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Old 29th November 2004, 02:33 PM   #11
Electrons are yellow and more is better!
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How often should you change the voltage and why? How much current does the amp consume?

Your diodes can take 325 A non-repetitive and 70 A repetitive.
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Old 29th November 2004, 02:36 PM   #12
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It might happen pretty often. The reason to switch voltage is to save power for background listening at 20W music power, while having the option to get a lot of power for higher volume/ critical listening with 50W. This can be achieved by switching the voltage.

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Old 29th November 2004, 02:39 PM   #13
Electrons are yellow and more is better!
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Can't you solve this with two transformers. Put the 230 V primary windings in series or in parallel. I assume that you don't need to switch when the power is switched on?

I think you can forget a solid state relay but I think it's quite possible to solve this with a couple of bauta mosfets.
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Old 29th November 2004, 02:46 PM   #14
Magura is offline Magura  Denmark
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Well, part of the trick would be the ability to switch while powered. The caps should be adequately big to supply 0.2sec. of power and let it run seamless.

I guess it would be worth mentioning that I use a PLC for the control of the amp.

The end solution just might be to build a more powerfull bridge and switch the secondaries before the rectifier.

I guess 2 bridges in parallel is a bad idea??

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Old 29th November 2004, 02:52 PM   #15
Electrons are yellow and more is better!
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That is a good idea and them switching between two transformers.
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Old 29th November 2004, 02:53 PM   #16
Magura is offline Magura  Denmark
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Thanks, problem solved.

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