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Old 22nd May 2007, 12:39 PM   #11
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Click the image to open in full size.
heres the supply


Click the image to open in full size.
this is the output wave of the toroidal when loaded down
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Old 22nd May 2007, 01:16 PM   #12
sek is offline sek  Germany
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Hey guitar_joe,

a stable output waveform on a prototype is a good thing! Congratulations...

As for the spikes and rounded edges of the output, this will likely change with faster diodes, preferrably ultra-fast/soft-recovery.

Rod Elliot implements 'snubbers' on the primary as R1/R2 and C1/C2, respectively. On the secondary he puts C7/C10 for HF rejection.

But as no two handmade toroids are the same, I recommend you re-calculate these snubbers, as they will have unneccessary power loss (and low influence on filtering) when set for a different MOSFET/toroid/diode arrangement.

Jim Hagerman wrote a very comprehensive paper about it.

Cheers,
Sebastian.
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Old 22nd May 2007, 05:12 PM   #13
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Can you post the schematic that you use to get +63v/-63v dc
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Old 10th August 2007, 03:18 AM   #14
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Been ages since i posted on this thread. Finished building it and it works great.

Using a bunch of to220 dual diode schottkys for the rectifiers getting +/- 30 dc. Good project, learnt a bit about smps building this
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Old 11th August 2007, 01:10 PM   #15
twon007 is offline twon007  United States
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iwould love to get into something like this. premature in the luikes of electtronics design etc. have access to some equipment cheap. any suggestions as to a project to start out with>? novice,remember? and i will do the research as to what i should get for tools.
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Old 14th August 2007, 10:58 PM   #16
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All u need is a multimeter, a high current 12v supply and or a car battery - WITH A FUSE lol. a scope is pretty essential too.
I read the esp doc project 89 and learnt heaps on it.
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Old 15th August 2007, 10:40 AM   #17
twon007 is offline twon007  United States
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thanks guitar joe. i just want to build something that i can call my own. not the same as fixing something. your just fixing something that someone else made. p.s. what do you mean you say scope?
already have dmm small soldering gun and can always get a battery
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