lm1875 x4

[Astaro]

Will it work?

 

[Clueless but avid]

The better the gain resistors are matched, the better is the chance it could work. It has to be 0,1% or better. This is not tested by own experience, because my Multimeter isn't good enough . It's just what I read.

 

[JonSnell Electronic]

Schematic and your topology aside, as there is likely to be 30mV DC difference between the output pins of the LM1875s. May cause a heating issue.
Why not use them to drive high power transistors instead.

 

[Astaro]

Why not use them to drive high power transistors instead.

because I love how my 1875 amp plays mini speakers with a 4.5 " woofer and don't like how it at two 8" in channel

 

[Astaro]

think lm1875 the most musical of the circuits of the amplifier, as ad1853 of DAC chips

 

[Astaro]

may be it`s better (need power board separate) ?

stable power supply can be used.

 

[chermann]

nay news about 4x 1875?...


chris

 

[Aswin2]

I tried a 4 x LM1875 parallel configuration and it did not work.
High currents on start up. I had to raise the output resistors to 0.68R.

Because of the heat dissipation I ended with 2 x LM1875 in parallel with 0.33R output resistors.

 

[chermann]

Thanks Aswin
can you post here your schematic please. which gain didi you use?
chris