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Chip Amps Amplifiers based on integrated circuits

lm1875 x4
lm1875 x4
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Old 1st May 2019, 12:38 PM   #1
Astaro is offline Astaro  Russian Federation
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Default lm1875 x4

Will it work?
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Old 1st May 2019, 01:48 PM   #2
Clueless but avid is offline Clueless but avid  Germany
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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.
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Old 1st May 2019, 01:55 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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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.
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Old 1st May 2019, 05:10 PM   #4
Astaro is offline Astaro  Russian Federation
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Quote:
Originally Posted by JonSnell Electronic View Post
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
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Old 1st May 2019, 05:15 PM   #5
Astaro is offline Astaro  Russian Federation
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think lm1875 the most musical of the circuits of the amplifier, as ad1853 of DAC chips
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Old 5th June 2019, 08:20 AM   #6
Astaro is offline Astaro  Russian Federation
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may be it`s better (need power board separate) ?

stable power supply can be used.
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Old 17th November 2019, 07:38 PM   #7
chermann is offline chermann  Austria
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nay news about 4x 1875?...


chris
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Old 17th November 2019, 09:24 PM   #8
Aswin2 is offline Aswin2  Netherlands
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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.
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Old 18th November 2019, 05:23 AM   #9
chermann is offline chermann  Austria
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Thanks Aswin
can you post here your schematic please. which gain didi you use?
chris
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