help treble

tadiam · 26th August 2007, 01:54 PM

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

Nordic · 26th August 2007, 02:51 PM

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....

tadiam · 26th August 2007, 05:06 PM

thanks
my speakers an pair of polk ls70

Nordic · 26th August 2007, 05:32 PM

Why not try a simple equaliser around a buffer IC before your amp

tadiam · 26th August 2007, 10:44 PM

thanks thanks nordic

26th August 2007, 01:54 PM	#1
tadiam diyAudio Member Join Date: Mar 2007	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 __________________ audio

26th August 2007, 05:06 PM	#3
tadiam diyAudio Member Join Date: Mar 2007	thanks my speakers an pair of polk ls70 __________________ audio

26th August 2007, 10:44 PM	#5
tadiam diyAudio Member Join Date: Mar 2007	thanks thanks nordic __________________ audio

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26th August 2007, 02:51 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	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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