Can I do this?

Nuuk · 19th April 2009, 11:01 AM

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?

Bootstrapper · 19th April 2009, 06:40 PM

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!

Nuuk · 19th April 2009, 07:24 PM

Thanks Bootstrapper but I need +/- rails for the buffer!

19th April 2009, 11:01 AM	#1
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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? __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

19th April 2009, 06:40 PM	#2
Bootstrapper diyAudio Member Join Date: Sep 2007	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! __________________ -Juha

19th April 2009, 07:24 PM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Thanks Bootstrapper but I need +/- rails for the buffer! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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