LM1875 based on the LM1876 datasheet schematic??

w00t · 14th March 2005, 03:04 PM

Hi all,

I saw the LM1876 (http://cache.national.com/ds/LM/LM1876.pdf) schematic on page 2 and compared it with LM1875's (http://cache.national.com/ds/LM/LM1875.pdf) on page 1...

LM1876 have a MUCH lesser part count... there's no input cap... no resistor to ground at the input... Can i safely use this schematic for LM1875? What would the input impedence be then?

LM1876 is a stereo version of LM1875 right? Just like what LM4780 is to LM3886??

Thanks! Cheers!

demogorgon · 14th March 2005, 07:08 PM

Hi!

you are right that teh lm1876 are the dual version of the 1875.
i have not looked at the datacheets, but since they are the same chip, using either circut will work, they are only opamps remember..

56k is a nice standard for input impedans btw.
and keep the imput cap, at least until you have made certain you have no dc offset from your source.. i like to keep them there for safty resons anyway.

richwalters · 14th March 2005, 08:23 PM

Hi there.......watch the layout with these ic's.......duff psu return v.s sig ground = high thd....the low sig/ noise ratio is attractive.....when circuit well designed these ic's can produce good sound. I've even used them as power headphone amps, (with a relay in the o/p to delay start and quick off to avoid plops) although one can just make out the hiss.

richj

14th March 2005, 03:04 PM	#1
w00t diyAudio Member Join Date: Aug 2003 Location: Singapore	LM1875 based on the LM1876 datasheet schematic?? Hi all, I saw the LM1876 (http://cache.national.com/ds/LM/LM1876.pdf) schematic on page 2 and compared it with LM1875's (http://cache.national.com/ds/LM/LM1875.pdf) on page 1... LM1876 have a MUCH lesser part count... there's no input cap... no resistor to ground at the input... Can i safely use this schematic for LM1875? What would the input impedence be then? LM1876 is a stereo version of LM1875 right? Just like what LM4780 is to LM3886?? Thanks! Cheers!

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14th March 2005, 07:08 PM	#2
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	Hi! you are right that teh lm1876 are the dual version of the 1875. i have not looked at the datacheets, but since they are the same chip, using either circut will work, they are only opamps remember.. 56k is a nice standard for input impedans btw. and keep the imput cap, at least until you have made certain you have no dc offset from your source.. i like to keep them there for safty resons anyway.

14th March 2005, 08:23 PM	#3
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	Hi there.......watch the layout with these ic's.......duff psu return v.s sig ground = high thd....the low sig/ noise ratio is attractive.....when circuit well designed these ic's can produce good sound. I've even used them as power headphone amps, (with a relay in the o/p to delay start and quick off to avoid plops) although one can just make out the hiss. richj

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