Bridging/Paralleling LM1875

CarlosT · 23rd January 2007, 03:08 PM

The LM1875 seems like a really nice simple true 5-pin chip but I never saw a schematic for daisychaining or paralleling chip amps.

Can someone post a schematic?

What are the general concepts on how to use multiple op amps in tandem?

Leolabs · 24th January 2007, 12:43 AM

Treat them as the usual BPA.

BWRX · 24th January 2007, 01:37 AM

The LM3875 only uses 5 pins and is more capable.

carpow · 28th January 2007, 09:43 AM

SEE PIC

theChris · 28th January 2007, 03:38 PM

there are other opamp-boost type circuits that use the high open loop gain of the opamp with the higher current dri\/e* of some discrete transistors to gi\/e* more power.

the lm1875 is not best suited for this application in that other IC amplifiers pro\/ide* more power without resorting to the parallel scheme. the LM4780 in a bridge configuration can pro\/ide* more power then the bridge-parallel combo of LM1785's.

otherwise, see the BPA schematics from the lm4780 datasheet. the lm1875 is the same, but does not ha\/e* the mute feature.

*i seem to ha\/e* lost the key that makes the spelling correct. my keyboard is \/ery* old.

23rd January 2007, 03:08 PM	#1
CarlosT diyAudio Member Join Date: Oct 2006	Bridging/Paralleling LM1875 The LM1875 seems like a really nice simple true 5-pin chip but I never saw a schematic for daisychaining or paralleling chip amps. Can someone post a schematic? What are the general concepts on how to use multiple op amps in tandem?

24th January 2007, 01:37 AM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	The LM3875 only uses 5 pins and is more capable. __________________ Brian

28th January 2007, 03:38 PM	#5
theChris diyAudio Member Join Date: Dec 2001 Location: SIUE, Illinois, USA	there are other opamp-boost type circuits that use the high open loop gain of the opamp with the higher current dri\/e* of some discrete transistors to gi\/e* more power. the lm1875 is not best suited for this application in that other IC amplifiers pro\/ide* more power without resorting to the parallel scheme. the LM4780 in a bridge configuration can pro\/ide* more power then the bridge-parallel combo of LM1785's. otherwise, see the BPA schematics from the lm4780 datasheet. the lm1875 is the same, but does not ha\/e* the mute feature. i seem to ha\/e lost the key that makes the spelling correct. my keyboard is \/ery* old. __________________ if only it could be used for good, not evil...

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24th January 2007, 12:43 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Treat them as the usual BPA.

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