Building a transformer
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From: Mark Fortune on 8 Aug 2006 17:40 ian field wrote: > You can't beat a microwave oven transformer with a secondary transplant! > And I see plenty of old microwaves just laying out on the street destined for the scrap heap around here. thanks for the idea. Mark
From: Tim Wescott on 8 Aug 2006 17:48 Jim Thompson wrote: > On Tue, 08 Aug 2006 21:19:21 GMT, "ian field" <dai.ode(a)ntlworld.com> > wrote: > > >>"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in >>message news:99uhd21d83biuj4122hfrv1p47k4gip41h(a)4ax.com... >> >>>On Tue, 8 Aug 2006 13:44:27 -0700, "RST Engineering \(jw\)" >>><jim(a)rstengineering.com> wrote: >>> >>> >>>>What primitive semiconductors did you use in the output stage, or was it a >>>>toob device? Did we have 2N3055s in '75? I don't memember. >>>> >>>>Jim >>>> >>> >>>[snip] >>> >>>I'm trying to remember what semiconductors I used. But, IIRC, >>>2N3055's *were* available around that time. >>> >>> ...Jim Thompson >>>-- >>>| James E.Thompson, P.E. | mens | >>>| Analog Innovations, Inc. | et | >>>| Analog/Mixed-Signal ASIC's and Discrete Systems | manus | >>>| Phoenix, Arizona Voice:(480)460-2350 | | >>>| E-mail Address at Website Fax:(480)460-2142 | Brass Rat | >>>| http://www.analog-innovations.com | 1962 | >>> >>>I love to cook with wine. Sometimes I even put it in the food. >> >>Was it Ge or Si ? >> > > > It was Silicon. I didn't use any Germanium power devices since I > boosted my car radio back when I was a junior in high school. > > ...Jim Thompson Correction: it _is_ silicon. http://www.onsemi.com/pub/Collateral/2N3055-D.PDF. Digi-Key has them for $2.10 a pop, in the TO-3 case, no less. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html
From: Jim Thompson on 8 Aug 2006 17:57 On Tue, 08 Aug 2006 14:48:15 -0700, Tim Wescott <tim(a)seemywebsite.com> wrote: >Jim Thompson wrote: >> On Tue, 08 Aug 2006 21:19:21 GMT, "ian field" <dai.ode(a)ntlworld.com> >> wrote: >> >> >>>"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote in >>>message news:99uhd21d83biuj4122hfrv1p47k4gip41h(a)4ax.com... >>> >>>>On Tue, 8 Aug 2006 13:44:27 -0700, "RST Engineering \(jw\)" >>>><jim(a)rstengineering.com> wrote: >>>> >>>> >>>>>What primitive semiconductors did you use in the output stage, or was it a >>>>>toob device? Did we have 2N3055s in '75? I don't memember. >>>>> >>>>>Jim >>>>> >>>> >>>>[snip] >>>> >>>>I'm trying to remember what semiconductors I used. But, IIRC, >>>>2N3055's *were* available around that time. >>>> >>>> ...Jim Thompson >>> >>>Was it Ge or Si ? >>> >> >> >> It was Silicon. I didn't use any Germanium power devices since I >> boosted my car radio back when I was a junior in high school. >> >> ...Jim Thompson > >Correction: it _is_ silicon. >http://www.onsemi.com/pub/Collateral/2N3055-D.PDF. > >Digi-Key has them for $2.10 a pop, in the TO-3 case, no less. I said it was silicon. The Ge device I used in HS was a Delco doorknob power device. I did 10W class-A ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: John Woodgate on 8 Aug 2006 17:53 In message <Uf7Cg.6098$vl5.3392(a)newsfe4-win.ntli.net>, dated Tue, 8 Aug 2006, ian field <dai.ode(a)ntlworld.com> writes >You can't beat a microwave oven transformer with a secondary >transplant! That depends on how the leakage inductance is produced, and whether you can remove it, which you must in order to use it as a conventional transformer -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
From: John Perry on 8 Aug 2006 18:24
Jim Thompson wrote: > On Tue, 8 Aug 2006 13:44:27 -0700, "RST Engineering \(jw\)" > <jim(a)rstengineering.com> wrote: > >> What primitive semiconductors did you use in the output stage, or was it a >> toob device? Did we have 2N3055s in '75? I don't memember. >> >> Jim >> > [snip] > > I'm trying to remember what semiconductors I used. But, IIRC, > 2N3055's *were* available around that time. > They were, and were already pretty cheap. I used them at work in a big current regulator in '74 or '75. John Perry |