John Curl's Blowtorch preamplifier part II - Page 43 - diyAudio
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Old 23rd July 2009, 02:24 AM   #421
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The latest questions can be easily answered by both Rick and Infinite. I am in to much pain to try. Sorry.
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Old 23rd July 2009, 02:26 AM   #422
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Quote:
Originally posted by infinia
BTW I think the primary reasons for "unpleasant sounds" are due to those haphazard class AB poweramps and mostly the evil Sanyo solutions.
Could you elaborate a bit term "Sanyo solution", I'm not familiar with it.
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Old 23rd July 2009, 03:02 AM   #423
infinia is offline infinia  United States
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Quote:
Originally posted by aparatusonitus


Could you elaborate a bit term "Sanyo solution", I'm not familiar with it.
1G plastic module/thick film power amps for audio

example see http://www.bmm-electronics.com/Produ...Product_ID=185
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Old 23rd July 2009, 03:23 AM   #424
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Oh, I see, thx...an solution
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Old 23rd July 2009, 03:42 AM   #425
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at least a step above a 'chip' (monolythyc) amp.
sorta hybryd ?
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Old 23rd July 2009, 03:59 AM   #426
1audio is offline 1audio  United States
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Quote:
Originally posted by hitsware
at least a step above a 'chip' (monolythyc) amp.
sorta hybryd ?
Chipamp like this?
47labs Gaincard
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Old 23rd July 2009, 04:07 AM   #427
EUVL is offline EUVL  Europe
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> AD844 is an great opamp (I'm using it as well)...but it has one big flaw...it's out of production, so availability, even for diy purpose, in future is questionable.

??

At least no mention on the AD website :

http://www.analog.com/en/other/milit...s/product.html


Patrick
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Old 23rd July 2009, 04:10 AM   #428
anatech is offline anatech  Canada
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Hi Demian,
How dare you!

Those thick film Sanyo things gave the service depots more business than anything else since the beginning of the transistor audio era. They were perfect! Just replace the black thing with all the legs, ECG has one that fits all. Of course, countless "techs" still managed to destroy the pads. Then there were the guys who soldered the pins before cranking the package down. It really was wild and woolly back then.

Sanyo then really caused havoc by discontinuing popular parts on a regular interval. Just try and tell a customer that his output stage is discontinued. That was always fun, but so was using a mark IV part where a mark II used to be. They would generally oscillate, that's if the number of pins were the same on each version.

I am so glad those days are almost over. This solution is now called " a chip amp".

-Chris
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Old 23rd July 2009, 04:23 AM   #429
1audio is offline 1audio  United States
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For the record, I may have been the first to use National chip amps in audio. I used the LM12 as amplifiers for the Entec subwoofer. In the thousands we used only 2 or 3 ever failed.
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Old 23rd July 2009, 04:29 AM   #430
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Quote:
Originally posted by EUVL
At least no mention on the AD website
I'm so glad to be wrong in this case...but I could swear that I read "OBSOLETE" written over datasheet.
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