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Old 16th January 2007, 07:52 AM   #1
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Default zener diode high performance

Hi everybody!

I would like to know where i can get high performace zener.

i'm searching for a very low noise zener diode.

As for example Caddock or vishay manufactr not inductive resistors, i would like to know who makes very high quality zener diode.


Hope to receive advice.


Best Regards,
Stefano.
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Old 16th January 2007, 08:11 AM   #2
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Never heard of a high-performance zener.

The standard ones seem to be used pretty much everywhere with little or no complaint...the tricky part likely being in how you filter it.
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Old 16th January 2007, 08:18 AM   #3
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well, as there are high grade resistors, capacitor, bridge rectifier.....and so on..... there are high grade zener.
Those zener have better performances due to a sharper knee and straigther characteristic and lower noise.

The only problem is that i don't know the name of the manufacters that make those components.

Hope somebody can help.


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Stefano.
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Old 16th January 2007, 08:29 AM   #4
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A LM329 is quite OK if you can use 7 volts.
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Old 16th January 2007, 09:19 AM   #5
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the voltages that i need are:

10V ; 6,2V
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Old 16th January 2007, 09:23 AM   #6
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Can you tell me the circuit they will be in? Maybe you don't need anything special

By it's nature zeners are noisy so if you really need a quiet zener like part you may look for other solutions.
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Old 16th January 2007, 09:23 AM   #7
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would resistor divider help?
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Old 16th January 2007, 09:59 AM   #8
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ok thanks for the advice.

The zeners would go:

as stab on the base of a npn in configuration current sink on the tail of the input differential stage.


The point is that i would like to re-place this part on my amp (electrocompaniet).
As far as i know there is an upgrade available from the company that involves the upgrade of this zeners (and also other parts).

That's why i'm searching zener to go on my amp's board that are higher quality.

as i said i would need a 10V and 6,2V
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Old 16th January 2007, 10:02 AM   #9
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Remember that the noise in this stage is created by the input transistors, not the current source. What you can do is to filter the noise. Check out here. Look at R6, C4 and C6.
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Old 16th January 2007, 10:04 AM   #10
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yes, thanks for the explanation.
But in that point a stable zener would contribuite a more linear stage (because the current mirror would be more ideal).

another zener is placed on the source of an differential stage.
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