<html><body><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000"><div>Those look useful to keep on hand for their adjustability. I guess you adjust the gold screw to adjust the output? It's bigger than I'd like for my final product, but looks great for early fiddling/prototyping. <br></div><div><br></div><div>How does one find these things on ebay from a reputable seller? I've heard that there is useful stuff on ebay, but wading around gets overwhelming (the Digikey catalog is also overwhelming for me)<br></div><div><br></div><div><br></div><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Michael Grant" <michael@krazatchu.ca><br><b>To: </b>"Justin Slootsky" <justin@slootsky.org><br><b>Sent: </b>Saturday, January 25, 2014 1:28:40 PM<br><b>Subject: </b>Re: [Lab] Voltage Regulators<br><div><br></div><div dir="ltr"><div><div><div><div><div>Hi Justin,<br><div><br></div></div>Not local, but you can get an adjustable output switchmode buck converter on a PCB for about $1 via eBay.<br><a href="http://www.ebay.ca/itm/DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1-23V-30V-/181227591312?pt=LH_DefaultDomain_0&hash=item2a32019690" target="_blank">http://www.ebay.ca/itm/DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1-23V-30V-/181227591312?pt=LH_DefaultDomain_0&hash=item2a32019690</a><br>
<br></div>I order them by the 10's to keep a bunch in stock. <br></div>I'm not sure if I will make this Wednesday's ModLab but I can mail you one if you want.<br><div><br></div></div>Michael<br>--<br></div><a href="http://krazatchu.ca/" target="_blank">http://krazatchu.ca/</a><br>
<div><div><div><div><br></div></div></div></div></div><div class="gmail_extra"><br><div><br></div><div class="gmail_quote">On Sat, Jan 25, 2014 at 10:17 AM, Justin Slootsky <span dir="ltr"><<a href="mailto:justin@slootsky.org" target="_blank">justin@slootsky.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'm new to electronics, so newbie simple answers are quite possibly appropriate.<br>
<br>
I have a project that needs 12V for LEDs and 5V to power the BeagleBone that is driving the LEDs.<br>
<br>
I'm using a LM7805C to regulate the voltage down from 12V to 5V, and it is functioning well, but it is getting hot.<br>
<br>
I added a binder clip to act as a heat sync, but still, depending on where I'm measuring, I can get a temperature reading of up to 80C.<br>
<br>
My final plan for this would be to encase the wiring/circuitboard in some sort of container, so that type of temperature is not going to be suitable.<br>
<br>
I have read that there are other types of voltage regulators (switching regulator?) that can be used in scenarios like this, but I'm not sure where to source just one of those. The only local walk in source for electronics that I've found is Active Electronics, and they don't seem to have much (and much of what they have seems expensive).<br>
<br>
Is there anywhere local that I can find a voltage regulator that is going to run cooler than this one?<br>
<br>
[ I'm still at breadboard stage, so it doesn't need to be the same formfactor as the LM7805C ]<br>
<br>
Thanks.<br>
<br>
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