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Old 2nd August 2012, 04:31 PM   #1
audio3 is offline audio3  Italy
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Default Hiraga power supply

Hello. I have a problem, anyone help me thank him. I'm building a Hiraga 20w (DIYAUDIOWORLD PCB) with salvage parts, I have a voltage of 27,5V , how can I do to bring it to 21V ?
Thanks
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Old 2nd August 2012, 05:30 PM   #2
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There are a couple of ways to accomplish this. The simplest would be to insert a power resistor in series with your power supply (one on each side, plus and minus). You might try something around 7-10 ohms initially. The power resistors should be rated for at least 25 watts and should be heat-sinked.
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Old 2nd August 2012, 06:37 PM   #3
audio3 is offline audio3  Italy
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Thanks, the other way?
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Old 2nd August 2012, 08:13 PM   #4
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You can use a regulated supply, though Hiraga generally does not recommend them for his Le Monstre or 20W amp.

Still another means of dropping voltage is to use a bunch of diodes in series. As with the resistors, they will need to be heatsinked.
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Old 2nd August 2012, 08:32 PM   #5
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It's no big problem running the 20W LeClasse A on 27,5V. In fact the original production version of the amp had 24V supplies, not 21V. At least the one I owned did.

Be aware that the PSRR of the LeClasse A is very low, so the PSU needs to be very stable and clean.
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Old 3rd August 2012, 12:11 PM   #6
audio3 is offline audio3  Italy
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Hello. Thanks guys for the answers!
Then I can feed it to 27.5 V, I make some changes to the values ​​of the resistors on the PCB?
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Old 4th August 2012, 04:50 PM   #7
juma is offline juma  Germany
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I do it with capacitance multiplier, like this:
Click the image to open in full size.
Rails' voltages will be about 4V lower, the ripple voltage will be decreased by about 50dB and, most important, your amp will sound better.
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Old 7th August 2012, 07:51 AM   #8
audio3 is offline audio3  Italy
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Thanks, I'll try these solutions.
Giorgio
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