Zeners in Series

Thread Starter

vetterick

Joined Aug 11, 2008
35
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
 

Thread Starter

vetterick

Joined Aug 11, 2008
35
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
 

mik3

Joined Feb 4, 2008
4,846
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).
 

Thread Starter

vetterick

Joined Aug 11, 2008
35
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
 

eblc1388

Joined Nov 28, 2008
1,543
, 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.
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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