Zeners in Series

Discussion in 'General Electronics Chat' started by vetterick, Feb 18, 2009.

  1. vetterick

    Thread Starter Active Member

    Aug 11, 2008
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    0
    Hi all, I am in need of some 24V 1 watt zeners, Radio Shack has some 12V 1 watters, seems to me they'd be OK to connect in series, see any problems?

    Thanks, Rick
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You can do it but what is your application?
     
  3. vetterick

    Thread Starter Active Member

    Aug 11, 2008
    35
    0
    Its just a replacement on a power supply for a heater, I can zip down to the shack, will save me a trip to Frys.

    Rick
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    It will be ok but a small increase of the ripple voltage across the zeners may occur due to increased series resistance (two zeners - two resistances in series).
     
  5. vetterick

    Thread Starter Active Member

    Aug 11, 2008
    35
    0
    OK thanks I'll head to the shack in the AM, its kinda a funny circuit, it has a 1A fuse in series with a 200K resistor and a 1n4007 bridge shunted by the zener, the zener shorted and the resistor took the entire 120V of course never blowing the fuse, I'm not sure what the fuse is supposed to protect.

    Thanks, Rick
     
  6. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    That is a correct design. :D

    Semiconductor are designed to protect expensive fuse so should definitely destroy first in order to protect the fuse.
     
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