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LM3886 + JFET Phono
http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=5798
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Author:  Nimrod216 [ 31 Jan 2017, 13:58 ]
Post subject:  LM3886 + JFET Phono

Hi all,
New here at DYIaudio, my name is Nimrod and I am From Israel.
I am new to the electorincs design.
I want to make LM3886 amp and JFET phono at the following configuration:
Image

Is it possible? do I need more components?
Thank you for your help,
Nimrod.

Author:  Gio [ 31 Jan 2017, 23:23 ]
Post subject:  Re: LM3886 + JFET Phono

Hi - the image you posted is not showing.

Author:  Nimrod216 [ 01 Feb 2017, 01:07 ]
Post subject:  Re: LM3886 + JFET Phono

Sorry,
Here it is:
Image

Author:  Gio [ 05 Feb 2017, 11:10 ]
Post subject:  Re: LM3886 + JFET Phono

Hi - yes, that will work as you have shown. What are you using as a power supply for the chipamps? You could also replace the batteries with a regulator and take power for the phono preamp from the chipamp. But batteries are a good choice for a phono stage.

Author:  Nimrod216 [ 06 Feb 2017, 04:10 ]
Post subject:  Re: LM3886 + JFET Phono

Hi Gio,
Can you point out a good regulator for the phono stage?
will probably use something similar to this design:
Image

Author:  Geek [ 06 Feb 2017, 05:37 ]
Post subject:  Re: LM3886 + JFET Phono

That's not for the LM3886, is it? :eek:

Author:  mwhouston [ 06 Feb 2017, 06:13 ]
Post subject:  Re: LM3886 + JFET Phono

Funny enough laptop switch mode chargers are rated at 150W. You made need two for the differential PS but its possible. Not a way I would normally go but possible. Would believe my mates $13K CD playerDAC has an internal SMPS.

Author:  Geek [ 06 Feb 2017, 07:21 ]
Post subject:  Re: LM3886 + JFET Phono

SMPS are OK for class-A, but fall on their faces with high power AB designs. Ask JVC ;)

Author:  Gio [ 06 Feb 2017, 13:41 ]
Post subject:  Re: LM3886 + JFET Phono

Nimrod216 wrote:
Can you point out a good regulator for the phono stage?


Your chipamp will need a robust (high current) balanced (linear) supply. The phono amp needs a single sided supply at <25mA. For the RIAA I would suggest using a LM317 or a 7824 to get a regulated single sided supply from the chipamp PS. While batteries are also a good choice, the only drawback is that they are expensive in the long run.

What are you doing for the LM3886 supply?

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