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Date:	Sat, 14 Jul 2012 07:48:05 -0700 (PDT)
From:	Edward Comer <ecomer AT yahoo DOT com>
Subject:	Re: [geda-user] Help Identify MON Transistor??
To:	"geda-user AT delorie DOT com" <geda-user AT delorie DOT com>
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If it is a mosfet the gate should appear to behave like a small capacitor (=
WRT one of the other pins). Do you have a capacitance meter?=0A=0A- No, I h=
ave no capacitance meter. However, given that the E-B junction has no condu=
ctivity in either direction, it would appear to be MOSFET. Additionally, it=
s function in the circuit is as a binary switch of up to 500ma @ 5V. MOSFET=
 would be good for such a purpose. So given the E-B=A0behavior=A0and the in=
tended function, I still suspect a MOSFET. I was hoping that the "MON" woul=
d mean something meaningful other than my assumption of "MO" - "N" channel.=
=0A=0A- I do have another circuit that I was working that has a microcontro=
ller with the markings removed.My=0A    favourites are the parts with numbe=
rs sanded off...=0A=0ADoes the circuit still work? If so you could probably=
 get a good=0A    idea of the function of the part with a little careful ob=
servation=0A    of the circuit in operation.=A0=0A- Yes, fully functional, =
which is the basis of my assumptions mentioned above. I intend to clone the=
 portion of the circuitry that has the MON SOT-23 chip and I was just hopin=
g that the "MON" would actually identify the chip more precisely.=0A=0A- I =
don't think that the photo adds anything of value but it is at this link:=
=0Ahttp://www.flickr.com/photos/23036115 AT N03/7568124520/=0A=0A=0A- The link=
 below has the portion of my reverse engineered schematic that has the MON =
marked transistor, which is identified as Q2. It is not, as far as I know, =
a BSS123 - that SYM was just handy.=0Ahttp://www.flickr.com/photos/23036115=
@N03/7568162370/=0A=0A=0A- If no one knows exactly what it is, I intend to =
substitute a FDV303N for it, in my cloned design:=0Ahttp://www.fairchildsem=
i.com/pf/FD/FDV303N.html
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
ial, helvetica, sans-serif;font-size:12pt"><div style=3D"font-family: arial=
, helvetica, sans-serif; font-size: 12pt; "><span style=3D"font-family: 'ti=
mes new roman', 'new york', times, serif; font-size: 12pt; ">If it is a mos=
fet the gate should appear to behave like a small=0A    capacitor (WRT one =
of the other pins). Do you have a capacitance=0A    meter?</span><br></div>=
<div><span><font face=3D"times new roman, new york, times, serif" size=3D"3=
">- No, I have no capacitance meter. However, given that the E-B junction h=
as no conductivity in either direction, it would appear to be MOSFET. Addit=
ionally, its function in the circuit is as a binary switch of up to 500ma @=
 5V. MOSFET would be good for such a purpose. So given the E-B&nbsp;</font>=
<font face=3D"times new roman, new york, times, serif">behavior</font><font=
 face=3D"times new roman, new york, times, serif" size=3D"3">&nbsp;and the =
intended function, I still suspect a MOSFET. I was hoping that the "MON" wo=
uld mean something meaningful other than my assumption of "MO" - "N" channe=
l.</font></span></div><div style=3D"font-size: 12pt; font-family: arial, he=
lvetica, sans-serif; "><div style=3D"font-size: 12pt; font-family: 'times n=
ew roman', 'new york', times, serif; "><div id=3D"yiv1319957895"><div style=
=3D"font-family: 'times new roman', 'new york', times,
 serif; ">=0A    <br>- I do have another circuit that I was working that ha=
s a microcontroller with the markings removed.My=0A    favourites are the p=
arts with numbers sanded off...<br>=0A    <br>=0A    Does the circuit still=
 work? If so you could probably get a good=0A    idea of the function of th=
e part with a little careful observation=0A    of the circuit in operation.=
&nbsp;</div><div style=3D"font-family: 'times new roman', 'new york', times=
, serif; ">- Yes, fully functional, which is the basis of my assumptions me=
ntioned above. I intend to clone the portion of the circuitry that has the =
MON SOT-23 chip and I was just hoping that the "MON" would actually identif=
y the chip more precisely.</div><div style=3D"font-family: 'times new roman=
', 'new york', times, serif; "><br></div><div style=3D"font-family: 'times =
new roman', 'new york', times, serif; ">- I don't think that the photo adds=
 anything of value but it is at this link:</div><div><a href=3D"http://www.=
flickr.com/photos/23036115 AT N03/7568124520/">http://www.flickr.com/photos/23=
036115 AT N03/7568124520/</a><br></div><div><br></div><div>- The link below ha=
s the portion of my reverse engineered schematic that has the MON marked tr=
ansistor, which is identified as Q2. It is not, as far as I know, a BSS123 =
- that SYM was just handy.</div><div><a
 href=3D"http://www.flickr.com/photos/23036115 AT N03/7568162370/">http://www.=
flickr.com/photos/23036115 AT N03/7568162370/</a><br></div><div><br></div><div=
>- If no one knows exactly what it is, I intend to substitute a FDV303N for=
 it, in my cloned design:</div><div><a href=3D"http://www.fairchildsemi.com=
/pf/FD/FDV303N.html">http://www.fairchildsemi.com/pf/FD/FDV303N.html</a><br=
></div></div><br> </div> </div>  </div></body></html>
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