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 Forum index » DIY Hardware and Software » fonik's place
PCBs for Thomas Henry's X-4046 VCO
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Jul 09, 2012 1:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Z5U is the worst carbon capacitor you can get, i guess, however, they are cheap and i use them for decoupling. and that's what are the caps you referred to are for.
so yes, they are fine for this pupose.

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cheers,
matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Jul 09, 2012 1:09 am    Post subject: Reply with quote  Mark this post and the followings unread

BTW all who indicated interest in additional boards should check their PM#s and/or email...
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Argitoth



Joined: Jun 24, 2008
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PostPosted: Mon Jul 09, 2012 7:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Fonik! Another question!

Is it possible to remove the Coarse tune pot from the circuit? I just want to use the FM inputs to control the frequency. Basically, I would want to replace the coarse tune pot with a fixed resistor... maybe 50K so it sits half way through its range? How would I wire it?
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Jul 11, 2012 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Argitoth wrote:
Thanks Fonik! Another question!

Is it possible to remove the Coarse tune pot from the circuit? I just want to use the FM inputs to control the frequency. Basically, I would want to replace the coarse tune pot with a fixed resistor... maybe 50K so it sits half way through its range? How would I wire it?

no need to do this. just leave off the potentiometer R43 and the according input resistor R29.
you don't need the fine coarse control then either? (R44, R56)

anyways, maybe you rather want to replace the panel mount coarse pot R43 by a trimmer? you could just replace the header by a PCB mount multiturn trimmer... Cool

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Argitoth



Joined: Jun 24, 2008
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PostPosted: Thu Jul 12, 2012 12:18 am    Post subject: Reply with quote  Mark this post and the followings unread

I thought Todd Fletcher was offering a parts kit, but I've e-mailed and PMed him multiple times, no response... didn't even open the PM.
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Argitoth



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PostPosted: Sun Jul 15, 2012 5:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's my panel. How do you like them's apple's? 8hp. No coarse tune. I will mostly be controlling this via Silent Way or use a DC offset module.
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Last edited by Argitoth on Thu Sep 13, 2012 10:17 am; edited 1 time in total
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Skrog Productions



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PostPosted: Tue Jul 17, 2012 10:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Matthias.

Thanks for the quick delivery , all good & safe , im looking forward to building these Smile .

Cheers.

Dave


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Skrog Productions



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PostPosted: Tue Jul 17, 2012 10:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Argitoth ......

Nice layout , classic knobs to the top and jacks at the bottom .

Dave.
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Argitoth



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PostPosted: Tue Jul 17, 2012 11:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Skrog Productions wrote:
Argitoth ......

Nice layout , classic knobs to the top and jacks at the bottom .

Dave.


Thanks! I only do that if I have to and if I want to fit everything in the smallest space possible. If I really like a module, then I tend to make it small because I want many copies. Wink
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inlifeindeath



Joined: Apr 02, 2010
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Location: Albuquerque, NM

PostPosted: Fri Aug 03, 2012 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

hmm, so despite my requests in the past for more boards, i never got a notification that they were available again Sad ...
do you have any more boards left Fonik?

Thanks!

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fonik



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PostPosted: Fri Aug 03, 2012 12:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

inlifeindeath wrote:
hmm, so despite my requests in the past for more boards, i never got a notification that they were available again Sad ...
do you have any more boards left Fonik?

Thanks!

currently not. someone over at muffs planned to do a eurorack panel (metalphoto top notch), alas, it did not happen yet. wanted to reßorder as soon as they are available...

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inlifeindeath



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PostPosted: Sun Aug 05, 2012 6:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

that's pretty disappointing considering i've already been waiting months for you to announce the newest run. oh well, gonna have to make my own.
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fonik



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PostPosted: Mon Aug 06, 2012 10:23 am    Post subject: Reply with quote  Mark this post and the followings unread

hey, all my fault! i am very sorry, it seems i did not track your request properly!

i want to sort this out right now! just tell me how many you need (up to 4 complete sets), and i will mail them this week!

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fonik



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PostPosted: Mon Aug 06, 2012 2:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool
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inlifeindeath



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PostPosted: Mon Aug 06, 2012 11:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Once again verifying that Matthias is a solid dude and a true gentleman. All is well, thanks again!
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Argitoth



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PostPosted: Tue Aug 07, 2012 10:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey Mr. Fonik, could you tell me the hole size and the #x # square that the PCB mounting holes sit on?
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fonik



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PostPosted: Wed Aug 08, 2012 4:41 am    Post subject: Reply with quote  Mark this post and the followings unread

PCB measurements:
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the holesize is 3.2mm (0.126)

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fonik



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PostPosted: Wed Aug 08, 2012 4:43 am    Post subject: Reply with quote  Mark this post and the followings unread

notice that the PCBs could be mounted back on back. the power connector on the waveshaper is mirrored...
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Argitoth



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PostPosted: Wed Aug 08, 2012 12:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
notice that the PCBs could be mounted back on back. the power connector on the waveshaper is mirrored...


You're crazy! no thanks! Twisted Evil

... Twisted Evil
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fonik



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PostPosted: Wed Aug 08, 2012 12:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

the idea was to mount them on bot sides of a bracket, so that you still can reach all thise trimmers.
i mounted them all in paralel to to the frontpanel, though Very Happy

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elmegil



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PostPosted: Wed Aug 08, 2012 1:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm planning to use a long/flexible enough cable that I can lay them side-by-side/flat while I'm testing and tweaking and then fold it over and mount parallel but back to back as you say, Fonik. Needs a 2U wide dotcom panel to fit the jacks and knobs anyway, and it fits in parallel very nicely. (in my plans anyway Smile)
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Argitoth



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PostPosted: Wed Aug 15, 2012 2:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
Z5U is the worst carbon capacitor you can get, i guess, however, they are cheap and i use them for decoupling. and that's what are the caps you referred to are for.
Is C10 also used for decoupling?
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Aug 15, 2012 2:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Argitoth wrote:
fonik wrote:
Z5U is the worst carbon capacitor you can get, i guess, however, they are cheap and i use them for decoupling. and that's what are the caps you referred to are for.
Is C10 also used for decoupling?

yes it is. it is going across the CD4046 from Vdd to Vss.

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Argitoth



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PostPosted: Wed Aug 15, 2012 3:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

marvkaye wrote:
http://w1.lancair.net/photos/2xNPNas394-2.jpg


Hmm... I don't know what to do with the matched transistors and 3k tempco I got from MFOS. Should I do it exactly like the picture above? Except I have thermal paste. Should I do it like the picture above except put thermal paste inbetween the transistors and sit the tempco on top and have some thermal paste on that as well?

Or maybe I can put the tempco between the transistors so the transistors touch the tempco and not each other and have thermal paste all inbetween?
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fonik



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PostPosted: Thu Aug 16, 2012 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

i use termal glue.

transistors back to back like in the pic with a thin film of termal paste (glue), 2k PTc resistor on top (again with termal paste/glue).

ther termal conditions of the two transitors should be as equal as possible.

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