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Old 18th May 2003, 06:44 PM   #1
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Default voltage-sonic relationship in Gainclone

After searching for the gainclone circuits on the internet, I noticed that some of the circuits employed a symmetric (i.e. +ve and -ve)supply whereas other use only "asymmetric" supply (i.e. +ve and ground). Are there any difference between the two with respect to the performance of the amp? In addition, I would be very interested to learn the difference in the sonic character with different voltages.

I have a bench power supply which has 2 separate outputs of 0-18v and 5A. I am thinking of whether I can use it in my gainclone project. The 2 outputs can be wire in series which gives 0-36v and 5A, or +18v-0--18v and 5A. Is it going to be OK for the gainclone?

Thank you in advance for your kind help.


Best wishes,
Russell SIT
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Old 19th May 2003, 01:21 AM   #2
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Default Addendum

I have forgotten to add that I am going to use the amp to drive a 4ohm floor-standing speakers.

Thanks for your kind attention.


Best wishes,
Russell SIT
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Old 19th May 2003, 01:30 AM   #3
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Default btw

when determining the "gain" of the gainclone, you can look to the equations in the National Semi ap-notes to calculate the resistance ratio in relation to load AND the power supply voltage.
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Old 20th May 2003, 09:18 AM   #4
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Thnak you for pointing me to the equations.

Actually I have done the calculation. With maximum 2.5A per channel. the power is limited to only 12.5w, which is rather low (my speakers' sensitivity is 89dB/w/m). However, I am more interested to know the sonic character of the LM3875 when supply with a relatively low voltage (+/- 18v) from a regulated power supply. On the other hand, would it be better to build a dedicated power supply?

Thanks again for your knd help.


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russell SIT
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Old 20th May 2003, 09:33 AM   #5
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Default gainclone

By using a symmetric supply you can leave out the speaker coupling electrolytic, with immediate savings and better sound.

The 2.5amp spec is somewhat misleading. Assuming that you have some supply electrolytics in either the supplies or in the gainclone, you can safely assume that for music reproduction the power limit is set by the supply voltage and not the available supply from the bench supply.

Jan Didden
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