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Old 29th March 2001, 02:56 AM   #1
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What is a good voltage and current rating for back to back zeners protecting the input of a balanced amp? 9.1v, 10v, 20v?

I'm trying to protect the input of the Hoffman 2 stage SE amp. Any suggestions?

thanks,

Vince
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Old 30th March 2001, 01:20 PM   #2
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Default Zener Values for Input Protection

Hi Vince: A short while ago I posted the same question. The answer I received (I think it was from Robert Pear?) was back to back 5v 500mw zener diodes. I was asking about unbalanced RCA inputs, but I can't imagine that the requirements for unbalanced input would be much different.

Anyone know otherwise?
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Old 30th March 2001, 02:02 PM   #3
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Default Zener Values

I know that it's need to protect the gate, because it can't exceed a gate voltage of 20v. I don't know if it's suppose to be close to that value or less, so it never reaches 20v.

Thanks for the response Eric.
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Old 1st April 2001, 05:37 PM   #4
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If you go to http://www.passlabs.com and check out the schematics of preamps/poweramps (service manuals), you will find a sutiable value and probably industry part number as well. Typically, such diodes are 9.1V, but it would depend on the application and also how they are connected.
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Old 1st April 2001, 07:30 PM   #5
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Yeah, I have a few of the manuals. What confused me was that the input for the Zen amp was 9.1v then changed to 20v for protection. The Aleph 4 is 9.1v. I guess I'll go w/ the 9.1v because I'm working on a 2 stage, like the Aleph.
I guess I'm looking for the voltage to start protecting. Like you said, the application.

Thanks Petter
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