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MuBase
Joined: Mar 24, 2011
Posts: 81
Location: London UK
Audio files: 5
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 Posted: Sat Nov 26, 2011 11:29 am Post subject:
 SN voice shrink dip question....
Subject description: 76477 sockets .?... |
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Hi! Steve (MUbase) here..
I am happy to say thay yesterday I recieved the SN Voice PCB (Thanks to Bill!!) AND the 76477 chip at the same time!! ( One from USA one from China.)
The 76477 I have is a Phillipines SDip and not the cockroach style..
I was wondering whether it is possible to get the Socket for these sizes anywhere anymore but if not can I just solder the chip to the board without one..??
I understand the risks involved but I'm an OK solderer. Had plenty of experience... 
Thanks . : ))))))))))))))))))))))))))))))))))
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mark_olson
Joined: Oct 26, 2006
Posts: 177
Location: Lawrence, Kansas
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| Posted: Sat Nov 26, 2011 3:13 pm Post subject:
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That socket is not hard to find, google for it and you'll find lots. Sure you can do without but the "risks" if you could call them that, revolve more around issues of diagnostics and repair than anything else. Not long after I build my SN Voice I had an issue with another module that uses the same IC and it sure was nice to be able to easily swap ICs between the two whilst troubleshooting. If I had soldered the ICs in, swapping them would have been one of the last diagnostics I would have tried.
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MuBase
Joined: Mar 24, 2011
Posts: 81
Location: London UK
Audio files: 5
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| Posted: Sat Nov 26, 2011 5:04 pm Post subject:
Not the usual... |
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Thanks but I don't know..?! This isn't a usual 28 pin ( like Arduino and Pic) nor is is the usual wide body... I couldn't find anything on ebay and the only place I could find was digikey but they are £5.82 each??? Could you point me in the right direction??
It is 0.070" pitch and 10.16mm width spacing.... "Shrink dip" hmmm...
If it's too much hassle I will just solder applying just enough heat...
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diablojoy
Joined: Sep 07, 2008
Posts: 729
Location: melbourne australia
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| Posted: Sat Nov 26, 2011 6:08 pm Post subject:
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you could try using 2 x SIL machined sockets
any width is possible to accommodate then, just make sure you solder them in nice and vertical.
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magman
Joined: Feb 04, 2009
Posts: 351
Location: Liverpool, UK
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mark_olson
Joined: Oct 26, 2006
Posts: 177
Location: Lawrence, Kansas
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| Posted: Mon Nov 28, 2011 7:49 am Post subject:
Re: Not the usual... |
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| MuBase wrote: | Thanks but I don't know..?! This isn't a usual 28 pin ( like Arduino and Pic) nor is is the usual wide body... I couldn't find anything on ebay and the only place I could find was digikey but they are £5.82 each??? Could you point me in the right direction??
It is 0.070" pitch and 10.16mm width spacing.... "Shrink dip" hmmm...
If it's too much hassle I will just solder applying just enough heat...
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Sorry, I may have misunderstood. Do you also mean that the pin spacing of your chip doesn't match either footprint on the PCB, in which case you need not just a socket but a socket that is also an adapter?
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MuBase
Joined: Mar 24, 2011
Posts: 81
Location: London UK
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| Posted: Wed Nov 30, 2011 6:13 am Post subject:
Chip filts board but socket hard to find... |
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Well! It fits on the board ( small size ) BUT the socket is a bastard to find.. ( £4.02 from digikey which I thought was alright until I saw the £12.00 shipping cost!!!). RS online do them if you want a tube of 24 for £29.00!!! ( i even phoned up RS and asked if they would sell me one but no. ). Then I thought about buying a tube and flogging the rest on Ebay but that would take forever.....
Then I came back to here and saw the excellent idea of HACKing said shrink dip item to fit from magman!
So I think the HACKsaw it is!!
Thanks ( again ) Magman.!.!.
I'll post the results....;0)
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mark_olson
Joined: Oct 26, 2006
Posts: 177
Location: Lawrence, Kansas
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| Posted: Wed Nov 30, 2011 6:58 am Post subject:
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I'm kind of surprised (but I certainly take your word for it) because when I've used these chips, I just had the sockets in my parts bin already, don't even know where or when I got 'em.
Sawing down a DIP socket sounds good enough alright.
This thread has me thinking, though, that the next time I buy parts in bulk I will order some SIL strips as insurance against the perils of overconfidence in my parts bin.
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MuBase
Joined: Mar 24, 2011
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diablojoy
Joined: Sep 07, 2008
Posts: 729
Location: melbourne australia
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| Posted: Mon Jan 02, 2012 9:42 pm Post subject:
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received some sn voice boards just before xmas
and finally got to checking my sn chips which i had stashed away
will have to follow magmans suggestion also it seems
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magman
Joined: Feb 04, 2009
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Location: Liverpool, UK
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