Mail Archives: geda-user/2012/07/14/04:44:05
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On 14/07/12 04:41, Edward Comer wrote:
> This is a bit off-topic - but - I am reverse engineering a circuit
> board so that I can make a new PCB with some changes. There are two
> surface mounted transistors in SOT23 configuration. One that is marked
> "t04" and using a multimeter, it tests out as an NPN transistor and I
> found some documentation that states that a "t04" is a PMBS3904 which
> is equivalent to a 2N3904. However, the markings of the second
> transistor are a mystery to me (It is marked "MON") and it does not
> test out as an NPN or PNP transistor. I suspect that it may be a
> MOSFET. Does anyone have any info on this transistor???
Here's a link to a DIY curve tester....
http://www.techlib.com/electronics/curvetrace.html
This should give you very helpful info in your quest to reverse engineer!
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<div class="moz-cite-prefix">On 14/07/12 04:41, Edward Comer wrote:<br>
</div>
<blockquote
cite="mid:1342237267 DOT 98959 DOT YahooMailNeo AT web65902 DOT mail DOT ac4 DOT yahoo DOT com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:arial,
helvetica, sans-serif;font-size:12pt">
<div><font face="arial, helvetica, sans-serif" size="3">This is
a bit off-topic - but - I am reverse engineering a circuit
board so that I can make a new PCB with some changes. There
are two surface mounted transistors in </font><font
face="arial, helvetica, sans-serif">SOT23 configuration</font><span
style="font-size: 12pt; ">. One that is marked "t04" and
using a multimeter, it tests out as an <span
class="yiv1570670070yshortcuts yiv1570670070cs4-visible"
id="yiv1570670070lw_1342234476_0" style="cursor: pointer;
color: rgb(54, 99, 136); border-bottom-width: 2px;
border-bottom-style: dotted; border-bottom-color: rgb(54,
99, 136); "><span class="yshortcuts cs4-visible"
id="lw_1342237169_0" style="cursor: pointer;
border-bottom-width: 2px; border-bottom-style: dotted;
border-bottom-color: rgb(54, 99, 136); ">NPN transistor</span></span> and
I found some documentation that states that a "t04" is a </span><font
face="arial, helvetica, sans-serif">PMBS3904 which is
equivalent to a </font><font face="arial, helvetica,
sans-serif">2N3904. However, the markings of the second
transistor are a mystery to me (It is marked "MON") and it
does not test out as an NPN or PNP transistor. I suspect
that it may be a MOSFET. Does anyone have any info on this
transistor???</font></div>
</div>
</blockquote>
Here's a link to a DIY curve tester....<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.techlib.com/electronics/curvetrace.html">http://www.techlib.com/electronics/curvetrace.html</a><br>
<br>
This should give you very helpful info in your quest to reverse
engineer!<br>
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