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Message-ID:	<4ED3AD70.6060009@ecosensory.com>
Date:	Mon, 28 Nov 2011 09:49:04 -0600
From:	John Griessen <john AT ecosensory DOT com>
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To:	geda-user AT delorie DOT com
Subject:	[geda-user] Re: I want to do BGA prototype soldering
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In-Reply-To:	<20111128114541.a9359d0d.attila@kinali.ch>
Reply-To:	geda-user AT delorie DOT com

On 11/28/2011 04:45 AM, Attila Kinali wrote:
> On Sun, 27 Nov 2011 22:18:58 -0600
> John Griessen<john AT ecosensory DOT com>  wrote:
>
>> .8mm -- is that big enough to "do at home"?
>
> Yes and no. Yes, you can do it, no you need a good fan
> (not the usual ones you get at hardware shops) and some
> experience how to do it.

By fan, are you meaning hot air blower, or heat gun?
Like my 1650 Watt version?
>
> It's in my opinion easier to get a small electronics oven
> (like the one sold by elektor) and solder the BGA in there.
> Although other people report that using a normal kitchen oven
> works well for them, i do not recomend that as you have hardly
> any control on the temperature curve.

But modified with a ramp controller?

==

On 11/28/2011 09:07 AM, Bob Paddock wrote:
 > BGA's are still better than LGA's or even QFN's.
 >
 > The latter are a nightmare to get the flux out from under if your aim
 > is ultralow current, and want a service life of years.

Thanks, hadn't realized LGA's, qfn's were worse.

Is there a technique for doing those first few prototypes
washout well, or just plan on them not being usable long?

140 degrees F is what I've been told about water washout of flux.
maybe a water pik pump would survive that temperature?
Else, is pouring a stream of hot water from 2 feet up good for
dislodging flux under BGA's?

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