X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=UvCC+uY2D/BULvGPr3Bl2tVQ1DIevjxuryItsQG0jAo=; b=UsOBZhpd0Bo1KkyLZgboUcvMLSfZp5SytMQie+jAWLOu4F3eIgHri9gRh/C18ITOb0 Ud3a/DUHxi2kh+HbedNfcH/v1AUNJ7rt0c2dhp8uHWdm7yQH+SLQ7i55WmKhEAPT0H30 jXb01lICPgCGWSsw2C0GnifsTxfH977Xpv7G1aKQmgslSjqJJKmT8WBYb4t0UEolAD4G 1nwnoI8gAtqWVIZHyXY31lOA0Yo7Plsdsz+Hb99d6r3TknocgLYoqJB8pExhkv/UNcvQ DdW/JV8hajBSL6hX/cbPm6+Htm53CXTgKQAanOz4LJUbfBh1W/pR//WQBkGsV/6MoTsf OCVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=UvCC+uY2D/BULvGPr3Bl2tVQ1DIevjxuryItsQG0jAo=; b=TzTGmkR47HdtbNXV4pGgOrMPlcP0Zy8OiHPDcoPahjJg6Q1jHrNvoT2uMcTc3IPps4 gfTenyd2QqisXth34088DtLKIuqpZnecDa7QFSNOWrb0Deeaz8DVUjwNOUfFpOW+SjyT wy9ka03+vYszyLEv3O81xKFbtKqiBDR89sMdbe2t3b9DSVnpPcVkCUh7ATOtBv/GYmN+ 8nBeIavTvUYkLjITkvwa04cK3vKRtn3hUAwdQEtgbtrELnC71tkHSGoACKtWo5SNtJC+ GbSaPWOYMLw1r2oFA3yGGmVtcdpNthZ5Lcq7hchdt2zcVXPxELYVSRhOp3Bq2Rlz1dpg AYYw== X-Gm-Message-State: AFeK/H3HMqPxvhIZYGAYiC3dKEeASvC1W1KVOazF8911xUyikd70vX8NyUSahec+tRqlXpq2/HXlv1xJL+t2eg== X-Received: by 10.25.168.15 with SMTP id r15mr11169986lfe.70.1490208010732; Wed, 22 Mar 2017 11:40:10 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <20170322172551 DOT DF40C8106DD0 AT turkos DOT aspodata DOT se> From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" Date: Wed, 22 Mar 2017 14:40:10 -0400 Message-ID: Subject: Re: [geda-user] handsolder QFN packages To: gEDA users mailing list Content-Type: text/plain; charset=UTF-8 Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk On Wed, Mar 22, 2017 at 2:27 PM, DJ Delorie wrote: > > I've done bottom-only QFNs with a hotplate and by hand; the trick is to > design the footprint so that the pads extend out past the edge of the > part far enough to get your soldering iron in there. Use extra solder > (or put paste on the pcb and reflow with your iron) and use the extended > pads to drag the excess solder away from the part. > > I think the best approach with an iron is to put paste down, then the > part, hold it in place with some sort of "third hand" (tape or a > weight), and use the iron to reflow the paste. > > And I can't find a photo online of what I'm talking about, so: > http://www.delorie.com/pcb/soldering-tricks/ Have you done any with exposed center pad? -- Home http://evanfoss.googlepages.com/ Work http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/ -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2 mQENBFYy4RYBCAC183JomLtbdAlcKiaPDoVHq52LDmVmH75aiEc69m7YxDt54/ai VtYCAobbGVIyn3Hlz3uhF6LnPl/6Lm1VdnCfpwu3KQhCO6ds10ow2C30X4ohCqOd hCVg5C+ILmQkEffFrFODy3ji+PYTF4pADvHCWsTMv0hf0llwFOJsBCK6cl02IffE JPqy4PjM1nZ9HpzT84JBaG/4OGvTZ8SQ2yFUl265jagvygPTf88H1xpZHH1r8dB1 stjUHLmPH8AOyDgKxFchgGeDc3p/vJtgDDIXAFfDXG0NSRovLmtaQdGxe47Zf/go bXiEM7YL2WqQe5zfEA919JxkEwlDKYniOSVzABEBAAG0N0V2YW4gRm9zcyAoVGhp cyBpcyBteSBwdWJsaWMga2V5LikgPGV2YW5mb3NzQGdtYWlsLmNvbT6JATkEEwEC ACMFAlYy4RYCGwMHCwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCIpQTcE8nN bbBaCACAm8pU5lG1ev2Fsw68Axtcl57SJrYieqX96c3YuYH9JpqMqJRnd9nDKw9X tQuvuH7tUk0VbOaDqReOYJVI/4c5wb9AaOFp6K2DUcupq6XhgXpvz3HzoPwjAdIj XuQzdRUx5+innTJrSkGuBYW/CZ2zqEx4xfLlq4rO0hoTUMR8QVp2cCrkw6BT0m86 APIw/ZnjoxM8IEzr7MxfRIg3qpzrZk28rmhx+k78Jyk61UhwcCPGIm/pjUopTwYJ 3YBdRB2cYD2aN7A1JVf5cRmSQYooHBGpH0kYvomGk97PKqypVuJ7OpG9xM58wUcC qUVt9hKlePLzP8csYjt8onqI7qIIuQENBFYy4RYBCADlH8spG3WkCx62vB5mr5Z0 SCDd/RcyA4A5y5EOj5KurQkrSWpgi9Ho1yKruMJ6blQR2qkc66KqH9pnXDm/ZI1M K/wdW3ngETxBmXoozzFMT89aEWIVR5/PFodWK1elekE9iJxACuR98Zg2QttTD3x8 A9w8VEyMLOXcDTrPFpHegMKswFBg5iuMulAdXAoGejWTI3n+qKFpabHm2Lfs6wjk 5rjucpTdeFK6UeWF1xAvNxXibuu5BlGwv53930qIXRwO/Gn2Rh5DXWxKU2fEIme/ xgQQmIsDeUoWbfybdjw/x7Q0LW4mINiLDQcGHHRQKFIxbAJCT3USPLGh5xwE9/Er ABEBAAGJAR8EGAECAAkFAlYy4RYCGwwACgkQiKUE3BPJzW0uYAf9Hf30n8tM3mR2 Zo6ESE0ivgdgjaJtAWrBUx7JzAzPjBnBOlNnu5Y9lVEqetvUPH6e3PvaHYUuaUU8 0HwxuKBW9nUprgV6uIu1DZmlcp+SxpbuCy7RDpNocRLNWWFMaYYzznmTgfnTgD4D gCq8Mf1mcfrluTkOAo+QNqbMfl1GISClopRqxVuAo59ewgMnFujwgd8w12BwWl24 CzqOs5HqcUslePj+LzcjSNgVCklYwKl+0dsb/fctMOCtHodwqm2CBJ+zydvNmYkD fxda/J91Z1xrah5ec++FL0L4vs+jCiIWJeupJFKlr1hCMZiiGH7W554loK5l4jv3 EY347EidAw== =Ta4p -----END PGP PUBLIC KEY BLOCK-----