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Old 19th April 2009, 11:01 AM   #1
Nuuk is offline Nuuk  United Kingdom
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Default Can I do this?

I want an external PSU for my Scot Nixon DacKit and Pedja Rogic Jfet buffers. And I want to use the following circuit (caps etc omitted for clarity).

It looks OK to me but is there any potential problem doing it like this?

Click the image to open in full size.
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Old 19th April 2009, 06:40 PM   #2
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Personally I would consider generating the +/- 19 volts out of the first secondary of the transformer and +/- 12 volts from the second secondary. There's no point using two regulators in series to generate +/- 12 V since the rectified voltage (21 V) is low enough for a single regulator to handle.

Then again, if you have 15 V regs on the board, why regulate 19 V? Feed the rectified voltage straight to the board! However, you CAN regulate the 19 V first, then 15 V or 12 V on the boards. This may lead to cleaner supply voltage, depending on the decoupling.

These came quickly to my mind. Hope they are of any help!
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Old 19th April 2009, 07:24 PM   #3
Nuuk is offline Nuuk  United Kingdom
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Thanks Bootstrapper but I need +/- rails for the buffer!
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