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Old 26th August 2007, 01:54 PM   #1
tadiam is offline tadiam  Argentina
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Default help treble

Hello diy friends
I have an cuestion…i build this lm1875 gainclone schematic…(Introduction) work well but need more treble response…I put an 100n capacitor in parell with the 1R 10K resistor have more treble but at low volume the sound is flat…..
Sugestions….
http://www.euronet.nl/~mgw/diy/amps/uk_gainclown_1.html
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Old 26th August 2007, 02:51 PM   #2
Nordic is offline Nordic  South Africa
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For best results, do your equalisation before the amp... and not as part of the feedback chain...

imagine your amp was flat to 1kHz, but it boosts signals from 1kHz upwards by 20%... (imaginary number for illustration)

Lets say your amp had a gain of 10 times the input voltage....

you feed it a sinusoidal tone... starting at low frequency, and slowly ramp up the frequency, while measuring the output...

Up to 1k you get your 10V output... but when you exceed it, your amp has through some error mechanism have to come to the result of outputting 12V because of the trebble boost... Nature takes care of itself and we can't break it... and you still get sound ou t doing what you did... but it is further from being a magnified copy of the input... than modifying your signal before it gets to the amp... and amplifying that consistantly....
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Old 26th August 2007, 05:06 PM   #3
tadiam is offline tadiam  Argentina
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thanks
my speakers an pair of polk ls70
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Old 26th August 2007, 05:32 PM   #4
Nordic is offline Nordic  South Africa
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Why not try a simple equaliser around a buffer IC before your amp
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Old 26th August 2007, 10:44 PM   #5
tadiam is offline tadiam  Argentina
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thanks thanks nordic
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