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U58 is the designator on Apache Lab boards for U24 in the TAPR schematic. It's tiny. The instructions for assembling the ANAN-10 PA/case suggest a stick-on heatsink to be applied to the _back_ of the PC board under the switcher. It is listed as optional. While my order for the Hermes board was nominally for a "TAPR" board, apparently I got an "Apache" board, at least as far as the silk screen is concerned. :-)<br> <br>Chris Day<br>AE6VK<br> <br>[Apologies for any duplicate messages. Microsoft changed the way mail works again, and I haven't figured it out yet. Grrrr.]<BR><br> <BR><div>> Date: Sat, 3 Nov 2012 08:58:40 +0100<br>> To: hpsdr@lists.openhpsdr.org<br>> From: la2ni@online.no<br>> Subject: Re: [hpsdr] heat sink for u58<br>> <br>> ***** High Performance Software Defined Radio Discussion List *****<br>> <br>> <br>> Hi Steven.<br>> <br>> U58?????? This is the switcher in the 5 V PSU. There is no space for a <br>> heat sink. The only IC that needs a heat sink is the ADC, U10. Search for <br>> copper coolers for DRAM on e-bay. I bought 16 from China. May be you can <br>> find them locally, ask the PC over-clocking people.<br>> <br>> 73, Kjell<br>> <br>> <br>> <br>> <br>> <br>> På Fri, 02 Nov 2012 23:41:43 +0100, skrev stephen pearce <br>> <pearce.sg@gmail.com>:<br>> <br>> > ***** High Performance Software Defined Radio Discussion List *****<br>> ><br>> <br>> <br>> -- <br>> Sendt med Operas revolusjonerende e-postprogram: http://www.opera.com/mail/<br>> _______________________________________________<br>> HPSDR Discussion List<br>> To post msg: hpsdr@openhpsdr.org<br>> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org<br>> HPSDR web page: http://openhpsdr.org<br>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/<br></div> </div></body>
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