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Old 13th November 2004, 01:53 PM   #41
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one quick question.

Whats the Option part with the 300 ohm resistors?
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Old 14th November 2004, 02:32 AM   #42
cjd is offline cjd  United States
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Quote:
Originally posted by Evilsizer
ok now got it. I would need three of these to parallel two sets of lm3886's and then bridge the two paralled.

thanks in advance

no... Paralleling two chip-amps requires resistors on the output leg (which isn't necessary on a single non-inverted amp), but no balanced input. Check the National Semi Application note 1192 for more info on paralleling amps.

Or you could pick up some of the BrianGT 4870 amp boards, which are paralleled already. (a 4870 is basically two 3886 on one chip, and his boards parallel them).

C
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Old 14th November 2004, 03:29 AM   #43
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Quote:
Originally posted by cjd



no... Paralleling two chip-amps requires resistors on the output leg (which isn't necessary on a single non-inverted amp), but no balanced input. Check the National Semi Application note 1192 for more info on paralleling amps.

Or you could pick up some of the BrianGT 4870 amp boards, which are paralleled already. (a 4870 is basically two 3886 on one chip, and his boards parallel them).

C

right now im tring to get the jist of things. Yes i do plan on getting brianGT 4870's. Im still working out what i want to use as for as GC's for a 2-way active speaker with active x-o.
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Old 24th November 2004, 02:14 AM   #44
digi01 is offline digi01  China
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the BLD board part list:
DRV134/135 * 1
1uf50V * 4,(C1,C2,C5,C6)those caps that I have used is WIMA MKS2
47uf/35V * 2,(C3,C4)Elna RJH
LM7815,7915/78L15,79L15.the board can mounting to220 or to92L packaged regulator.

hook method below:
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File Type: gif bld hook.gif (7.9 KB, 3386 views)
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Old 24th November 2004, 03:10 AM   #45
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Quote:
Originally posted by digi01
the BLD board part list:
DRV134/135 * 1
1uf50V * 4,(C1,C2,C5,C6)those caps that I have used is WIMA MKS2
47uf/35V * 2,(C3,C4)Elna RJH
LM7815,7915/78L15,79L15.the board can mounting to220 or to92L packaged regulator.

hook method below:

does imput voltage for the board have to be 18v or can it be higher or lower?
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Old 24th November 2004, 03:18 AM   #46
paulb is offline paulb  Canada
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Quote:
Originally posted by Evilsizer

does imput voltage for the board have to be 18v or can it be higher or lower?
The regulators will need at least 18V to operate properly. You can go quite a bit higher, probably +/-30V. If you have less than +/- 18V you should probably build it without the regulators (bypass them instead).
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Old 27th November 2004, 11:50 PM   #47
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What is ment by the "hook method" ???

paulb, what would be the best way to bypass them?

IIRC they don't need much current? Battery powered be an option????......????
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Old 29th November 2004, 12:16 AM   #48
digi01 is offline digi01  China
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Quote:
Originally posted by cdoggy81
What is ment by the "hook method" ???
sorry for my poor english

it mean the method of signal connections and power connections.
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Old 30th November 2004, 05:54 PM   #49
Coulomb is offline Coulomb  England
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I read the entire thread Digi, could not find the price of the BLD module.


Regards

Anthony
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Old 30th November 2004, 06:06 PM   #50
jleaman is offline jleaman  Belgium
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personal quote from digi 22$us for 2 boards : O )shipped

going to order 2 on the weekend.
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