Building a transformer
in [Design]
|
Prev: Texas Instruments microcontroller
Next: potentiometer
From: John Woodgate on 11 Aug 2006 06:31 In message <44dc500f$0$7951$db0fefd9(a)news.zen.co.uk>, dated Fri, 11 Aug 2006, Mark Fortune <mark(a)fortrex.co.uk> writes >aha, you've discovered one of my planned future hobbies :) >any money in it though? Yes, you'll spend quite a bit. Everybody and his dog makes power amplifiers. Try something else (which is small-signal and thus less likely to emit flames and smoke). For example, low-level active crossovers; 2-way, 3-way, 4-way, Butterworth, Linkwitz-Riley, Bessel, transitional Gaussian, Thiele.... Enough to keep you busy for 50 years. And there isn't a great deal of competition, at sensible prices, so you could sell a few on Ebay. There is other low-level stuff which, compared with power amps, is a doddle to get working if you master the design mathematics. And you only need a +/- 12 V power supply at 10 mA. (;-) -- 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: Jim Thompson on 11 Aug 2006 11:34 On Fri, 11 Aug 2006 11:31:13 +0100, John Woodgate <jmw(a)jmwa.demon.co.uk> wrote: >In message <44dc500f$0$7951$db0fefd9(a)news.zen.co.uk>, dated Fri, 11 Aug >2006, Mark Fortune <mark(a)fortrex.co.uk> writes > >>aha, you've discovered one of my planned future hobbies :) >>any money in it though? > >Yes, you'll spend quite a bit. > >Everybody and his dog makes power amplifiers. Try something else (which >is small-signal and thus less likely to emit flames and smoke). For >example, low-level active crossovers; 2-way, 3-way, 4-way, Butterworth, >Linkwitz-Riley, Bessel, transitional Gaussian, Thiele.... > >Enough to keep you busy for 50 years. And there isn't a great deal of >competition, at sensible prices, so you could sell a few on Ebay. There >is other low-level stuff which, compared with power amps, is a doddle to >get working if you master the design mathematics. > >And you only need a +/- 12 V power supply at 10 mA. (;-) Is there REALLY a market for active crossovers? ...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 11 Aug 2006 12:26 In message <dp8pd2hgs68r05egivopvsardigtfbutrf(a)4ax.com>, dated Fri, 11 Aug 2006, Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> writes >Is there REALLY a market for active crossovers? The industry as a whole is slowly coming round to the realization that some of us have had for a long time, that active crossovers are the only ones that work properly, are extremely cheap and can be designed without a lot of fiddling. The extra amplifiers required are cheaper than the equivalent passive crossover. Besides, do you want to build a 4th/8th-order Linkwitz-Riley 3-way using passive components? (The midrange section is a bandpass filter so has to be 8th-order.) You will also need Zobel networks (accurate ones) for each driver, so as to properly terminate each filter. BIG, costly components. No electrolytic capacitors, of course, because you need +/-5% tolerance or better. -- 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: Bud-- on 11 Aug 2006 13:30 I ran across info on rectifier design up through filtering (but not regulation) at: http://www.ieeta.pt/~alex/docs/ApplicationNotes/Rectifier%20Applications%20Handbook.pdf It is: Rectifier applications handbook - 272 pg - 2MB From a brief scan it looked very good and more than anyone here wants to know about rectifiers, including the physics. A paperback book for transformers: Practical Transformer Design Handbook; Eric Lowdon; published by Howard W Sams; 240 pages; 8x11"; my copy is 1981. It is aimed at experimenters designing single transformers using salvaged cores. I thought it was very good. It may be hard to find, but with the internet who knows. bud--
From: Eeyore on 11 Aug 2006 13:45
"Dave Plowman (News)" wrote: > In article <44db929f$0$31649$db0fefd9(a)news.zen.co.uk>, > Mark Fortune <mark(a)fortrex.co.uk> wrote: > > Thanks to all those that offered their advice however, it's been > > insightful to me, and I certainly wont give up the opportunity to build > > my own transformers in future... just not on such a power crazed level > > where there are better solutions. > > I'd also query the need for such a large bench top supply - unless you're > regularly repairing or building things like power amps. I've never found large bench supplies helpful for designing power amps. Graham |