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Old 19th August 2008, 08:25 PM   #21
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Little mistake in the smps schematics

with these zener diodes voltage, Opto led should be connected between +50v and 0V at the output and not between +50 and -50 v as it is stated
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Old 20th August 2008, 12:27 AM   #22
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Quote:
Originally posted by alexclaire
Little mistake in the smps schematics

with these zener diodes voltage, Opto led should be connected between +50v and 0V at the output and not between +50 and -50 v as it is stated
I believe the intent was to "monitor both sides", but I agree with you - the zener voltages need to be changed accordingly.
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Old 20th August 2008, 04:12 AM   #23
LuigiDJ is offline LuigiDJ  Colombia
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Hi wine&dine, thank you, thought of that trick too, just wanted to make sure. What i'm not sure is: is still connected the same way the 310V and float points? Right now I'm reading the Marty Brown book (power supply cookbook), and will begin to calculate for my needs.

How about the feedback network? It's necessary to track both sides or just one of them?

Still reading...

Luigi
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Old 31st August 2008, 07:51 PM   #24
alex mm is offline alex mm  Europe
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Default PCB for SMPS +/-50V

Hi folks.

Another PCB variant http://freepdfhosting.com/3bb9b920ad.pdf not tested , but I hope to be good all the best alex mm
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Old 4th September 2008, 08:02 AM   #25
h_a is offline h_a  Europe
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Very nice! A SMPS for audio amps!

Unfortunately I don't have much understandings of a SMPS, but I'm interested in using one for a power amp.

Looking at the schematic I've the impression that one would just need to change the windings ratio on the transformer connecting the switching part to the outside world (the ETD59 core).

And as always I'm sure it's not as easy as that, so it would be great if somebody could point me to information about doing that - say I'm interested in +/- 25V rails?

By the way, what's the max output current of that SMPS?

Have fun, Hannes

PS: yes I'm scared by lethal voltages.
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Old 4th September 2008, 08:52 AM   #26
luka is offline luka  Slovenia
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Quote:
Originally posted by h_a
Very nice! A SMPS for audio amps!
By the way, what's the max output current of that SMPS?
in theory there is none, in real life, is as much as parts can handle and depend on them


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Old 4th September 2008, 08:55 AM   #27
h_a is offline h_a  Europe
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Thanks for the reply, but I would be interested in the max output current for the parts used in the schematic!

Have fun, Hannes
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Old 4th September 2008, 09:00 AM   #28
luka is offline luka  Slovenia
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Hi

How much would you need?
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Old 4th September 2008, 09:29 AM   #29
h_a is offline h_a  Europe
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10 A peak would be nice; of course I would use a regulator after the SMPS which can handle 8A.

The reason for the low rails (+/-25V) is the balanced topology, so in fact the speaker sees +/- 50 V maximum.

Have fun, Hannes

By the way, Ljubljana is a very nice city! Been there often, especially in Krizanke.
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Old 4th September 2008, 09:34 AM   #30
luka is offline luka  Slovenia
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Hi

You don't need regulators, as you can make it regulated suppy..I think it can do this, probably first liniting component is too small trafo, but you should have problems with that. Other is somewhat correct winding of trafo...anything else is easy, really easy. Chech my site to get some idea what to expect or need, maybe you will find something useful
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