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16th April 2010, 07:25 PM
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#1 |
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diyAudio Member
Join Date: Mar 2008
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About two Output Stage
Hi, what output stage you consider optimal or best for a low power amplifier (<20W)?
Distorsion / Sound / Thermal Estability / Zout / optimal Iq / . . . figure2 need 2 preset (R30/R31) to set the same Iq on power transistor?
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17th April 2010, 04:27 AM
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#2 |
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diyAudio Member
Join Date: Jan 2007
Location: Berkeley, California
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The first one, which is rather a standard Darlington configuration. The second one is for low power output and you'll need a lot of changes to adopt it for 20W output.
The first one may oscillate dependent on the choice of output transistors, layout, VAS, characteristics of the speaker and cable connected, etc. So, watch out! Have fun! Regards, Satoru |
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17th April 2010, 05:34 PM
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#3 |
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diyAudio Member
Join Date: Sep 2008
Location: Here
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The only changes you will make to the second one is to use proper outputs and increase the the current sources. I have seen commercial amps with 100W output using the same basic circuit with more output pairs.
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