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Old 8th March 2012, 04:56 PM   #1731
norazmi is offline norazmi  Malaysia
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Thanks CPX
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Old 8th March 2012, 05:15 PM   #1732
CPX is offline CPX  Romania
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We're welcome.
You can even use ultra low noise opamps if you find you ucd noisy,decrease lm311 gain to 5x and increase its supply rails to +-15v and use this modified circuit to obtain total gain 25x with global noise much better than with standard lm311 with gain of 25.

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Last edited by CPX; 8th March 2012 at 05:19 PM.
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Old 8th March 2012, 06:35 PM   #1733
norazmi is offline norazmi  Malaysia
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ok, i`ve some issue when up the gain of the op-amp, it will distort the input signal if the gain is too much even at low volume, so i think need to find out the maximum gain can be accepted for each amp, 25x gain lol its too much i think, but i like ultra low noise.

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Old 8th March 2012, 07:12 PM   #1734
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by CPX View Post
We're welcome.
decrease lm311 gain to 5x and increase its supply rails to +-15v
What relationship between supply and gain?
Optimal gain is about 10.
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Old 8th March 2012, 07:32 PM   #1735
CPX is offline CPX  Romania
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Yes gain 10 is good..but snr is better with gain decrease if you use a ultra low noise op amp befere ...
If you decrease gain you have to increase lm311 supplies to avoid clipping..for gain 10 and +-12 volt suplies you can have maximum 60 volt rms output,for gain 5 you can have maximum 30 and so on...for gain 5 and +-6 volt you can have maximim 15..etc
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Old 8th March 2012, 09:32 PM   #1736
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Default bridging ucd amplifier

Hi Cpx
greetings thanks for sharing schematics
warm regards
andrew lebon
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Old 9th March 2012, 06:32 AM   #1737
manojtm is offline manojtm  India
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Hi All

Just posting My New Design PLS check any correction have ,noted
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File Type: jpg UCD650.jpg (587.7 KB, 725 views)
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Old 9th March 2012, 06:49 AM   #1738
Dimonis is offline Dimonis  Russian Federation
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Quote:
Originally Posted by CPX View Post
Yes gain 10 is good..but snr is better with gain decrease if you use a ultra low noise op amp befere ...
If you decrease gain you have to increase lm311 supplies to avoid clipping..for gain 10 and +-12 volt suplies you can have maximum 60 volt rms output,for gain 5 you can have maximum 30 and so on...for gain 5 and +-6 volt you can have maximim 15..etc
I see , clipping occures on the input , not at the output
I'm using the inverting kind of input , hence i'll dont get any clipping even at low supply.
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Old 9th March 2012, 07:27 AM   #1739
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Default HELLO

Hi Manojtm
greetings whats power of amp at 80 volt dc supply and is it suitable for 2 ohms load nice work
warm regards
andrew lebon
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Old 9th March 2012, 08:38 AM   #1740
manojtm is offline manojtm  India
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thanks
RMS 710W @ 4ohm
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