Re: [TCML] MMC pics

["Nicholas J. Goble" <ngoble@xxxxxxx>]

Bart,

Yeah that does suck, but I'd rather take advice from a veteran than 
risk destroying the MMC.  How do I unsolder the leads?  Also, with all 
this soldering and unsoldering, am I damaging the caps and resistors?  
I know that resistors are pretty sensitive to heat, but what about 
caps?  I don't want to destroy anything.

I also don't want to buy another perf board.  I'm running low on funds. 
 Radio shack didn't have anyones that were long enough for me anyways.  
I have some scrap wood lying around and some spray acrylic polyurethane 
sealer.  Could I seal the wood and mount the caps on that?  I've heard 
that wood is lossy, so that's why I didn't use it in the first place.  
If wood doesn't work, do you have any suggestions as to where I could 
locally buy a long perf board (Indianapolis)?  I don't want to order 
one online because 1) Low Funds and 2) I don't like waiting.

By the way, does it matter what kind of solder I use?  I used some lead 
based PC resin core solder.  

I know that's a lot of questions, but I feel like I'm kind of stumbling 
here.  Thanks for your guidance.

Nicholas Goble



On 7/11/08 8:51 PM, "bartb" <bartb@xxxxxxxxxxxxxxxx> wrote:

> Nicholas,
> 
> Big problems. The solder side series string is being staggered in 
> sections of 3 on a square perf board. Your leads are far too close 
> together between "most" sections. If you fire it up like this, your 
> going to get arcing between the sections. Think of this: If you have 
12 
> caps in series and say 12kV across the cap bank, then there will be 
3kV 
> across each 3 cap section in your circuit. Another 3kV on the next 
> section, etc. The area with the bottom red and green circles will have 
> 6kV across those 2 very near leads. However, the middle caps leads of 
> those 2 sections are even closer. That's probably the main arcing spot.
> 
> You need to keep some distance. This square board isn't going to help 
> you much. You would be better off with a caps side by side in a single 
> run. Long perf board versus a square one.
> 
> I know it sucks to hear that after you've soldered all the leads, but 
it 
> is what it is.
> 
> Take care,
> Bart
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> 


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