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Old 5th December 2006, 11:55 AM   #31
dj_zibi is offline dj_zibi  Poland
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I changed PCB pinkmouse. PCB is universal. It works stereo and parallel.
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Old 6th December 2006, 02:34 AM   #32
palesha is offline palesha  India
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How about schematics?
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Old 6th December 2006, 06:52 PM   #33
dj_zibi is offline dj_zibi  Poland
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Schemaik is on WWW Peter Daniel. Schematik is universal. PCB is active in stereo and parallel.
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Old 6th December 2006, 09:03 PM   #34
veteran is offline veteran  Poland
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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.
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Old 7th December 2006, 12:55 AM   #35
palesha is offline palesha  India
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Thank u very much
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Old 7th December 2006, 02:30 AM   #36
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Anyone figured out what the values of the components need to be? It would be great if someone could! Thanks!
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Old 7th December 2006, 05:11 AM   #37
PierreG is online now PierreG  Canada
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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?
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Old 7th December 2006, 05:33 AM   #38
veteran is offline veteran  Poland
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It doesn't matter. Parallel amplifier can drive low impedance loads (4R is not a problem).
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Old 7th December 2006, 07:21 AM   #39
VLSI is offline VLSI  Australia
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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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Old 7th December 2006, 09:42 AM   #40
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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.
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