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Old 2nd January 2014, 03:09 AM   #1
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Default IR21844 based amp?

any self-oscillating/UcD amplifier schematics around that use the IR21844?

I have a few of these guys laying around and need to work up a small amplifier module to replace an output module of a subwoofer.

any ideas? Most of the ones I find on the web are based around the IR2010S or 2011. I have the 21844.
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Old 4th January 2014, 05:59 AM   #2
MOER is offline MOER  United States
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Default IRS21844

The chip is too slow for full range class D

Steve Mantz
Zed Audio
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Old 4th January 2014, 08:44 AM   #3
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by MOER View Post
The chip is too slow for full range class D
Not exactly slow , but having a large DT it produces large THD . Something about 0.1%. It will do for a subwoofer.
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Old 4th January 2014, 08:58 AM   #4
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Quote:
Originally Posted by mbates14 View Post
any self-oscillating/UcD amplifier schematics around that use the IR21844?

I have a few of these guys laying around and need to work up a small amplifier module to replace an output module of a subwoofer.

any ideas?
I made several amps based on IRS2184 chip. Look here. ?????? ??????? ?????????? - ????????? ???????? ?????? D - ????? ?? ????????????????. This amp has a combined feedback. It works well only as a sub amp. I also made an amp with second order loop UcD feedback and it sounds well enough in full range mode. I'll post it later here , when I get home to my PC.

Last edited by Dimonis; 4th January 2014 at 09:00 AM.
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Old 4th January 2014, 01:40 PM   #5
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Well Perhaps I wasnt clear. I forgot to mention that I am not building a full-range unit. I am building a subwoofer amplifier, so that chip should be ok.
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Old 4th January 2014, 07:17 PM   #6
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Catch
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Old 4th January 2014, 07:20 PM   #7
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Some foto & info more :
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Old 4th January 2014, 07:33 PM   #8
Dimonis is offline Dimonis  Russian Federation
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Here is the one with the discrete modulator , with low&high pass filters on board.
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Old 4th January 2014, 10:14 PM   #9
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Thats basically what I needed.

I am building this circuit to replace the S64AMI module in a crappy JBL Subwoofer.
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Old 5th January 2014, 08:51 AM   #10
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To post #8
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