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DJ
Joined: 22 Jul 2004
Posts: 118
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 02 Sep 2004 22:41 Low noise voltage regulator |
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Any sugestion of very low noise voltage regulator for VCO applications?
D.J
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 02 Sep 2004 23:10 Re: Low noise voltage regulator |
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| You can make your own with a low noise op amp and a JFET series pass element. Put large amounts of capacitance across the reference.
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FANT
Joined: 27 Feb 2002
Posts: 333
Helped: 9
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| 02 Sep 2004 23:42 Re: Low noise voltage regulator |
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Used with great satisfaction the old 723 ( no noise at the output ).
Don't use in any way the 78 series, about 2 mV p-p wide band noise with any output capacitor ( at least from 1 nF to 1000 uF ).
Now I know the 723 is difficult to find, but for my VCO i use always it.
Mandi
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bomba
Joined: 09 Sep 2003
Posts: 136
Helped: 1
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| 03 Sep 2004 14:30 Re: Low noise voltage regulator |
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I'M INTERESTING TOO!!!!!!!!!!!!!
I see the ckts from old (7 years) presicion instrument and found that use the old 723.
Nothing more actual?
Best regards
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Jeekoky
Joined: 15 Jun 2004
Posts: 23
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| 16 Oct 2004 3:31 Re: Low noise voltage regulator |
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| flatulent wrote: |
| You can make your own with a low noise op amp and a JFET series pass element. Put large amounts of capacitance across the reference. |
"a low noise op amp and a JFET series pass element"? I don't know your means exactly. Could you explain in details?
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Regnum
Joined: 17 Jun 2004
Posts: 264
Helped: 12
Location: Hurlingham
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| 16 Oct 2004 5:06 Re: Low noise voltage regulator |
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| DJ wrote: |
Any sugestion of very low noise voltage regulator for VCO applications?
D.J |
...what current range ?
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cetc1525
Joined: 08 Oct 2004
Posts: 177
Helped: 3
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| 22 Oct 2004 16:21 Re: Low noise voltage regulator |
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| the zener of AD corp. is very low.youcan use cap. to filter .it decide you.
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