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Old 24th August 2005, 07:54 PM   #11
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Quote:
Originally posted by carlmart
[snip]Bottom line: it's important to see if the heatsink metal close to the part is about the same temperature as the part itself, to see if the heat transfer is being properly done.

Carlos

Yes, that's a very good tip! But beware: for a plastic part, like TO220, the exposed top may be much hotter than the metal tab connected to the heatsink, even if the mechanical connection is good.

Jan Didden
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Old 24th August 2005, 09:20 PM   #12
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Quote:
Originally posted by crissty
Please..... I need schem for SMPS type.
If you check around you'll see no good DIY SMPS projects. Why? Much development is needed and also special parts. I'm afraid but this you'll have to forget unless you have the capacity yourself in designing.
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Old 25th August 2005, 08:05 AM   #13
crissty is offline crissty  Greenland
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Linear regulators are very inefficient, and would heat more that the amplifer itself

SO...............
Here's my plan fo regulated high current & voltage regulator
using PWM Chip and using IR2110 + Nchannel Mosfets for Pos & neg voltage regulation.

I need to know exact operation and connections using the IR2110.

Would try to scetch it on a paper first.
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Old 25th August 2005, 09:30 AM   #14
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Quote:
Originally posted by crissty
Linear regulators are very inefficient, and would heat more that the amplifer itself

SO...............
Here's my plan fo regulated high current & voltage regulator
using PWM Chip and using IR2110 + Nchannel Mosfets for Pos & neg voltage regulation.

I need to know exact operation and connections using the IR2110.

Would try to scetch it on a paper first.

I have to join P-A to warn you. if you cannot even get the basic connections yourself, chances of succes are no more than -60dB. Not to discourage you, just to make sure you know what you are getting yourself into.
There is MUCH more in the successful development of a SMPS than is shown in the schematioc.

Jan Didden
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Old 25th August 2005, 10:28 AM   #15
crissty is offline crissty  Greenland
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Jan Didden,
I hope you also had a time when you learnt about what is MOSFET DRIVER.

Now is the time for me to learn this.

But one has to learn something sometime, might be it would take some time to get over it, especially if people like you all would support and help, new ideas would be fullfilled.

Do you think the idea i have thought is wrong, and is not possible.
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Old 25th August 2005, 10:36 AM   #16
crissty is offline crissty  Greenland
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Quote:
If you check around you'll see no good DIY SMPS projects. Why? Much development is needed and also special parts. I'm afraid but this you'll have to forget unless you have the capacity yourself in designing.
peranders,
Its all about Improvements, so keep on improving

That is what we can do here, with each others ideas & experiences.

Some good circuit design for motor controller would serve as a regulator, with some additional circuit (like error correction etc...)

Correct me if I am wrong.
Any comments.......
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Old 25th August 2005, 11:04 AM   #17
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Quote:
Originally posted by crissty
Jan Didden,
I hope you also had a time when you learnt about what is MOSFET DRIVER.

Now is the time for me to learn this.

But one has to learn something sometime, might be it would take some time to get over it, especially if people like you all would support and help, new ideas would be fullfilled.

Do you think the idea i have thought is wrong, and is not possible.

No, your idea is a good one. And I really respect you for having the motivation and guts to attack such a project. If you bring it to a successful end, you will have learned immensely and you'll feel pretty good . It's the only way to learn, but I just wanted you to realise what you are getting into.

Jan Didden
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Old 25th August 2005, 11:54 AM   #18
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If you have 50 VDC and want to take it down to 35-40 volts, it may be done. I'll guess you have to poke around at Maxim or Linear Tech to find some suitable IC but when you are ready and have two good working switching regulators including necessary filters, I'll suspect that it would have been easier and cheaper to change the transformer to 2 x 24 V or 2 x 28 VAC.
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Old 27th August 2005, 06:52 AM   #19
Arius is offline Arius  United States
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As P-A said, research the switch mode controller offerings of the common vendors - National Semi and Linear Tech. Nat Semi, has on their site, a feature where you plug in your desired Vin, Vout, Iout and it recommends some devices for you.

The downside is that there's no negative switcher. You could do what the LT1085 fanatics do and use floating grounds with two positive switchers.

Since you have the willingness to experiment, please do so. It's fun to learn about output switching artifacts, output filter design, poor output impedance over freq, etc and how they affect audio quality.

Alternatively, you could try the easy way out. Use off-the-shelf 48Vin brick type switchers. They are cheap, compact, well documented and tweakable to get your desired Vout. Oh, they're fully protected and probably perform better than any home brew switcher.

Yet another option is to go hybrid between the two approaches. Use linear regulators but with a switching tracking pre-regulator. You get high efficiency (but not as great as a pure switcher) and low noise. Now that'll be fun.
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Old 27th August 2005, 04:13 PM   #20
sr2002 is offline sr2002  India
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but why do u want a regulated supply?

gainclones are usaully best suited with unregualted snubberised psu's.

and second thing if ur using lm3886 isnt 100va toooooooo low.

i mean your bass will be cut down.

and i wouldnt suggest using +/- 35v. use 25-30v so that the amp is flexible to different speaker loads.

if sometime u want to use a 6ohm speaker the amp will get all sweaty.


are u building a mono amp? for wat aplication are u using it?
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