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Old 20th January 2013, 10:45 AM   #1
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Default Series power amp supply

Hi
I have a toroidal trafo of around 40 V sec and want use it for a stereo power amp. As it donít have center tap and I donít want to use classic output capacitor topologies, Iím thinking on use a pair of class D amplifiers.
The problem is that the class D amps Iím thinking of donít like more than say 30V supply.
So the question is: May I wire the two modules in series so each one draw half the voltage of the trafo?
Or..
At idle the amps will draw only a few volts and will be over voltage destruction.
The failure of one channel will destroy the other channel
The over voltage protection of the modules will have very hard times
The use of VDR will help orÖ will burn a lot of VDRís

Thanks on advance
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Old 20th January 2013, 10:47 AM   #2
AndrewT is online now AndrewT  Scotland
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Quote:
May I wire the two modules in series so each one draw half the voltage of the trafo?
No.
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Old 20th January 2013, 10:48 AM   #3
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Buy the correct transformer.
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Old 20th January 2013, 10:56 AM   #4
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thanks for the fast response.
Itīs a pity, cos seems a good trafo, rougly 400W from a wrecked Beomaster 6000
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Old 20th January 2013, 12:43 PM   #5
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Wouldn't two amplifiers in bridge configuration run from single supply defeat the need for output capacitors ? Each output would be half the supply voltage and speaker would see zero DC. Like it was done on older car radio chip amplifiers.
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