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Old 25th October 2009, 03:43 PM   #1
skogs is offline skogs  Norway
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Default Power supply voltage limiter

Hi! I have a power supply that delivers +-38V. The problem is that the amplifier im using it for is rated +-36V max. So, could i use diodes to limit the voltage on the PS? And how?

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Old 25th October 2009, 04:55 PM   #2
star882 is offline star882  United States
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Modify the voltage regulation to output a lower voltage.
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Old 26th October 2009, 07:54 AM   #3
skogs is offline skogs  Norway
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Its really the transformer that delivers too high voltage, are you sure i can drop the voltage modifying the rectifier-stage?
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Old 26th October 2009, 02:01 PM   #4
star882 is offline star882  United States
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Add a voltage regulator, then. Or add an autotransformer to step down the input a little bit.
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Old 29th October 2009, 12:32 PM   #5
skogs is offline skogs  Norway
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If you could send me a link to the components you are refering to, that would be really great!
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Old 6th November 2009, 05:18 PM   #6
udailey is offline udailey  United States
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You could use an LM338 for instance, but remember you must be able to drop the full current. If you are going for 36V probably you run the risk of large current and then the voltage regulators that could handle it get expensive.
Another thing you can do is to add series resistance to get a voltage drop in your PSU.
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