Author Topic: zener diode  (Read 791 times)

Offline Tumbleweed

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zener diode
« on: 17.07. 2014 19:59 »
hi , again everybody ,  i have a zener diode in my box of tricks , i wonder if anyone can tell me a simple way to find out if it is neg earth or poss earth, as there are no markings on it and pretty expensive for a new one        thanks  tw
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Offline a10gf

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Re: zener diode
« Reply #1 on: 17.07. 2014 21:52 »
A little offtopic, but interesting > http://en.wikipedia.org/wiki/Clarence_Zener
More: http://en.wikipedia.org/wiki/Zener_diode

Am learning about 'quantum tunnelling' and 'avalanche breakdown'  lol+++

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Re: zener diode
« Reply #2 on: 17.07. 2014 21:55 »
Maybe try 2 x 12v bulb in series and 2 x12v battery in series to see which way it conducts?
New Zealand

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Offline duTch

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Re: zener diode
« Reply #3 on: 17.07. 2014 23:06 »

 Kiwi, why two of each....?
 Maybe you could just do the same with a multi meter...?
Do they come with different voltage ratings..?
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Offline wilko

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Re: zener diode
« Reply #4 on: 18.07. 2014 00:22 »
If it's an original  Lucas one they were only ever positive earth.

Offline Tumbleweed

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Re: zener diode
« Reply #5 on: 18.07. 2014 09:07 »
thanks everybody , it has lucas stamped on the spade connection so it must be poss earth , thanks again .   tw        ps    that tunnell is a bit too deep for my liking a10gf
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Offline a10gf

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Re: zener diode
« Reply #6 on: 18.07. 2014 09:43 »
"Either the Zener or the avalanche effect may occur independently, or both may occur simultaneously"
and it seems "minority carriers" are involved.

That should clearly explain it   *smile* +++

(Sorry for the offtopic)

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Re: zener diode
« Reply #7 on: 18.07. 2014 10:33 »
heh dutch, zeners have different voltage ratings but for bikes will be designed for 12v regulation albeit there might be one out there for 6v i suppose.

As a zener for 12v regulation would not conduct until over 12v was reached by the genny you need more than 12v to test it.......I think.

New Zealand

1956 A10 Golden Flash (1st finished project)

1949 B31 rigid “400cc hot rod” (2nd finished project, + favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, project missing parts, mission impossible?

GL1800 Goldwing, well, the wife likes it

KTM 950 ADV, cos it’s 100% nuts

1952 Armstrong Siddeley Whitley for rainy days (with wife

Offline Tumbleweed

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Re: zener diode
« Reply #8 on: 18.07. 2014 12:48 »
i think you are too far in the tunnell  a10gf , i hope you get out ok  *smile*      tw
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Offline duTch

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Re: zener diode
« Reply #9 on: 18.07. 2014 13:35 »

 Ta Kiwi, is just 'cos I don't know if the early unit-const jobbies were 6v, or 12v....or even if they use the same regulation system.
   Other than that, apart from what I read in a10gf 's wiki post that they do flow reverse, I know just a little more than enough to be dangerous... *eek*
 
   a10gf, stay outta those quantunnels- wouldn't like you having an avalanche breakdown- never know where you'd end up...!
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia