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Old 28th August 2009, 09:01 PM   #1
shaan is online now shaan  India
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Default ESP Guitar Preamp Output Swing

The page says that for the diodes the power amplifier must have a sensitivity of 750mV for full power. I plan to run it with my 20Watt SE Class-A amp which has a sensitivity of 1.5V for full power.

Is there any way to increase the preamp's output voltage swing while keeping the soft clipping behavior intact?
Are there ways to make the preamp soft-clip by means other than using those diodes at the output?

http://sound.westhost.com/project27.htm

Thanks in advance.



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Old 28th August 2009, 10:12 PM   #2
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Originally Posted by shaan View Post
The page says that for the diodes the power amplifier must have a sensitivity of 750mV for full power. I plan to run it with my 20Watt SE Class-A amp which has a sensitivity of 1.5V for full power.

Is there any way to increase the preamp's output voltage swing while keeping the soft clipping behavior intact?
Are there ways to make the preamp soft-clip by means other than using those diodes at the output?

http://sound.westhost.com/project27.htm

Thanks in advance.



.

Outputs are usually 0dB so perhaps the two values are RMS and peak ?
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Old 29th August 2009, 12:09 AM   #3
juma is offline juma  Germany
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Originally Posted by shaan View Post
...Is there any way to increase the preamp's output voltage swing while keeping the soft clipping behavior intact?...
Yes, add another gain stage (another OpAmp, for example) with a gain of 2 (or more) on preamp's output (before the power amp).

Last edited by juma; 29th August 2009 at 12:14 AM.
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Old 29th August 2009, 12:32 AM   #4
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Yes, add another gain stage (another OpAmp, for example) with a gain of 2 (or more) on preamp's output (before the power amp).
Or alter your amp to have twice as much gain.
Its probably one resistor change to double the gain.

Last edited by nigelwright7557; 29th August 2009 at 12:37 AM.
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Old 29th August 2009, 12:48 AM   #5
juma is offline juma  Germany
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Originally Posted by nigelwright7557 View Post
Or alter your amp to have twice as much gain.
Its probably one resistor change to double the gain.
It might not work if the amp doesn't use a lot of GNFB.
BTW, what power amp are we talking about?
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Old 29th August 2009, 12:50 AM   #6
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It might not work if the amp doesn't use a lot of GNFB.
BTW, what power amp are we talking about?
The 20 watt amp he mentions in the first post.
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Old 29th August 2009, 12:53 AM   #7
juma is offline juma  Germany
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Originally Posted by nigelwright7557 View Post
The 20 watt amp he mentions in the first post.
Ha, ha, great answer - that much I've read myself.
I suppose the original poster should answer that question...
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Old 29th August 2009, 04:12 AM   #8
shaan is online now shaan  India
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Quote:
Originally Posted by juma View Post
Yes, add another gain stage (another OpAmp, for example) with a gain of 2 (or more) on preamp's output (before the power amp).
Thanks for the suggestion. On my way.
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Old 29th August 2009, 04:15 AM   #9
shaan is online now shaan  India
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Originally Posted by juma View Post
It might not work if the amp doesn't use a lot of GNFB.
BTW, what power amp are we talking about?
It's a common drain MOSFET power follower driven by DoZ preamp, modified with the maximum suggested gain in the article.

http://sound.westhost.com/project83.htm
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Old 29th August 2009, 04:19 AM   #10
shaan is online now shaan  India
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Plus, I was wondering whether any kind soul would answer my second question or not?
"Are there ways to make the preamp soft-clip by means other than using those diodes at the output?"
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