · Posted: Sun Mar 14, 2010 4:18 am Post subject:

forbin · Posted: Sun Mar 14, 2010 6:43 am Post subject:

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!

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Nice project forbin. Very Happy

forbin · Posted: Mon Mar 15, 2010 2:12 am Post subject:

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...

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Thanks forbin

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

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.

forbin · Posted: Tue May 11, 2010 9:44 pm Post subject:

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!

v-un-v · Posted: Wed May 12, 2010 5:42 am Post subject:

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

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

synthmonger · Posted: Wed May 12, 2010 10:47 pm Post subject:

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.

v-un-v · Posted: Thu May 13, 2010 4:25 am Post subject: