LM3875T stereo

[soundbabe]

Hello Guys,

I am A newbie Here,
I have bought four LM3875T Power amplifiers. My question As a newbie in the amplifiers arena is:
1: Can I simply use 2 of the said chips to make a setero amplifier?
2: is there any circuit/schematic to direct me how to do so?
3: Is this a COMMON method, or I have to use a setero power amplifier chip?, What method is better?
4: Can I use a single heatsink for bothe said chips when I build a stereo amplifier out of them?

Thanks in advance.

[Th3 uN1Qu3]

1. Stereo? Um, yes, of course.
2. You take your basic stereo cable. Left (white) goes to input of one chip, right (red) goes to the input of the other. Ground (black or simply bare copper wire) goes to ground of both chips.
3. Yes it's a common method to use 2 mono amps to make a stereo amp, because in effect a stereo amp is two mono amps, and a 5.1 amp is 6 mono amps.
4. With identical chips, you can use both the same heatsink and the same power supply.

[lanchile]

Originally Posted by soundbabe

Hello Guys,

I am A newbie Here,
I have bought four LM3875T Power amplifiers. My question As a newbie in the amplifiers arena is:
1: Can I simply use 2 of the said chips to make a setero amplifier?
2: is there any circuit/schematic to direct me how to do so?
3: Is this a COMMON method, or I have to use a setero power amplifier chip?, What method is better?
4: Can I use a single heatsink for bothe said chips when I build a stereo amplifier out of them?

Thanks in advance.

Well, the easy way will be if you order some boards from Audiosector and fallow step by step.
http://www.audiosector.com/nigc_kit-users_guide.pdf

[danielwritesbac]

The much easier way is to follow one of the projects at Decibel Dungeon
here
Gainclone chip amp index page

[soundbabe]

Originally Posted by Th3 uN1Qu3

1. Stereo? Um, yes, of course.
2. You take your basic stereo cable. Left (white) goes to input of one chip, right (red) goes to the input of the other. Ground (black or simply bare copper wire) goes to ground of both chips.
3. Yes it's a common method to use 2 mono amps to make a stereo amp, because in effect a stereo amp is two mono amps, and a 5.1 amp is 6 mono amps.
4. With identical chips, you can use both the same heatsink and the same power supply.

Ok thanks,

Is there any link to direct me to the bisics of a stereo amplofier, Or any link to a schematic of using any mono spreate chips to create a stereo Amplifier?

What did you mean by "and a 5.1 amp is 6 mono amps."?

About the problem noumber 4, Do I need to insulte both chips in a single heatsink?

I have worked with TDA1557 as a stereo chip, but I felt the both channels affect each other by having the a weak left output to the right channel and vice versa?

[soundbabe]

Originally Posted by danielwritesbac

The much easier way is to follow one of the projects at Decibel Dungeon
here
Gainclone chip amp index page

Which project do you mean ans suggest please?

[soundbabe]

Originally Posted by lanchile

Well, the easy way will be if you order some boards from Audiosector and fallow step by step.
http://www.audiosector.com/nigc_kit-users_guide.pdf

It was a helpful link, thanks for it,

[soundbabe]

Can you guys please let me know the MAX og gain I can get out of LM3875T at 100kHz? I mean If I want the chip to work at 70kHz to 100KHz then what gain I must expect, yet allowing the chip to work in a liner state?

[ratza]

Maximum open loop gain at 100kHz is around 37dB.

[AndrewT]

Hi,
have you downloaded the National datasheet for that chipamp?
and
overture design guide (excel spreadsheet)
and
AN 898
and
AN 1849