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Old 19th July 2005, 10:11 PM   #1
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Default An early LM12 chipamp design

i came across this looking for an article in Radio Electronics (no longer published) --

http://www.tech-diy.com/earlychipampdesign.htm
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Old 19th July 2005, 11:07 PM   #2
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I think i`ve got some of these old chips around somewhere ? (just got to find them).


It would be nice to power then back up just to see if they work!.
Plus see if they sound any better or worse than the new lm chips (lm3875 , lm4780) .
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Old 19th July 2005, 11:32 PM   #3
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I think i`ve got some of these old chips around somewhere ? (just got to find them).


It would be nice to power then back up just to see if they work!.
Plus see if they sound any better or worse than the new lm chips (lm3875 , lm4780) .
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Old 20th July 2005, 12:42 AM   #4
cm961 is offline cm961  Canada
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I built a four channel LM12 amp. It sounded great. The transformer was undersized though, you could hear a compression type sound. Then the crossovers stopped working.

Pete
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Old 20th July 2005, 12:43 AM   #5
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A portuguese diyer friend has made one, some time ago.

Is this a gainclone?
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Old 20th July 2005, 09:08 AM   #6
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Id like to get two of these, 300 watts into 2 ohm if i paralell two.

Anyone got two to sell ?
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Old 20th July 2005, 05:13 PM   #7
DC Dave is offline DC Dave  United States
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Quote:
Originally posted by Tekko
Id like to get two of these, 300 watts into 2 ohm if i paralell two.

Anyone got two to sell ?

Digikey still sells them. Not exactly cheap though, $20 per ic
http://www.digikey.com/scripts/DkSea...338604&Site=US

Here's the datasheet from National.
http://cache.national.com/ds/LM/LM12CL.pdf

Could be a fun project for people looking to try a different chip.
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Old 20th July 2005, 05:23 PM   #8
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Nevermind. I found a better suited ic.
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Old 21st July 2005, 02:17 AM   #9
XELB is offline XELB  Portugal
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How does it sounds ?


If it sound great, I think this could be a nice OpAmp for a active subwoofer ( I guess... )
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Old 21st July 2005, 11:25 AM   #10
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I am surprised that no-one has (apparently) seen that the article contains a schematic and PCB layout for a 12V switching power supply for the LM12.
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