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-   -   I designed the GC LM3875 (http://www.diyaudio.com/forums/chip-amps/209960-i-designed-gc-lm3875.html)

ljm_ljm 1st April 2012 04:04 PM

I designed the GC LM3875
 
4 Attachment(s)
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.

ljm_ljm 1st April 2012 04:08 PM

1 Attachment(s)
SCH:

ljm_ljm 1st April 2012 04:10 PM

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.

ljm_ljm 1st April 2012 04:11 PM

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.

Gopher 1st April 2012 05:32 PM

LJM - what exactly did you design?? It's just a data sheet implementation.

gootee 1st April 2012 06:03 PM

Quote:

Originally Posted by Gopher (Post 2968906)
LJM - what exactly did you design?? It's just a data sheet implementation.

You're kidding, right?

toprepairman 1st April 2012 06:49 PM

Curious to see where this goes, not sure what flavour an amp is supposed to have, strawberry? vanilla?.......

ashok 1st April 2012 07:11 PM

Or single Malt ? Like now.....Nadurra ! :drink:
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 ?

Boscoe 1st April 2012 07:59 PM

Nice PCB. 2200uF is a bit low for my liking. I prefer the protection and PSU seperate but that just my preference.

Dr_EM 1st April 2012 09:24 PM

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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