That power supply is also known as an autotransformer.<br><a href="https://en.wikipedia.org/wiki/Autotransformer">https://en.wikipedia.org/wiki/Autotransformer</a><br><br>Care should be taken with an autotransformer, while the voltage can be set low, there is no, none, zero galvanic isolation.<br>
Meaning the full current of the service is available (20amps). Treat the output as you would treat 120VAC direct from a receptacle...<br><br>I've never seen one in the lab, but they do have a variable DC supply that is maybe 3amps and 30v max.<br>
Depending on the load, the heating element, you might be able to use one of those twisty things for lights...<br>Alternatively, an AC thermostat for bang bang control with hysteria should also work if you keep the thermal loop tight.<br>
<br>The last and best option would be a ~$14 PID controller from ebay, that would give the best thermal regulation. <br>Sometimes they come in a kit with an SSR (solid state relay) and a thermocouple for a little more dough...<br>
Here's one kit for $24...<br><a href="http://www.ebay.ca/itm/100-240V-Digital-PID-Temperature-Controller-max-40A-SSR-K-Thermocouple-Probe-/290825156892?pt=LH_DefaultDomain_0&hash=item43b687b91c">http://www.ebay.ca/itm/100-240V-Digital-PID-Temperature-Controller-max-40A-SSR-K-Thermocouple-Probe-/290825156892?pt=LH_DefaultDomain_0&hash=item43b687b91c</a><br>
<br><br>Michael<br>--<br><a href="http://krazatchu.ca/">http://krazatchu.ca/</a><br><br><br><div class="gmail_quote">On Thu, Jul 4, 2013 at 4:07 PM, Henri Kuschkowitz <span dir="ltr"><<a href="mailto:henri.kuschkowitz@gmail.com" target="_blank">henri.kuschkowitz@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">So, I am still getting some more costs tomorrow, but I think I might go with this quick/dirty setup: <a href="http://www.youtube.com/watch?v=wVEf7PfuKxo" target="_blank">http://www.youtube.com/watch?v=wVEf7PfuKxo</a> <div>
<br></div><div>What do you guys think? This leads me to my next question, would anybody know if the lab has an item similar to this:<div><div><a href="http://www.temcoindustrialpower.com/products/Variable_Transformers/TVT001.html?utm_source=temcotransformer.com&utm_medium=Banner+Ad&utm_campaign=Variac+TVT001" target="_blank">http://www.temcoindustrialpower.com/products/Variable_Transformers/TVT001.html?utm_source=temcotransformer.com&utm_medium=Banner%2BAd&utm_campaign=Variac%2BTVT001</a></div>
<div> </div><div><br></div><div>Cheers all,</div><div>Henri</div><div><br></div><div><div><div>On 2013-07-04, at 7:54 AM, Alex <<a href="mailto:alexbarbour@bell.net" target="_blank">alexbarbour@bell.net</a>> wrote:</div>
<br><blockquote type="cite">
<div dir="auto" bgcolor="#ffffff">
<div><font face="Arial">Henri</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Angle iron is a common name applied to steel
angles. some are extruded in the heavier sections and have a sharp outside
corner.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Some are bent from flat stock and have a radiused
corner.</font></div>
<div><font face="Arial">These are better for use as formers for
plastics.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Home depot. Hardware dept.</font></div>
<div><font face="Arial">CTC ect.</font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px" dir="ltr">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b>
<a title="henri.kuschkowitz@gmail.com" href="mailto:henri.kuschkowitz@gmail.com" target="_blank">Henri Kuschkowitz</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="alexbarbour@bell.net" href="mailto:alexbarbour@bell.net" target="_blank">Alex</a> </div>
<div style="FONT:10pt arial"><b>Sent:</b> Wednesday, July 03, 2013 9:12
AM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [Lab] Plastic Bending
Strips</div>
<div><br></div>
<div>Hey Alex,</div>
<div><br></div>
<div>I have a very particular type of acrylic we are going to be using that I
doubt comes 'bendable'. Angle iron? I haven't seen those before. Got a
reference or suggestion?</div>
<div><br></div>
<div>Cheers,<br>Henri</div>
<div><br>On 2013-07-03, at 8:03, Alex <<a href="mailto:alexbarbour@bell.net" target="_blank">alexbarbour@bell.net</a>>
wrote:<br><br></div>
<blockquote type="cite">
<div>
<div><font face="Arial">On the other hand they do produce an acrylic
sheet that can be bent cold .</font></div>
<div><font face="Arial">Have done small pieces by hand. For larger OR
thicker ( say 1/8 inch + )one needs a former for the edge. Angle iron with a
round egde serves well.</font></div>
<div><font face="Arial">Alex B</font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px"><div><div class="h5">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b>
<a title="henri.kuschkowitz@gmail.com" href="mailto:henri.kuschkowitz@gmail.com" target="_blank">Henri Kuschkowitz</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="lab@artengine.ca" href="mailto:lab@artengine.ca" target="_blank">lab</a> </div>
<div style="FONT:10pt arial"><b>Sent:</b> Tuesday, July 02, 2013 3:09
PM</div>
<div style="FONT:10pt arial"><b>Subject:</b> [Lab] Plastic Bending
Strips</div>
<div><br></div>Hey guys,
<div><br></div>
<div>I figured it's a good time to start asking the collective for some
feedback. We are planing on bending larger sheets of acrylic (they will
definitely not fit into the laser cutter) and I am looking at <a href="http://www.briskheat.com/p-152-rh-plastic-bending-strip-heater.aspx" target="_blank">bending
strip heaters</a> to build a custom heating element for our purposes.
Before I go ahead ordering the pieces I was wondering if anyone had ever
used such a thing and/or knows of a good local source? For saving some
money, I wonder if reusing a baseboard heater could do the trick :P</div>
<div><br></div>
<div>Cheers all,</div>
<div>Henri<span style="white-space:pre-wrap">
</span></div><div><br></div>
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