Path: csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!peer03.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!Xl.tags.giganews.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Sun, 06 Sep 2015 02:05:02 -0500 Reply-To: spam@flippers.com Subject: Re: Transistor identification? References: <0001HW.1B9B87FD00098A2611E4F83CF@news.eternal-september.org> <0001HW.1B9B93C0000C4BC311E4F83CF@news.eternal-september.org> <0001HW.1B9C0F160029341611E4F83CF@news.eternal-september.org> Newsgroups: sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical From: John Robertson Date: Sun, 6 Sep 2015 00:05:02 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <0001HW.1B9C0F160029341611E4F83CF@news.eternal-september.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Message-ID: Lines: 40 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-Mn9WQ4uQgtvGFHuwEn2f4ym4yBKL9fvSVjauRHyuF8d5df8vgg0luY8XDFqmV4Gc5P3f/gR98AvEkjQ!1bJ6XEEeyVwvQ2Pl03hOOnnqSql9Sde1bKUx1rjgGvFUvk0XkdSScEpVYpT0TnAMkLnwv5PCatA= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 2849 X-Received-Bytes: 2961 X-Received-Body-CRC: 3580188930 Xref: csiph.com sci.electronics.basics:46204 sci.electronics.components:5727 sci.electronics.design:375836 sci.electronics.repair:67815 alt.engineering.electrical:16610 On 09/05/2015 11:05 PM, DaveC wrote: >> [Who] made the item in question. [?] >> John :-#)# > An American offset printing equipment company. It=E2=80=99s a paper/env= elope feeder > for a small offset presses. Extinct company. > > I can say that the bandwidth requirement of the circuit is very small=E2= =80=94DC-10 > KHz=E2=80=94and low current. Don=E2=80=99t know about gain. > > Thanks. > There are pretty simple circuit diagrams out there to measure gain if=20 you have more transistors with the same markings. One example: http://electriciantraining.tpub.com/14179/css/14179_111.htm The only other criteria are breakdown voltage and current. If it only=20 drives other transistors and resistors to Vcc are over around 2K then it = is likely 100ma or less. If you know the Vcc you know the minimum breakdown voltage unless it is=20 being used to control solenoids that have their own B+ source, then that = voltage is your absolute minimum (times at least 2). John :-#)# --=20 (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out."