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zener diode 12vdc to 6vdc
#100882 Fri May 25 2007 09:10 PM
Joined: Jul 2005
Posts: 597
1
Shop Shark
guys, will a nte 5118A 6V 5W zener diode work for my 50'AD gas gauge? i'm told 2W will work so will higher wattage rating cause a problem? thanks. grin

Re: zener diode 12vdc to 6vdc
#100883 Fri May 25 2007 09:57 PM
Joined: Jul 2004
Posts: 5,697
A
Master Gabster
10 micron,

There was a post several weeks ago with some calculations for operating a 6 volt fuel gauge on 12 volts (OlBlue). His math showed 2.71 watts on 12 volts. To my limited knowledge, using a higher rated resistor or diode (watts) won't cause any problem...it's like using a heavier extension cord when your trimming the hedge.

Edit. Doesn't the voltage rating of your diode have to be at least that of your intended input voltage?

Edit/Edit. I just found a little Zener selector chart and put in values that would represent a voltage drop from 14.0 volts to approximately 6.0 volts. The diode you spec'd popped up! This tells me one important thing...I don't know a darn thing about this kind of stuff. grin

Stuart

Re: zener diode 12vdc to 6vdc
#100884 Fri Jun 01 2007 12:01 AM
Joined: Jul 2005
Posts: 597
1
Shop Shark
the one i found on ebay for fuel gauge's are .4amps at 12v. says each gauge needs seperate one. for the wiper motor you need a 1.5 ohm ceramic resistor. they claim the ceramic resistor will run a heater blower at 4amps/25 watts max.

Re: zener diode 12vdc to 6vdc
#100885 Tue Jun 05 2007 01:11 AM
Joined: May 2002
Posts: 155
S
Shop Shark
The heck with ebay...just go down to your local
electronics store or even (shudder) radio shack...
I know there are a couple of good ones in the sea-tac area...


Geoff


68 GMC 3800
56 JD420C w/JD90 Loader
Re: zener diode 12vdc to 6vdc
#100886 Tue Jun 05 2007 01:48 AM
Joined: Jul 2004
Posts: 5,697
A
Master Gabster
It's time again to put my foot in my mouth. I am not sure I understand this 'Zener diode' deal. I think I know what a diode does, and I think that the special Zener diode will conduct current in the reverse direction when the voltage reaches a critical peak...isn't this what sets a Zener apart from a standard diode.

Every poop sheet I have seen that showed how to make a small voltage reducer using a Zener diode also included a small resistor in parallel (I think). How can a diode reduce voltage...I thought a diode was a one way gate so to speak.

Stuart

Re: zener diode 12vdc to 6vdc
#100887 Tue Jun 05 2007 04:23 AM
Joined: Mar 2005
Posts: 1,029
B
Member
A zener in series with the load will pass everything higher than its zener voltage. If you had a six volt zener with a twelve volt system, typically 14.3 V while charging, you would see 8.3 V at the load. A current limiting resistor in series with the load, with a six volt zener to ground between the resistor and the load, would present six volts to the load.

Re: zener diode 12vdc to 6vdc
#100888 Tue Jun 05 2007 04:32 AM
Joined: Jul 2004
Posts: 5,697
A
Master Gabster
Wow, that was easy...thanks Baldy! I must have been absent, or in reform school the week they taught this at the asylum. smile


Stuart


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