I think what you're saying is "try learning on some smaller transformers first" I might just do that, cos it'd be a PITA if I screw up on a big one and have to unwind it all again :]
Thanks for the info, i'll try and get my library to order a copy.
Digi-Key has them for $2.10 a pop, in the TO-3 case, no less.
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Tim Wescott
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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
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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
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| James E.Thompson, P.E. | mens |
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I love to cook with wine. Sometimes I even put it in the food.
I mean, are you really planning on water cooling the maximum 600W you'll dissipate? Heatsinks that size can get pricey. Don't say it won't happen (the full dissipation).
Tim
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Deep Fryer: a very philosophical monk.
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I was only taking issue with your tense -- the 2N3055, while venerable, appears to be in current production. So it's an 'is' part, not a 'was' part.
--
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
Put a search in Ebay and store that page. Keep looking - odd and large transformers come up often, and go for quite reasonable prices. But what you want (roughly) is common on large audio power amps, so shouldn't be difficult to find.
Because of economies of scale buying the materials needed to make one will cost you much more than a factory - and that's without the time and difficulty involved.
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To e-mail, change noise into sound.
Sine wave into equivalent of 4 ohm load... 4 each 16 ohm speakers in parallel... I think... it was 30 years ago, might have been 4 each 8 ohm speakers... 2 ohm equivalent load. All I remember is the 400W ;-)
...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.
Do you need both + and - power at the same time? If not, just have 0-50V would save you half the power. If you need to use 1V at 5A, your power supply would become pretty inefficient (supplying 5W and wasting > 300W). Are you planning to fan cool it? If not you need a huge heat sink.
If you use a switching design, it would be a lot more efficient.
I was just trying to distinguish the number from those that the "music power" types like to bandy around.
For instance peak instantaneous power would be 800W ;-)
...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.
I would need the option of both +v and -v in respect to ground, but only sometimes at the same time (ie when testing audio circuits, but not when doing logic circuits) if I switched one of the secondary windings off... would I still be saving half the power?
Wastage is becoming more apparent as I read more and more posts... and am considering rethinking to a more energy efficient design now.
I was (originally) thinking big heatsink with some thermal controlled fans screwed on.
switching psus I know nothing about, but think I will research this. Any good places to start (apart from the obvious google)?
Well, it's theoretically possible to build a transformer from scratch, BUT! You have to make a bobbin, find a lamination vendor that will sell you only a few hundred lams, assemble the damn thing, hypot it, and test it, to determine that you didn't get the lams tight enough so your leakage inductance is unacceptable, redo it, redo the windings, interleave the lams again, whack it a few times, pot it - - -
After about two weeks of this crap, you might want to go check surplus dealers - they usually have surprisingly good bargains on transformere - sometimes, you can buy them by the pound.
Does nobody knows howto calculate transformers anymore?
this will be a 600Watt transformer
you will need iron of 150mm EEE and III (a standard dimension) a form of 50x54mm
primary: use 1.35mm diameter wire roll 377 spirals
secondary: use wire of 1.77mm diameter (if this does not exist, get the after next in diameter) weld first out line (60v) roll 104 spirals weld second out line (0v) roll 104 spirals weld third out line (60v)
put the irons one by one always alternate positions tight as much as you can the irons dive it into hot varnish and let it dry
this is just the transformer, i guess you will also want to pass AC to DC and maybe a voltage regulator controlled by a variable resistor, but that is another story ;)
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