delorie.com/archives/browse.cgi   search  
Mail Archives: geda-user/2017/03/22/14:01:58

X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-ASG-Debug-ID: 1490205652-097fa263f643ba7e0001-9re8WH
X-Barracuda-Envelope-From: gheskett AT shentel DOT net
X-Barracuda-RBL-Trusted-Forwarder: 204.111.2.17
From: "Gene Heskett (gheskett AT shentel DOT net) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
X-Barracuda-Effective-Source-IP: n64s149.fttx.shentel.net[204.111.64.149]
X-Barracuda-Apparent-Source-IP: 204.111.64.149
X-Barracuda-RBL-IP: 204.111.64.149
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] handsolder QFN packages
Date: Wed, 22 Mar 2017 14:00:51 -0400
X-ASG-Orig-Subj: Re: [geda-user] handsolder QFN packages
User-Agent: KMail/1.9.10 (enterprise35 0.20100827.1168748)
References: <20170322172551 DOT DF40C8106DD0 AT turkos DOT aspodata DOT se>
In-Reply-To: <20170322172551.DF40C8106DD0@turkos.aspodata.se>
X-KMail-QuotePrefix: >
MIME-Version: 1.0
Message-Id: <201703221400.51991.gheskett@shentel.net>
X-Barracuda-Connect: smtp1.edbg.cloud.shentel.net[204.111.2.17]
X-Barracuda-Start-Time: 1490205652
X-Barracuda-URL: https://204.111.1.147:443/cgi-mod/mark.cgi
X-Barracuda-Scan-Msg-Size: 1421
X-Virus-Scanned: by bsmtpd at cloud.shentel.net
X-Barracuda-BRTS-Status: 1
X-Barracuda-Spam-Score: 0.50
X-Barracuda-Spam-Status: No, SCORE=0.50 using per-user scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=6.0 tests=WEIRD_PORT
X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.37420
Rule breakdown below
pts rule name description
---- ---------------------- --------------------------------------------------
0.50 WEIRD_PORT URI: Uses non-standard port number for HTTP
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id v2MI0tws023477
Reply-To: geda-user AT delorie DOT com

On Wednesday 22 March 2017 13:25:51 karl AT aspodata DOT se wrote:

> Is it possible to handsolder QFN packages, something like [1] ?
>
> Hälsningar,
> /Karl Hammar
>
> [1] http://assets.nexperia.com/documents/data-sheet/PUSB3FR4.pdf
>
I think a reflow oven would be faster, and there are numerous diy 
instructions on the net as to how to do this with a modified toaster 
oven. You would have to start with a scrubbed clean pattern on the 
board, anointed with a drop of solder paste, place the device on the 
paste in about the correct position and heat. The reflow is a wetting 
process by the solder, and it will suck a minor miss-alignment with the 
conductor pads into near perfect alignment as the solder "wets" the 2 
surfaces.

The modification parts may cost more than the basic oven, its a $20 bill 
at Walmart. You'll need to replace the mechanical temp controls with an 
SSR and a timer so it can reach a higher temp for a short time.

How much is that device in 100's? I may have a place for quite a few.

> ----------------------------------------------------------------------
>- Aspö Data
> Lilla Aspö 148
> S-742 94 Östhammar
> Sverige
> 0173 140 57


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

- Raw text -


  webmaster     delorie software   privacy  
  Copyright 2019   by DJ Delorie     Updated Jul 2019