Yah, I think I just hadn't realized that those power connectors weren't both "Power In" connections, even after seeing them being shorted against each other in the schematic I figured that we must have exceed the rating for the individual connectors or something.<br>
<br>If you add up all the outputs (that go through the Molex connector) it comes out to be 2.6 A, plus whatever regulator tax is being shoved into those heat sinks.<br><br>And thank you all for options on where to get standard station supplies from, I will definitely be studying eHam reviews for the next little while.<br>
<br><br><div class="gmail_quote">On Sat, Dec 4, 2010 at 4:45 PM, Dick Faust <span dir="ltr"><<a href="mailto:k9ivb@cox.net">k9ivb@cox.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Erik<br>
The LPU does accept 13.6 VDC nominal input and provides a pass through connection. If you view the schematic and specs available on the wiki, you will find that this is so.<br>
<a href="http://openhpsdr.org/wiki/index.php?title=LPU" target="_blank">http://openhpsdr.org/wiki/index.php?title=LPU</a><br>
<br>
You can use a switcher or a linear mode power supply, but if doing any weak signal work you should consider a linear supply. Astron makes a variety of linear units at different capacities, but not the only source.<br>
<br>
The connectors are Power Pole and I have had a good experience with Power Werx with my orders<br>
<br>
Power Werx also has some very good info on assembling Power-Pole - and good component drawings and FAQs.<br>
<br>
Home Page<br>
<a href="http://www.powerwerx.com/" target="_blank">http://www.powerwerx.com/</a><br>
<br>
For General Assembly<br>
<a href="http://www.powerwerx.com/assembly.asp" target="_blank">http://www.powerwerx.com/assembly.asp</a><br>
<br>
For help index: FAQs, Drawings, Shipping [domestic & international] etc<br>
<a href="http://www.powerwerx.com/helpcenter.asp" target="_blank">http://www.powerwerx.com/helpcenter.asp</a><br>
<br>
Dick Faust K9IVB<br>
<br>
Erik Anderson wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
***** High Performance Software Defined Radio Discussion List *****<br>
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<br>
Okay, I've been doing a bit of research and asking a few questions, time to come back here and query the experts again about getting this project at least up to smoketest level ;-)<br>
<br>
As there is no 13.5v output line on the LPU, I'm assuming that the output described on the website is actually the input and is obviously meant to be a battery input. (I really don't want to know what 10A draw would do to my 7Ah brick batteries though)<br>
(*) Can someone confirm that this thing is really expecting 10A, especially with the BOM/schematic saying that it's PTC-fused to 5A (or 7A with the 3.3v kit)?<br>
<br>
I have been told that a 12v power source will not work with this due to the regulators, I'm guessing that U4 in particular will not be fond of an input voltage so near its output voltage.<br>
(*) DigiKey only has a single 13.5v transformer on their entire website (8A switched, Part T1051-P51-ND), would this be a good choice (especially as it's under-rated), does the switching introduce noise that the LPU cannot regulate back out again?<br>
(*) I've had one person say that a power source would contain a transformer, rectifier, and regulator and that for 10A my best bet might be to order the parts and build my own somewhere.<br>
<br>
The guy at the local hardware store recognized the power connectors on the board as being manufactured by some company like STEXA or something (only saw the name for a few seconds), says that they're rated at 15A and 16AWG and that he can special-order them.<br>
(*) Why are there two pairs of connectors, especially if each connector can handle the full power load and the schematic shows that they are shorted against each other?<br>
<br>
Again, thank you all for your help and patience.<br>
Erik Anderson KE7YOA<br></div></div>
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