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Old 13th February 2003, 07:18 PM   #11
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Default PCB for active crossover

Have a look at www.linkwitzlab.com for pcb's theory and schematics.

Regards,

Jarno.
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Old 14th February 2003, 04:11 AM   #12
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Default PCB

I checked linkwitzlab.com, and indeed, the documents are very helpful to understanding the theory of active crossovers. However, I couldn't find any PCB image for download. I can etch copper clad boards to make PCBs, but cannot design the PCBs. A link to a free download would be greatly appreciated. Thanks.
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Old 14th February 2003, 05:32 AM   #13
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Quote:
Pity BB does not include their OPA512 in their sample program, which is TO3 and goes up to +/-50v, probably delivering close to 100W. Looks like an LM12 version.
Ouch!!! Just looked up the price of a OPA512!!!

So much for building a 'cheap' amp........
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Old 14th February 2003, 05:36 AM   #14
halojoy is offline halojoy  Sweden
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Thumbs up OPA549

Quote:
Originally posted by ANTHONY2181
Hi has any one experimented with the opa549 power op amp from Burr Brown? Anthony
An interesting IC - powerful! 10A peak. 8A continuosly.
Max Voltage = plus/minus 30Vdc

opa549.pdf (315 KB,Rev.C) (Updated: 08/08/2002)
OPA549 Spice Macromodel .zip
----------------------------------------------

OPA549 can drive motors and also be used
as a powerful Ajustable PowerSupply. And power amp.

The picture below shows an appl. from datasheet:
Adjust. 1-25 Volt Output
Adjust. 0-10 Ampere CurrLimit
with 2 potentiometers.
Probably you can use another OPA549 as a Negative PSU
to get a dual supply. plus minus 8 Ampere!

/halo
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Old 14th February 2003, 10:04 AM   #15
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halo,
does national send out samples to best part of sweden? and btw, were is best part of sweden? if its best part of sweden mus be better than here. How far away from the coast and temperature at the moment?
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Old 14th February 2003, 10:21 AM   #16
halojoy is offline halojoy  Sweden
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Talking oh what a lot of difficult questions

Quote:
Originally posted by till
halo,
does national send out samples to best part of sweden? and btw, were is best part of sweden? if its best part of sweden mus be better than here. How far away from the coast and temperature at the moment?
I live in the far north of Sweden, like 65degrees north.
I live some 120km from the Coast of Bothnic Sea.
Right now is -1.5 centigrade below water frezingpoint.

Sun is shining! Very rare this time of winter.
It is all white with snow,
and it is very bright,
when sun shines upon all this whiteness.

National doesn't send anything to me.
I have to order from www.elfa.se

/halo - will watch TV this Friday Night
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Old 14th February 2003, 10:29 AM   #17
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It looks like you become depressive there - is it dark? something wrong with you?

ftp://213.100.118.115/Did%20you%20kn...0to%20die.html
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Old 14th February 2003, 11:51 AM   #18
protos is offline protos  Greece
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I am finishing an OPA549 based power amp.Will report soon.
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Old 14th February 2003, 12:47 PM   #19
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If using speakers with high enough impedace, why OPA549, wouldn´t be 548 better?
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Old 14th February 2003, 06:51 PM   #20
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Quote:
Originally posted by till
If using speakers with high enough impedace, why OPA549, wouldn´t be 548 better?
If you're saying that OPA548 would be better than OPA549, is it because of THD? Would the defference btwn 0.01 and 0.0015% be audible? Just curious. And I see that those THD values were specified at different output powers (70 and 35 Watts).
Well... at the same PS voltage, OPA549 can give more current than OPA548 can. So, "power-wise" I would go with OPA549 especially for the subwoofer project that I'm planning.
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