<div dir="ltr"><br><br><div class="gmail_quote">2010/7/13 Shachar Shemesh <span dir="ltr"><<a href="mailto:shachar@shemesh.biz">shachar@shemesh.biz</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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Hi list,<br>
<br>
I bought a USB connected logic analyzer for too much money (not that
much). When buying, I did a mistake and not thought through the issues,
and bought from a US supplier without telling them this needs to be a
220V country. As a result, I got an external power supply that is 110V,
which outputs 12V AC at 1000mA (why they do not write "1A", I do not
know).<br>
<br>
To my shame, I actually bought a universal DC supply without noticing
that it's AC I need, and started a support call with the company. They
were very nice, and when we, finally, found out the source (I hope it
is it), the guy said I could probably get by with 18VDC, but it would
strain the capacitors (my math suggests that 15VDC is closer to the
mark).<br>
<br>
So, does anyone know where I can get a 12V AC power supply? They are
not exactly a commodity.<br>
<br>
Thanks,<br>
Shachar<br>
<pre cols="72">--
Shachar Shemesh
Lingnu Open Source Consulting Ltd.
<a href="http://www.lingnu.com" target="_blank">http://www.lingnu.com</a>
</pre>
</div>
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<br></blockquote><div>Shahar, I have two suggestions for you:<br>1-220/110 converters "for foreign travel" consist usually of an autotransformer converting 220V to 110V for use with small appliances. you can feed your 110V power supply through them.<br>
It's worth checking with an electrical tester which way to insert it in the socket in order to get the voltage of the outputs at 0, 120 V to ground, not 110, 220V to ground, something that your equipmnent might no like. I have a small on in my junkyard. Unfortunately the maximum output current or power is not mentioned and it might be too weak for your needs.<br>
2-Spot halogen bulbs working at 12V ac are pretty common. I would ask lamp manufacturers/merchands or buy one of suitable power and size. At this ratio of voltages between input and output the converter is most likeky a real transformer, with good insulation between the primary and secondary circuits. This is readily checked with an ohmmeter.<br>
Again, I have in my junkyard a (bare) unit, extracted from an old lighting fixture, marked Pri 0-230V , Sec 0-12V 50 VA. It is clearly a real transformer, and looks allright.<br>You can have any of them, or both, for the asking. I live in Jerusalem.<br>
Cheers, Avraham<br></div></div><br></div>