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Old 24th March 2009, 06:14 PM   #11
AndrewT is offline AndrewT  Scotland
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Hi,
What is the peak current demand of an 8ohm speaker?

200W into 8r0 approximates to 7.1Apk for sinewave power.
An 8ohm speaker can require three times this, i.e. 20Apk on fast transients.

Where can that current peak come from?
Can some of this demand be met by the decoupling close to the output stage?

What is the peak transient current that is permitted in a warm or hot 3055?
How many 3055 are required to meet the remaining peak transient current demand of that 8ohm speaker.
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Old 24th March 2009, 06:22 PM   #12
rhysh is offline rhysh  United Kingdom
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Hi, we will be running a maximum of 150w into an 8 ohm speaker, or 300w into 4ohms.

There is 8,800uf of decoupling per rail, for 6 LM3386, running at 30V rails.

The continuos collector current of each 3055 is 11A @ 50C.
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