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Old 20th November 2005, 06:53 PM   #1
Padel is offline Padel  Greece
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Default I need advise for three channel Parallel LM4780 project.

Hi all,

I'm building two, three chanells amplifiers based on parallel LM4780 chips for my three way speakers.

Just completed the amplifier and power supply boards, I choose high capacitance (10000uF) for the bass amplifiers and low capacitance (1000uF) for the mid and tremble amplifiers. Each amplifier module has its own Power supply PCB.

I still need enclosures and power transormers.
Sound wise, is there any good reason not to use a single transformer (24v+24v secondaries @ 1000VA) to supply all three PS modules and amplifiers?

Is it better to use different secondaries (i.e. 24v+24v+24v+24v+24v+24v @ 1000VA) for each module and even better to use different transformers?

Regards
P
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Old 20th November 2005, 06:55 PM   #2
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I would go for two traffos, one driving the woofers, and the other the mids and highs.
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Old 20th November 2005, 06:58 PM   #3
Padel is offline Padel  Greece
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Quote:
Originally posted by pinkmouse
I would go for two traffos, one driving the woofers, and the other the mids and highs.

Is this going to be better than multiple secondaries?
Thanks for the reply.

P
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Old 21st November 2005, 03:07 PM   #4
Padel is offline Padel  Greece
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Anyone???
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Old 21st November 2005, 03:49 PM   #5
UrSv is offline UrSv  Sweden
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I would go for the big transformer but run separate bridges.
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Old 21st November 2005, 10:39 PM   #6
Padel is offline Padel  Greece
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Quote:
Originally posted by UrSv
I would go for the big transformer but run separate bridges.

This what I'm thinking, but would I have the full advantages of tri-amp this way?


Regards
P
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Old 21st November 2005, 10:53 PM   #7
moamps is offline moamps  Croatia
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My vote goes to:

two monoblocks,
two transformers in a each monoblock; bass + mid/high.

Regards,
Milan
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Old 21st November 2005, 11:07 PM   #8
Padel is offline Padel  Greece
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Quote:
Originally posted by moamps
My vote goes to:

two monoblocks,
two transformers in a each monoblock; bass + mid/high.

Regards,
Milan
It is two monoblocks, three channels each.

P
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Old 21st November 2005, 11:27 PM   #9
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Default Re: I need advise for three channel Parallel LM4780 project.

Quote:
Originally posted by Padel
Is it better to use different secondaries (i.e. 24v+24v+24v+24v+24v+24v @ 1000VA) for each module and even better to use different transformers?
Different secondaries is better.
Even better is separate transformer for each drive unit/amp/channel.
That would give you two trafos (one per channer) with 6 24V secondaries each, or (even better) 6 trafos with 2x24V each.
As you already have independent PSUs for each amp, it's just a question of trafos.
And that depend$ on how much you wanna $pend.

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