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Sch3mat1c
Posted: April 03, 2015 08:27 pm
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I've been meaning to make some standard-ish power boards... the larger one is a ~100W capacity, single switch, flyback/forward, based on UC3842 and the bobbins I got for the cores I got from Johansen. smile.gif They're also double-pinned for an EPCOS bobbin available from Digikey/Mouser.

Tim


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Sashi
Posted: April 04, 2015 04:44 am
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Sexy!

These all for personal projects or you plan on selling them?


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Sch3mat1c
Posted: April 04, 2015 06:46 am
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I'll have at least a few extra to hand out.. can't think of more than five or ten voltages to make, even with multiples.

Tim


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Ice-Tea
Posted: April 04, 2015 07:52 am
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Good looking'

You plan to blow up a few, right? Make sure you got pics of that too!
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kellys_eye
Posted: April 04, 2015 10:30 am
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mmmmmm, geek p0rn tongue.gif

I'd be sat 'shuffling' the deck with that pile of boards! There's just something about naked pcb's that excite........ or is there something wrong with me laugh.gif (come on Larry - your turn laugh.gif )

Wouldn't one 'variable' version have done the job?



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CWB
Posted: April 04, 2015 02:47 pm
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"Wouldn't one 'variable' version have done the job?"
basically , this is what would be known as a "switch hitter" ...
and i don't mean someone that bats right and left handed .

juuussst be careful of the edges , that fiberglass can really tear up skin .

yeah ... the boards do look good .
i dunno , you might debug a series of them and put them up on sneezebay in kit form .
schools that have an electronic votech type curriculum might be interested in them .


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Sch3mat1c
Posted: April 04, 2015 06:03 pm
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Switcher hitter* wink.gif

The edges are all routed, and the corners are gently rounded too! So the edges are sharp where the soldermask is cut flat, but no fiberglass hanging out. A touch with some wet-or-dry would knock that right down. I think protos aren't usually V-grooved (which leaves a nasty broken fiberglass edge) because they load a panel with everything they have to produce.

One variable version wouldn't do the job, because it's hard to make more than an, oh, 2:1 variable range on this sort of design -- and it takes better components (or less maximum power capacity for the same components) to get a wider range, when it is so equipped.

First one I'm building: 6.3V 10A. Second one: 200V 0.5A. Third, I'm thinking 18-36V, 3-4A. After that, whatever else I need...

Tim


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kellys_eye
Posted: April 04, 2015 08:41 pm
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I recall posting details of a variable SMPS for Tekwiz (remember him? laugh.gif ) that was rated at 100W. IIRC it could do 0-50V (or was it 0-100V???).

Someone with search-fu cold drag the post up I suppose???? (Mac tongue.gif )

<edit> turns out is wasn't SMPS as such but based on the CuK technology - Trademark of the TESLA company as it turns out..... </edit>


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MacFromOK
Posted: April 04, 2015 10:37 pm
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QUOTE (kellys_eye @ April 04, 2015 02:41 pm)
I recall posting details of a variable SMPS for Tekwiz (remember him?  laugh.gif ) that was rated at 100W.  IIRC it could do 0-50V (or was it 0-100V???).

Someone with search-fu cold drag the post up I suppose???? (Mac  tongue.gif )

Well, yer partly right... biggrin.gif

However... it appears you didn't post it, but offered to scan/email it to both tekwiz and blackman. beer.gif

http://www.dutchforce.com/~eforum/index.php?showtopic=15630


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kellys_eye
Posted: April 05, 2015 12:58 am
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Yup, that's the one - thanks Mac. Don't know know you do it but I appreciate it!

Anyway, here's the schemmy of the 0-100V, 0-5A PSU. I have the full article in pdf if anyone's interested.

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