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Old 1st April 2012, 04:04 PM   #1
ljm_ljm is offline ljm_ljm  China
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Default I designed the GC LM3875

I would have done six years ago the easiest GCLM3875. Did not use the PCB. Only a few resistors, capacitor structures formed.

Now I miss it and want to improve it so that my friends like it was made very easy.

LM3875, LM4766 I liked them.
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Old 1st April 2012, 04:08 PM   #2
ljm_ljm is offline ljm_ljm  China
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SCH:
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Old 1st April 2012, 04:10 PM   #3
ljm_ljm is offline ljm_ljm  China
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Complete Reference style 47LAB 3875.

Reference 50 watts output power versions. Two 2200UF capacitor.

Integration by adding the protection circuit board .10 * 2 relay reliable.

Backside of the PCB, DC location, said the short here, the negative feedback using DC.
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Old 1st April 2012, 04:11 PM   #4
ljm_ljm is offline ljm_ljm  China
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I like the sound of the IC. My opinion, than the LM4780, LM3886 more flavor.

For this reason it's slower than the LM3886, there will be a very good flavor.
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Old 1st April 2012, 05:32 PM   #5
Gopher is offline Gopher  United Kingdom
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LJM - what exactly did you design?? It's just a data sheet implementation.
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Old 1st April 2012, 06:03 PM   #6
gootee is offline gootee  United States
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Quote:
Originally Posted by Gopher View Post
LJM - what exactly did you design?? It's just a data sheet implementation.
You're kidding, right?
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Old 1st April 2012, 06:49 PM   #7
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Curious to see where this goes, not sure what flavour an amp is supposed to have, strawberry? vanilla?.......
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Old 1st April 2012, 07:11 PM   #8
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Or single Malt ? Like now.....Nadurra !
It's late, I'm off to bed !

Edit: Pretty big relay on that tiny board. Looks interesting.Will do a closer inspection tomorrow !
Looks like a text book implementation with relay protection. Neat . What brand is that relay ?
PCB's available ?
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Last edited by ashok; 1st April 2012 at 07:17 PM.
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Old 1st April 2012, 07:59 PM   #9
Boscoe is offline Boscoe  United Kingdom
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Nice PCB. 2200uF is a bit low for my liking. I prefer the protection and PSU seperate but that just my preference.
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Old 1st April 2012, 09:24 PM   #10
Dr_EM is offline Dr_EM  United Kingdom
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Interesting. I used a relay of this sort in one of my amplifiers and it has since failed, or at least became unreliable. Not because it has ever tripped, but I presume just from contamination of the contacts by the air, so I presume a fully sealed type is a better option.

Probably going to be trying out a solid state MOSFET system to replace it, looking like this may be the way to go for DC protection really.
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