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 Forum index » DIY Hardware and Software » Thomas Henry designs
8038 VCO PCB layout for press'n'peel blue
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Sep 12, 2007 4:44 am    Post subject: 8038 VCO PCB layout for press'n'peel blue
Subject description: NEW VERSION
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hi all,

i etched a PCB for a dual version utilizing a THAT320 (manually matched transistors could be used, too),

this layout is mede according to my very own needs (panelmount using cliff sockets, 20mm grid).

if there would be enough interest i designed a common version following the dlabeling in the VCO cookbook and uploaded it to my site...

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Last edited by fonik on Mon Oct 29, 2007 5:14 am; edited 1 time in total
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Sebo



Joined: Apr 27, 2007
Posts: 541
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PostPosted: Wed Sep 12, 2007 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

It would be nice !!!
I'm going to build the XR VCO first, but I want to try this one in the future.
Thank you.

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Wild Zebra



Joined: Apr 28, 2005
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PostPosted: Wed Sep 12, 2007 3:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

that would be great fonik. Thanks. Your modular is growing quite rapidly.
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fluxmonkey



Joined: Jun 24, 2005
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PostPosted: Wed Sep 12, 2007 6:35 pm    Post subject: Re: 8038 VCO PCB layout for press'n'peel blue
Subject description: any interest?
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fonik wrote:
hi all,

i etched a PCB for a dual version utilizing a THAT320 (manually matched transistors could be used, too),

this layout is mede according to my very own needs (panelmount using cliff sockets, 20mm grid).

if there would be enough interest i designed a common version following the dlabeling in the VCO cookbook and uploaded it to my site...


very interested... i looked, but did not find. linkey?

b
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Sep 12, 2007 11:05 pm    Post subject: Re: 8038 VCO PCB layout for press'n'peel blue
Subject description: any interest?
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bbob wrote:
very interested... i looked, but did not find. linkey?

not yet...

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goldenechos



Joined: Jun 06, 2007
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PostPosted: Thu Sep 13, 2007 8:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Just made a board from your Lo Pass gate pnp fonik. brd turned out great. I am waiting on an order of Cliff sockets so I can build it. Thanx.

That said... I have am 8038 chip, I like your layouts, so I would be interested.

thanx again,
Tony
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fonik



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PostPosted: Thu Sep 13, 2007 9:49 am    Post subject: Reply with quote  Mark this post and the followings unread

goldenechos wrote:
Just made a board from your Lo Pass gate pnp fonik. brd turned out great. I am waiting on an order of Cliff sockets so I can build it. Thanx.

That said... I have am 8038 chip, I like your layouts, so I would be interested.

thanx again,
Tony

the layout i have done follows a 20mm grid for the cliff sockets (i created my own standard here Wink ). i will have to relabel all components according to the TH VCO chip cookbook so one could build it. when achieved this, i could redesign the layout without these cliff socket footprints.
said that, i think i will do it.

i won't publish any schematic since it is easily available from sMs (and recognize the current september back to school sale).

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goldenechos



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PostPosted: Thu Sep 13, 2007 12:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

I like the cliff sockets, a few less things to wire to the panel. WOuld you bne willing to share that version as well?

TR
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fonik



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PostPosted: Thu Sep 13, 2007 12:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

goldenechos wrote:
I like the cliff sockets, a few less things to wire to the panel. WOuld you bne willing to share that version as well?

TR

sure (as usual). but first i will have to do the relabeling of the parts...

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fluxmonkey



Joined: Jun 24, 2005
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PostPosted: Thu Sep 13, 2007 7:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

i recently built ken stones Synthacon filter, the verision designed to go behind a euroracak panel (tho i did mine in frac). it's laid out to use pcb mounted jacks, but since i'm unable to get them here in the states, i just used regular jacks wired with extremely short (like, clippings from resistor leads short) stubs. they were quite sturdy enough to support the PCB.

which is just to say, if you make a layout for pcb-mounted jacks, you can probably use it for panel-mount jacks with no modifications...

b
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23isgood



Joined: Nov 18, 2006
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PostPosted: Sat Sep 15, 2007 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes please Fonik. I would love to build my own 8038 VCO.

thanks
pete

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fonik



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PostPosted: Sun Sep 16, 2007 10:45 am    Post subject: Reply with quote  Mark this post and the followings unread

here is a pic of the populated PCB waiting for the frontpanel. i decided to have a breakout PCB for the 2nd VCOs sockets.

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

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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Sep 21, 2007 4:01 am    Post subject: Reply with quote  Mark this post and the followings unread

here we go. i added the press'n'peel blue layout to my site without schematic, but providing a "conversion table" to show the corresponding parts labels from the TH VCO chip cook book.

for now you'll find the layout for my version utilizing cliff sockets. a common version will follow.

i finished the VCOs yesterday and it sounds quite nice (a little bit aggressive IMO). the tracking is okay at the first glance (min 5 oct). i recognized a little bit cross-talk, not quite sure about the cause (shared opa packages?). and due to it's wide range yo can use it as LFO, too.

http://www.modular.fonik.de/Page39.html#Link268

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fluxmonkey



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PostPosted: Fri Sep 21, 2007 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

fonic--

very nice! this looks like your most complex PCB yet... congrats.

b
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fonik



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PostPosted: Fri Sep 21, 2007 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

bbob wrote:
fonic--

very nice! this looks like your most complex PCB yet... congrats.

b

thanks Very Happy
the super controller proto was much more complex, you know. but noone else than me saw it... i would upload it to my site but the file got lost! maybe i will redesign it some day.

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julianw



Joined: Jul 30, 2007
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PostPosted: Sun Sep 23, 2007 4:45 am    Post subject:   Reply with quote  Mark this post and the followings unread

Thanks for sharing this, I will have a go at making one now.

Cheers, Julian
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softfin



Joined: Oct 11, 2006
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PostPosted: Sun Sep 23, 2007 6:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Great project Fonik! Thanks for making your artwork available Smile

EDIT: Already found some 8038 chips! Thanks Level5 for informing about a source for these at a decent price.

Last edited by softfin on Mon Sep 24, 2007 8:05 am; edited 1 time in total
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Sebo



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PostPosted: Sun Sep 23, 2007 11:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank a lot Fonik.
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Level5



Joined: Feb 16, 2007
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PostPosted: Sun Sep 23, 2007 4:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

softfin wrote:

If some of you europeans are making an order to Reichelt or would be otherwise willing to sell 5 XR8038 chips, please let me know!


Reichelt is too expensive (11,45 Euro).

You can order them from www.bastler-shop.de (6,54 Euro)
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fonik



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PostPosted: Mon Sep 24, 2007 2:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
i recognized a little bit cross-talk, not quite sure about the cause (shared opa packages?).


i played a little bit with this dual VCO and the cross-talk is not only a cross-talk of audio. even the CVs influence each other.

i omitted decoupling caps in this design. perhaps this might cause the problems? maybe one of the real experts could chime in?

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Dragon's Lair



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PostPosted: Mon Sep 24, 2007 9:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Level5 wrote:


Reichelt is too expensive (11,45 Euro).

You can order them from www.bastler-shop.de (6,54 Euro)


Ouch!!
I ordered a dozen from http://www.electronicsurplus.com/ just type xr8038 into the search bar, $1.95 US each.
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para



Joined: Oct 16, 2006
Posts: 276

PostPosted: Wed Sep 26, 2007 2:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

whoa someone completely destroyed this source. hopefully it was someone here that will be spreading the ahhh "love" with a new pcb design


http://electronicsurplus.com/commerce/catalog/product.jsp?product_id=91597&czuid=1190228272081



steven
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Dragon's Lair



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PostPosted: Wed Sep 26, 2007 9:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's ridiculous !!
I ordered mine on Sept 23, they had 198 in stock @ $1.95
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Level5



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PostPosted: Thu Sep 27, 2007 2:11 am    Post subject: Reply with quote  Mark this post and the followings unread

38 in stock now - the current price is $6,95 Shocked
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23isgood



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PostPosted: Sat Oct 06, 2007 5:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dood! Thats pretty lame. I tried to order a few of these from, electronicsurplus.com and something was wrong with their website, and I could not place an order online, so I tried calling them during business hours and they would not answer the phone! So I was unable to place an order with them. Now there are only a few left and they cost almost five times more! Sheesh.
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