Omit the filament windings -- LTM8033 from Linear - diyAudio
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Old 15th February 2011, 09:33 PM   #1
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Default Omit the filament windings -- LTM8033 from Linear

I saw this in a recent email from Linear Tech -- the LMT8033 is a buck converter module 3.6 to 36Vin, 0.8 to 24V out @3.6A-- very low radiated noise. Adjustable per usual:

http://cds.linear.com/docs/Datasheet/8033f.pdf
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Old 15th February 2011, 09:53 PM   #2
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ah yes- complete with a table outlining componet values for various voltages. The are really making it easy. Thanks Jackinni - many uses I say.
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Old 15th February 2011, 10:02 PM   #3
tomchr is offline tomchr  United States
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Yeah..... Good luck soldering that one.

~Tom
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Old 15th February 2011, 10:30 PM   #4
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Yeah..... Good luck soldering that one.
Nothing a simple groupbuy could not fix. . Presoldered to some pcb...et voila.

Forgive me though for asking this. But what are the advantages of such a thing? Can it output ac in high freqs?

Or is it more suitable for the preamps in vogue now where you can plug and play dht's with all kinds of filament voltages?
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Old 15th February 2011, 10:31 PM   #5
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http://focus.ti.com/lit/ds/symlink/tps5450.pdf
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Old 15th February 2011, 11:11 PM   #6
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Originally Posted by tomchr View Post
Yeah..... Good luck soldering that one.

~Tom
Yea I know what your mean. And you have a good point. However I could do it. Hot air is the trick.
I think that Jackinni's idea for a fix when filament windings are not avaiable, or not able to produce enough current is the obvious first idea. Anywhere that you need a higher voltage DC from a lower one. I wonder if you could put two back to back and get + and - for a solid state amp? If someone wants to lay out a board and have it built, I will install the parts properly no cost to anyone on the forum. Send me 10 I'll knock it then in one sitting.

Last edited by firechief; 15th February 2011 at 11:23 PM.
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Old 15th February 2011, 11:57 PM   #7
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Yes, if you take a look at some of SY's designs using the LM317 as a filament regulator, then lifting the filament well above ground for a cathode follower, use this module instead. The switching frequency is in the 100's of kHz.

Bas, if you think it's appropriate for a GB, any number of folks could have them burned and assembled at 6.3VDC, 12.6VDC etc for mounting on a couple of molex 0.100" headers.
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Old 16th February 2011, 12:00 AM   #8
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Ken Thats a cool part too. Needs and inductor, but thats not too hard. The first part needs only 2 resistors and 3 caps. I hope this is not a solution looking for a problem in DIY.
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Old 16th February 2011, 12:17 AM   #9
tomchr is offline tomchr  United States
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Originally Posted by firechief View Post
Yea I know what your mean. And you have a good point. However I could do it. Hot air is the trick.
I've soldered SMDs with exposed DAP and such with a heatgun. It works alright. I also have access to a METCAL hot air reflow station at work. I *can* do the work. But why? The LMZ-series of SimpleSwitchers from National are way easier to work with. A couple of passives and you're set. Check out the LMZ12003 for example. Or LMZ14203. Easy to solder too. What's not to like?

~Tom
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Old 16th February 2011, 12:42 AM   #10
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Yep - Those packages are pretty user friendly. 3 resistors and 4 caps. Like 8 parts plus a board and some headers. I wonder how much intrest there realy is?
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