X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 723906 DOT 2428 DOT bm AT omp1024 DOT mail DOT ac4 DOT yahoo DOT com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1342277286; bh=FrHeXufdkAz/BEWwRzM6co7Adg7M/T2xvNZPH/fpGqU=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=eme6i1Yre1M/q7xNQuFxP/K3Y1fSG7DLm4vJ7sgk2m2knsJFd6Lhm0+mq7YYRCZiLiSQNvlFKC02nLcA55Z18WPwyBYyB+USARg4gZETdZUCCdoF2+nXaj6O6MrszO8l7woeI9n8Pd3Zd9FIlk/9K/Ml46HxIPaFiIF1yqUO3/M= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=yluWpzPUfsYAUpkCHY/Lez1VTiGk8uXDx02Gk6k9L5zjz2+weC65bPtPxE2XLEiXf/helYypG1jdxbdubSPt1jYFEDC8X5KGRySOhbs6a7NuP2m64ZV5STMlgF3S0Hk+5HUqpdDvQ0zRiQTJx8UhwbHeJDglhByKB17lmSCRog0=; X-YMail-OSG: Kx1tRSwVM1lhB9KwWjTrOe.84A9nNNML1EUUwkR1dE75JBn Is0eojr5.E6TkddNcGujfCrKAc4b_sK8QCCow4GNNinSvbxZqYLn1VlnAKuN 9JRyWWIY80VLCICAK7hPI5RMfSKK9WUwiMPclqhaOFNO0YA_8DwV1_xE0Fhp nNT96E61_qMLJw0cFt586GbBjaeI4NxTXS5RNl8T83oBR1k4S0btgtf.PPS4 iBM2IFhwMi3ZIigQ.JimbMgI4ErmqJQFsTdski3bm3trooLqZ0knZWU_ky6Z 0YMNHWwyd2PpyimDaMaghlC82DKXkjliHHzflSBUOS.gZYGswiqeSeZq1Drs zXBdCi77NLpl7w0KKGiFrIteIiGvNgsRPGR13asEey8a7RlOYzknbr0wAghW a0gY.CGTPIlvOVAutBbfGBapj7_BBg6D0HHudVhCBansab8fQWF4h8A830Pu AiQQKrWDczu_JjA6oTh.ML9Pksin_ZYIs0L4bjGvoOGA1OOWxWouI3X6gwCK h6MJmbAntqwS2S9EolKAirYBP8Se5NClxZesRPEoJbaYBYY2wTZDiWisji5h QT.e996wFIw.HiXHwZkvhmb5aMzAEHzm2qMs1yWn5bJvHnjf94qhi.E88s_C hSmSsbdlUU4i_rNZmjaTKRefTlUk0acX_pYCuHyDvd6W3natT7O03x1WOun2 eoU5wOWP55Zu.LYkgEobEL7o- X-Mailer: YahooMailWebService/0.8.120.356233 References: <1342237267 DOT 98959 DOT YahooMailNeo AT web65902 DOT mail DOT ac4 DOT yahoo DOT com> <5001303C DOT 2060408 AT estechnical DOT co DOT uk> Message-ID: <1342277285.73961.YahooMailNeo@web65901.mail.ac4.yahoo.com> Date: Sat, 14 Jul 2012 07:48:05 -0700 (PDT) From: Edward Comer Subject: Re: [geda-user] Help Identify MON Transistor?? To: "geda-user AT delorie DOT com" In-Reply-To: <5001303C.2060408@estechnical.co.uk> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="90432438-1868652459-1342277285=:73961" Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk --90432438-1868652459-1342277285=:73961 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable 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 --90432438-1868652459-1342277285=:73961 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
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?
=
- 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 = behavior 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.
=0A
- 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...
=0A
=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.=  
- 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.

- I don't think that the photo adds= anything of value but it is at this link:

- 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.

- If no one knows exactly what it is, I intend to substitute a FDV303N for= it, in my cloned design:

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