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Old 21st January 2006, 12:48 AM   #11
Join Date: Mar 2005
Location: Australia
ok NP is coming to show you how, my two cents..
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Old 21st January 2006, 02:45 AM   #12
CBS240 is offline CBS240  United States
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Location: K-town
It seems to me that it would be easier and cheaper in the long run to just over design the amp for what you are going to listen too. This would take out the potential of the elaborate protection circuits to affect the quality of the audio signal and keep it back to basics.

If SOA is such a problem for you, and you have no problem with making some sort of complex protection circuit, then maybe you should investigate class G (or maybe H) designs. I like G better because the top rail follows the audio and doesn't introduce HF switching noise. Perhaps Fets for the top rail and BJT's for the bottom?
All the trouble I've ever been in started out as fun......
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Old 21st January 2006, 11:55 AM   #13
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I have seen some unusual speaker designs (ribbon tweeters?) which fell to about 1R at 20kHz. Try overdesigning for that one. It seems crazy but actually measuring the output transistor status in real time is cheaper than more robust ( and more quantity) output transistors.
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Old 31st January 2006, 07:26 AM   #14
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Location: Genova, Italy
hi all

From Rods pages:
For the 3 ohm case, a reactive load (at 45 phase angle) can be simulated by using a 477uH inductor in series with the 3 ohm resistor (for a frequency of 1kHz)
thanks for the reference, Jens

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