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<div class="moz-cite-prefix">On 18/06/2014 1:09 AM, Gary Buhrmaster
wrote:<br>
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cite="mid:CAMfXtQzttLxqQPY_cD4idUcSMdCf5SRwJMNyzL3gvAWvOeSE=g@mail.gmail.com"
type="cite">
<pre wrap="">On Tue, Jun 17, 2014 at 1:54 PM, Fred Hamilton <a class="moz-txt-link-rfc2396E" href="mailto:fred@yonkitime.com"><fred@yonkitime.com></a> wrote:
....
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<pre wrap="">I'll second that. When my hdpvr "died" a few years ago, I probed the voltage coming from the adapter and saw it was low and crazy ripple-y.
</pre>
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<pre wrap="">
A common failure mode for those (POS) power adapters is that
the caps fail (heat in a (mostly) enclosed plastic case is the
death of most (cheap) electrolytics that are used), which results
in bad ripple.
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<pre wrap=""> So I cut the cord from the adapter and soldered it to a USB connector. I found a 5V 1A USB charger, plugged it in, and it's worked like new ever since.
Might even work plugged into one of your PC's USB ports...
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<pre wrap="">
1A is possibly on the low side. Hauppauge specs 2A,
and sells a replacement (in the US) for around $10 through
their web store(*). I presume the new one has the same
failure mode as the original, but for $10, another few
years of use might be an acceptable investment for
those that do not want purchase something better (or
resort to soldering).
Depending on the PC USB port (and version), it may not be
able to provide more than 100ma without negotiation (although
many dedicated USB charging ports provide more, even
without negotiation, PC ports may require some amount of
negotiation). As with all else, your particular MB will vary.
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<span style="color: rgb(51, 51, 51); font-family: Tahoma, Calibri,
Verdana, Geneva, sans-serif; font-size: 13px; font-style: italic;
font-variant: normal; font-weight: normal; letter-spacing: normal;
line-height: normal; orphans: auto; text-align: left; text-indent:
0px; text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(242, 246, 248); display: inline !important;
float: none;">In<span class="Apple-converted-space"> </span></span><i
style="color: rgb(51, 51, 51); font-family: Tahoma, Calibri,
Verdana, Geneva, sans-serif; font-size: 13px; font-variant:
normal; font-weight: normal; letter-spacing: normal; line-height:
normal; orphans: auto; text-align: left; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(242, 246, 248);">Battery Charging
Specification</i><span style="color: rgb(51, 51, 51); font-family:
Tahoma, Calibri, Verdana, Geneva, sans-serif; font-size: 13px;
font-style: italic; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: auto;
text-align: left; text-indent: 0px; text-transform: none;
white-space: normal; widows: auto; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color: rgb(242, 246,
248); display: inline !important; float: none;">,[31] new powering
modes are added to the USB specification. A host or hub Charging
Downstream Port can supply a maximum of 1.5 A when communicating
at low-bandwidth or full-bandwidth, a maximum of 900 mA when
communicating at high-bandwidth, and as much current as the
connector will safely handle when no communication is taking
place; USB 2.0 standard-A connectors are rated at 1500 mA by
default. A Dedicated Charging Port can supply a maximum of 1.8 A
of current at 5.25 V. A portable device can draw up to 1.8 A from
a Dedicated Charging Port. <b>The Dedicated Charging Port shorts
the D+ and D- pins with a resistance of at most 200?</b>.<b> The
short disables data transfer, but allows devices to detect the
Dedicated Charging Port and allows very simple, high current
chargers to be manufactured</b>. The increased current (faster,
9 W charging) will occur once both the host/hub and devices
support the new charging specification.<br>
<br>
</span>
<blockquote
cite="mid:CAMfXtQzttLxqQPY_cD4idUcSMdCf5SRwJMNyzL3gvAWvOeSE=g@mail.gmail.com"
type="cite">
<pre wrap="">
Gary
(*) Given they sell the replacement adpaters, one can
conjecture that it is a common accessory that needs
replacement after some period (usually, right after
the warrantee expires :-)
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