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Old 16th February 2010, 07:50 AM   #21
luka is offline luka  Slovenia
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oh no, its know core, just BIG one, so I can have low freq, so that I max out 1mm wires on it... it has 6 turn primary and 20 some on secondary...its unregulated, just voltage limited... don't want to kill IC on amps

I would normaly go higher with freq. but since core is 63mmOD/36mmIN and 25mm high, with a lot of wire for primary and secondary, I have pretty damn rock hard output voltage, I only tested it for about 300w or so, since my moded PC supply wasn't to happy with 25A+ for any long period of time
Only battery could give me more, but that will be in car, since I don't really care how strong supply is, as long as it can hold voltage up for the amps to blast, that's fine by me
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Old 16th February 2010, 10:42 AM   #22
v-bro is offline v-bro  Netherlands
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But what core material is it? The value and performance is not only related to size.

Yes, my lab supply couldn't keep up either! I had to get my 40A 12V supply out!
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Old 16th February 2010, 12:48 PM   #23
luka is offline luka  Slovenia
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its 35G, from iskra feriti, slovenija, my home city, and 35G = epcos N87 and near match to ferroxcube 3F3

Maybe this will tell you more

http://www.classdaudio.co.cc/doc/Iskra/35G.pdf
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Old 16th February 2010, 01:17 PM   #24
v-bro is offline v-bro  Netherlands
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Ah okay, that explains a lot, thanks!
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Old 2nd March 2010, 01:42 PM   #25
luka is offline luka  Slovenia
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Default Almost there

Yep yep, I am almost done, everything fine so far, here are few pictures

Click the image to open in full size.Click the image to open in full size.

Click the image to open in full size.

oh and yes, its going to be controlled by microcontroller
Now I am waiting for PICKIT 2 to be available, I have already learned and done program for pic12f675, just need to program it and put is somewhere
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Last edited by luka; 2nd March 2010 at 01:46 PM.
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Old 24th May 2010, 06:08 PM   #26
luka is offline luka  Slovenia
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Ok so, since I have already posted picture of heatsink (part of case) here, all end it also here. So today I finished wiring all of the amp, minus the output from amp's to case output terminals, I'll do that soon.. Amp's are both working, PIC is doing its job, and man, do they have some nasty power to give and all this was with current limited 130w supply, this should be insane in car with say, 80A fuse
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Old 24th May 2010, 06:13 PM   #27
savu is offline savu  Romania
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Nice work Luka ...

Congrats on the SMPS looks nice.

Regards,
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Old 24th May 2010, 08:07 PM   #28
v-bro is offline v-bro  Netherlands
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I designed my own board now, or actually, me and a friend did...
Attached Images
File Type: jpg P1010176b.JPG (56.7 KB, 217 views)
Attached Files
File Type: pdf PCB Powerboard small SILK.pdf (181.3 KB, 70 views)
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Old 26th May 2010, 04:19 PM   #29
luka is offline luka  Slovenia
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Ok so... I got 3 pictures, not the best I could take, but will have to do for now, since camera died on me (is in process of ...)

If somebody will want more, I try to find some other way of taking picture...

Click the image to open in full size.
Taken from power and output side

Click the image to open in full size.
From the side...

Click the image to open in full size.
Output...

There are some changes that will come at a later date, but now itsmore of a test time, see what everything works every single time, for now it is...
Still need to put(and change) heatsink on driver IC's and I'll probably change from resistive load to get some min duty cycle from smps, to HV buck converters, that will have power from output of smps, so that there won't be heat dissapated in resistor network
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Old 6th June 2011, 03:22 AM   #30
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Hey Luka. Do you have the schematic for the transformer/power supply? Can I use your design but use a different amount of windings to get something like +/- 30V?

Looks great!
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