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Old 14th February 2003, 06:59 PM   #21
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I dont know. If i would, i wouldnt ask. Its more because TI uses OPA548 in the audio amplifier aplication note.
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Old 15th February 2003, 02:49 AM   #22
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it seems there's no pcb image for active crossover available online. Pity...
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Old 16th February 2003, 05:39 AM   #23
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Quote:
Originally posted by protos
I am finishing an OPA549 based power amp.Will report soon.
Protos,
I made a unity gain amp with OPA549, and the thing is.... there's nothing at the output. Do I need to apply some voltage to the "enable" pin? According to the datasheet, the enable pin can be left open for normal use. So, I just left it open. Hmmm.... I must be doing something wrong. BTW, I put 4.7k resistor for the current limit.
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Old 16th February 2003, 07:44 AM   #24
David B is offline David B  United States
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Default PCB's for active crossover

Marchand has both a PCB for $10 and a complete kit.

http://www.marchandelec.com/xm1.htm

Elliot Sound Products has a PCB that can be built as a 2 way linkwitz riley 4th order xover, or a three way version.

http://www.sound.westhost.com/project09.htm
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Old 16th February 2003, 08:53 AM   #25
Bricolo is offline Bricolo  France
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Default Re: PCB's for active crossover

Quote:
Originally posted by David B
Marchand has both a PCB for $10 and a complete kit.

http://www.marchandelec.com/xm1.htm

Elliot Sound Products has a PCB that can be built as a 2 way linkwitz riley 4th order xover, or a three way version.

http://www.sound.westhost.com/project09.htm

active crossover with an opa549??
why do you want an active crossover capable of 10 amps?

are you planning to use only one amp, and multiple high power active XOs?

would be interessting to try, I never heard about this concept
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Old 16th February 2003, 11:27 AM   #26
coffin is offline coffin  Taiwan
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Default Re: PCB for active crossover

Quote:
Originally posted by Jarno
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(ok, so translating taiwanese with a chinese dictionary doesn't work) [/B]
What's the Taiwanese you want to translate?
Coffin from TWN

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Old 16th February 2003, 11:34 AM   #27
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Quote:
Originally posted by till
yeah, and whats very cool is, for germany they need only one or two days also!

Go with it for the subwoofer, will be ok.
I will try out OPA544 next. I dont really need the power. Very cool are those high voltage high current OP amps in TO3 with 8 pins - only i dont know how to mount them on a heatsink - if i drill than many holes there is not much heatsink left for thermal contact.

Yes
Where can I find this Heatsink type ?
I got a OP501AM on hand....

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Old 16th February 2003, 12:17 PM   #28
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have to drill a lot of holes?
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Old 16th February 2003, 02:09 PM   #29
coffin is offline coffin  Taiwan
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Quote:
Originally posted by till
have to drill a lot of holes?
This is one way...

I know some way out there is a TO-3 8 pin IC socket! With heatsink!
Where can I find it?

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Old 16th February 2003, 02:46 PM   #30
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Default Re: Re: PCB's for active crossover

Quote:
Originally posted by Bricolo

active crossover with an opa549??
why do you want an active crossover capable of 10 amps?
are you planning to use only one amp, and multiple high power active XOs?
would be interessting to try, I never heard about this concept
Who on earth would make an active crossover capable of 10 amps? OPA549 is for a subwoofer amp not for an active crossover. I was curious what protos' project was about.
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