LM4780 SS Pcb - Page 4

dj_zibi · 5th December 2006, 11:55 AM

I changed PCB pinkmouse. PCB is universal. It works stereo and parallel.

palesha · 6th December 2006, 02:34 AM

How about schematics?

dj_zibi · 6th December 2006, 06:52 PM

Schemaik is on WWW Peter Daniel. Schematik is universal. PCB is active in stereo and parallel.

veteran · 6th December 2006, 09:03 PM

You can use this one Palesha:
LM4780 amp sch
they are all standard LM4780 applications. If you want to use this amplifier in parallel mode - 0.1% resistors are needed. I prefer 47k/2k in feedback and active stage in front of it.

palesha · 7th December 2006, 12:55 AM

Thank u very much

DJ Exprice · 7th December 2006, 02:30 AM

Anyone figured out what the values of the components need to be? It would be great if someone could! Thanks!

PierreG · 7th December 2006, 05:11 AM

Quote:

Originally posted by veteran
You can use this one Palesha:
LM4780 amp sch
they are all standard LM4780 applications. If you want to use this amplifier in parallel mode - 0.1% resistors are needed. I prefer 47k/2k in feedback and active stage in front of it.

Is 120 Watts on your schematic for 8 or 4 Ohm?

veteran · 7th December 2006, 05:33 AM

It doesn't matter. Parallel amplifier can drive low impedance loads (4R is not a problem).

VLSI · 7th December 2006, 07:21 AM

I just use 5% resistors and trim the value of the 1K resistor on the channel with the highest gain by measuring the differential at the output,.
At say 15v RMS output I usually can get the differential to within 5-10mv with standard value resistor.
If your trust your DVM, Test this from 20 to 20khz.
I haven’t tried this but maybe a tiny 8ohm speaker between the outputs in the 1-8khz region you may be able to hear the differential?

pinkmouse · 7th December 2006, 09:42 AM

Quote:

Originally posted by DJ Exprice
Anyone figured out what the values of the components need to be?

As I said earlier, exactly the same as the ones in the datasheet and on Brian's and Peter's websites. Do you read anything?

Well done dj, now let's see some other versions.

6th December 2006, 09:03 PM	#34
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	You can use this one Palesha: LM4780 amp sch they are all standard LM4780 applications. If you want to use this amplifier in parallel mode - 0.1% resistors are needed. I prefer 47k/2k in feedback and active stage in front of it. __________________ Simple audio solutions blog.unisonus.com

7th December 2006, 05:33 AM	#38
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	It doesn't matter. Parallel amplifier can drive low impedance loads (4R is not a problem). __________________ Simple audio solutions blog.unisonus.com

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6th December 2006, 02:34 AM	#32
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	How about schematics?

6th December 2006, 06:52 PM	#33
dj_zibi diyAudio Member Join Date: Mar 2005 Location: Wroc³aw/poland	Schemaik is on WWW Peter Daniel. Schematik is universal. PCB is active in stereo and parallel.

7th December 2006, 12:55 AM	#35
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	Thank u very much

7th December 2006, 02:30 AM	#36
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	Anyone figured out what the values of the components need to be? It would be great if someone could! Thanks!

7th December 2006, 07:21 AM	#39
VLSI diyAudio Member Join Date: Nov 2006	I just use 5% resistors and trim the value of the 1K resistor on the channel with the highest gain by measuring the differential at the output,. At say 15v RMS output I usually can get the differential to within 5-10mv with standard value resistor. If your trust your DVM, Test this from 20 to 20khz. I haven’t tried this but maybe a tiny 8ohm speaker between the outputs in the 1-8khz region you may be able to hear the differential?

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