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Old 10th September 2008, 04:25 PM   #51
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I just wanted to report that I have successfully replaced the 33078/9 with LME49720/40 on my 200ASC boards and they still work.

Does anyone know where the "DC blocking" takes place? Is this some kind of active circuit I'm ignorant of, or are one of the many small ceramics responsible?
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Old 10th September 2008, 04:49 PM   #52
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Aint it just caps on the input or between input opamp stages ?
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Old 10th September 2008, 05:09 PM   #53
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Quote:
Originally posted by Tekko
Aint it just caps on the input or between input opamp stages ?
Besides the few PS filtering caps all the other caps are ceramics, so that would mean ceramic DC blocking caps.

It's too hard for me to trace out a multi-layer board like this; makes me dizzy.
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Old 10th September 2008, 05:37 PM   #54
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Default 500ASP

We make powered loudspeakers and we have been using the 1000A, 500A, 200ASC and 500ASP quite successfully since 2001. We are very happy with the reliability and sound quality as are our customers.

We are fully aware of the limitations as well as the pluses of the ICE Power modules. Yes, with sine wave testing you cannot use the amplifiers at full power at 20KHz. But music does not have levels at 20KHz that high. With music there are no limitations.

Dan
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Old 10th September 2008, 09:18 PM   #55
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Quote:
I just wanted to report that I have successfully replaced the 33078/9 with LME49720/40 on my 200ASC boards and they still work.
Thanks for the report. I may get brave and try it myself (wish I had bought spares when the modules were cheaper....). Was the change worth it?
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Old 11th September 2008, 03:58 AM   #56
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Quote:
Originally posted by bwaslo
Thanks for the report. I may get brave and try it myself (wish I had bought spares when the modules were cheaper....). Was the change worth it?
Worth what? It took 10 minutes and didn't cost me a dime.

Seriously though, I have no idea. This was one of those "I did it because I could" mods. They still sound great, but I didn't bother with a before and after comparison.
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Old 11th September 2008, 05:25 AM   #57
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I was looking at the boards a few weeks back and i think the dc blocking caps are right at the beginning of the terminal block.
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Old 11th September 2008, 05:40 AM   #58
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I thought those might be it too, but if you look at the block diagram in the 200ASC datasheet it shows the "DC blocking" comes after the input buffer.

The ceramics by the inputs might just be for RF filtering. I will have to probe around a bit and see if one side of the cap is connected to ground.
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Old 11th September 2008, 01:58 PM   #59
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OK, I did my prodding and found that the two ceramics right by the input pins are not for DC blocking. They connect to the input pins through 1K resistors and their other end connects to ground through a common 1R resistor.

The hunt continues......
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Old 11th September 2008, 06:36 PM   #60
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Is it possible that the 33078 is part of a servo circuit? Maybe this is the DC blocking stage? I can trace one part of the 33078 circuit directly to the speaker output.
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