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Gainclone power supply question.
http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=2805
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Author:  skatefriday [ 22 Nov 2010, 12:01 ]
Post subject:  Gainclone power supply question.

In the power supply schematic shown here...

http://diyaudioprojects.com/Chip/LM3886 ... 886_CA.htm

Image

Is the 2.2k 2W resistor sitting next the 10,000mF cap there to discharge the cap when power is removed, or does it serve another purpose?

Author:  tombethe [ 22 Nov 2010, 17:30 ]
Post subject:  Re: Gainclone power supply question.

Hi there,

this 2K2 / 2W resistor discharges the cap on power removal. It's a so called "bleeder resistor" which is used
in nearly all supplies with high capacitance / high current or high voltage.

Author:  Gio [ 22 Nov 2010, 18:40 ]
Post subject:  Re: Gainclone power supply question.

The bleeder resistor serves two purposes. Safety, it bleeds off the charge from the capacitor so you don't get accidentally zapped when you service the amp and it also increases the life of the capacitor.
Cheers

Author:  skatefriday [ 01 Dec 2010, 21:08 ]
Post subject:  Re: Gainclone power supply question.

Thanks for the answer. One more question. If I have a center tapped transformer
where does the center tap wire go? That would appear to be something that the
drawer of this circuit diagram just assumed I would know.

Thanks!

Author:  Gio [ 02 Dec 2010, 13:30 ]
Post subject:  Re: Gainclone power supply question.

For a center-tapped transformer you only need one rectifier bridge.

There are a couple of suitable power supplies shown on these projects:
http://diyaudioprojects.com/Chip/Synerg ... Gainclone/
http://diyaudioprojects.com/Chip/Nanoo/

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