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Old 13th October 2006, 01:05 PM   #1
jarthel is offline jarthel  Australia
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Join Date: Jan 2002
Location: somewhere in Australia
Default very ignorant question on zener diodes

I have not used them before so...

is the side with the black ring the cathode? I have a feeling it is. But I do not want to blow it up as the value i'm using isn't available locally.

thank you.
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Old 13th October 2006, 01:17 PM   #2
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Location: Herndon Virginia
J,
That sounds right.

You sound rather raw at this, so I will go slow.

The band usually (99%) of the time is the K or Cathode.
That on the print is the flat part of the diode.

The Anode or A is the arrow head part.

A simple check if the diode is any good.

Let's assume it's a 12 volt ZD.

Place it in series with a resistance of 5k ohms, then across the whole thing run some voltage across it. Measure across the diode body and you should see the voltage the diode conducts at.

Later dude and good luck

Jack Crow in Kuwait
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