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8th January 2012, 06:35 PM
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#1 |
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diyAudio Member
Join Date: Sep 2009
Location: Pretoria
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Max allowable DC offset for power amplifier
What is the Max allowable DC offset for a Power amplifier- 100W or so.
I know it's not an exact science, but there should be a limit!? I'm feeding a 4ohm speaker. With the speaker connected I measure 40mV. Don't see any speaker excursions. |
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8th January 2012, 06:48 PM
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#2 |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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100mV as absolute limit , after temp equilibrium
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my Papa is smarter than your Nelson ! tnx to  clean  thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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8th January 2012, 06:52 PM
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#3 |
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diyAudio Member
Join Date: Dec 2010
Location: Paris, Ontario
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You are right about the 'not an exact science' bit. Some would have you believe any DC offset is unacceptable, others ate more liberal. IMHO, I would suggest there is no hard fault if it is 100mV or less, but pursuing a lower DC offset than that is good practice. I like to see offsets less than 25mV in general practice.
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---Jason Kuetemann--- The greatest trick the Devil ever pulled was convincing the world he didn't exist; and like that, he's gone. |
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8th January 2012, 06:54 PM
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#4 | |
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diyAudio Member
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Quote:
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"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig. |
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8th January 2012, 08:48 PM
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#6 |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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If the range of DC offset when measured by the specified method is +-XYmVdc from cold to fully warmed up for Ta between 0degC to 40degC and you measure a random sample at >XYmVdc then you know that either you have measured it incorrectly, or the amplifier is faulty. Get it fixed, if it is outside specification.
Knowing that it is 40mVdc is only half the story. What are the specification limits?
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