How to parallel multiple power amps? - Page 2

kokoriantz · 25th November 2020, 12:04 PM

How to parallel multiple power amps?-tow-lm-jpg

This is the transient response of the multiplier driven by main LM1875. It is not perfection but very stable.

kokoriantz · 01:23 PM

Discard the precedant post, wrong circuit.

How to parallel multiple power amps?-2lm-jpg

kokoriantz · 25th November 2020, 02:00 PM

Quote:

Originally Posted by AKSA

Hayk,

Is this needed? Rowlands has marketed amps with multiple chips, at high cost, and others had done this with HP amps too.

HD

FauxFrench tried to parallel bridge triple pair, it is so difficult to adjust the offset and the gain precisely on each six amplifiers. So I decided to take over his project but in my way. Frankly, I am very glade, as I created two new circuits.

anchorman · 25th November 2020, 02:18 PM

Pluto electronics

Linkwitz paralleled two IC power amps for the woofer amp on his Pluto speakers. Schematic is in the post I linked if you scroll down. Look at the literature for the chip he was using, and maybe there is some more helpful information?

kokoriantz · 03:18 PM

It is also possible to adjust the stability to perfection by adding an inductance to the main's resistance L2 of 100nH. This inductance can be realized by not using non inductive resistor and/or looping the leads single turn. Bellow is without and with. The scale is 50ns.

no inductor.JPG with 100nH.JPG

kokoriantz · 25th November 2020, 03:22 PM

Quote:

Originally Posted by anchorman

Pluto electronics

Linkwitz paralleled two IC power amps for the woofer amp on his Pluto speakers. Schematic is in the post I linked if you scroll down. Look at the literature for the chip he was using, and maybe there is some more helpful information?

It looks to be bridged, not paralleled. Thanks for showing there are interesting things.

kokoriantz · 25th November 2020, 04:00 PM

square.jpg
This is 10khz square wave, What the people want better?
Why I have bad face on the thread? Should I stop here?

geraldfryjr · 05:30 PM

Every one of those output gain stages should each have their own DCservo amp on them.

See this thread .....

BPA-200 servo problem

jer

kokoriantz · 25th November 2020, 07:55 PM

How to parallel multiple power amps?-bad-jpg

Why?
Why?
Why?
Why?

chermann · 25th November 2020, 08:54 PM

the first post i done by you and you can change the first post.
in advanced mode you can put away the sad smile

25th November 2020, 03:15 PM	#15
kokoriantz diyAudio Member Join Date: Dec 2015 Location: south east asia	It is also possible to adjust the stability to perfection by adding an inductance to the main's resistance L2 of 100nH. This inductance can be realized by not using non inductive resistor and/or looping the leads single turn. Bellow is without and with. The scale is 50ns. no inductor.JPG with 100nH.JPG Last edited by kokoriantz; 25th November 2020 at 03:18 PM.

25th November 2020, 05:28 PM	#18
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	Every one of those output gain stages should each have their own DCservo amp on them. See this thread ..... BPA-200 servo problem jer Last edited by geraldfryjr; 25th November 2020 at 05:30 PM.

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25th November 2020, 02:18 PM	#14
anchorman diyAudio Member Join Date: Sep 2009	Pluto electronics Linkwitz paralleled two IC power amps for the woofer amp on his Pluto speakers. Schematic is in the post I linked if you scroll down. Look at the literature for the chip he was using, and maybe there is some more helpful information?

25th November 2020, 04:00 PM	#17
kokoriantz diyAudio Member Join Date: Dec 2015 Location: south east asia	square.jpg This is 10khz square wave, What the people want better? Why I have bad face on the thread? Should I stop here?

25th November 2020, 08:54 PM	#20
chermann diyAudio Member Join Date: Jan 2017 Location: Vienna	the first post i done by you and you can change the first post. in advanced mode you can put away the sad smile