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 Forum index » DIY Hardware and Software » Thomas Henry designs
SN-Voice BOM?
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eframp



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PostPosted: Wed Sep 17, 2008 7:48 am    Post subject: SN-Voice BOM? Reply with quote  Mark this post and the followings unread

Hi folks -

Has anybody created a successful/tested BOM for the SN-Voice, preferably based around US suppliers...and would you mind sharing it?

I can figure out the semis and resistors (usually), but for some reason the capacitor selection in DIY kits always has me stumped.

Thanks
Eric

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State Machine
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PostPosted: Sat Sep 20, 2008 9:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
but for some reason the capacitor selection in DIY kits always has me stumped.


Eric,

Do you need a list of distributors who will supply the SN Voice Capacitors? What is it that is not clear? Perhaps I can help. Very Happy

Bill
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eframp



Joined: Sep 11, 2007
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PostPosted: Sat Sep 20, 2008 9:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can find the distributors. It's that choosing the best kind of any particular kind of cap seems to stymie me. There are too many choices! I was looking for wisdom from some of y'all with (much) more experience in that task than I've got.

I went on and made some decisions in the meantime based on what Paul S. uses for the MOTM stuff (and some other guesswork), and I figure I'll just drop 'em in and see if I blow anything up. As long as I just watch my polarity on the electrolytics...right?

e

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PostPosted: Sun Sep 21, 2008 8:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I can find the distributors. It's that choosing the best kind of any particular kind of cap seems to stymie me. There are too many choices! I was looking for wisdom from some of y'all with (much) more experience in that task than I've got.


Well, C5 can actually be a ceramic disc capacitor also instead of a polyester that is specified. It's only for the noise clock so it is not critical at all.

The Mylars you need to be careful and don't get ones with a high working voltage (say 600V) as they will be too big to fit physically into the PC board. Usually the 50 to 100 volt ones should be fine for my board.

As for the the electrolytic capacitors, a working voltage of 25 or 35 V should be fine as they will then be able to fit also. Too high a WV and your lead spacing will be too great. These capacitor types get larger at higher working voltages because they will run the risk of shorting across the insulated layer that sits between the plates if set too close. The solution, well the plates are usually a thin film of rolled aluminum and the insulator must be thicker to achieve this larger distance between these plates to work at higher voltages. The trade off is now you need more plate area and a thicker insulator, thus the larger capacitor diameter and height size. And yes, they are polarized so please pay attention to that detail.

Here, try this link. This had been posted before on this forum and will prove helpful ..........

http://www.reliablecapacitors.com/pickcap.htm

Bill
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eframp



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PostPosted: Sun Sep 21, 2008 8:52 am    Post subject: Reply with quote  Mark this post and the followings unread

This is exactly the sort of info I was looking for. Thanks a bunch!
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PostPosted: Sun Sep 21, 2008 9:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
This is exactly the sort of info I was looking for. Thanks a bunch!


Glad to be of service Wink

Oh, nice resume to. Impressive .... I saw your website Very Happy

Bill
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eframp



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PostPosted: Sun Sep 21, 2008 10:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!
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