boost guage and zener diode questions...

[Grant Lenahan]

As to zeners, for a 4.3v model, you will probably need to mail order 
from a major place like Newark Electronics, Chris Electronics or one of 
several other large supply houses.

Next, they are very directional. A zener is a diode, actually made from 
TWO diodes, that has a predictable breakdown voltage in the reverse 
direction. So it acts like an infinite resistor up to 4.3 volts, and 
then has no resistance. in theory.  Int he old standby water flowing 
analogy, its like a dam.  Keeps water back up to a certain level, then 
lets it flow over. What you are making is most likely a regulator or a 
voltage reference, or both.

Zeners have a dark band on one end.  That corresponds to the end that 
the triangle/arrow points TOWARD on the circuit diagram that (I hope ) 
you have.  It connects to "+".

You might also read here:

http://en.wikipedia.org/wiki/Zener_diode

Grant

On Jul 11, 2006, at 6:47 PM, tmb wrote:

>
> i ask cuz i finally got around to hooking up my
> aftermarket boost guage, and the numbers
> certainly are not jiving.
>
> in fact, they're not even consistently not
> jiving.  sometimes the digital guage will show
> 1.2BAR, and the new guage shows 3psi, while other
> times it may show 6psi.
>
> weird.
>
> oh yeah, zeners.  i'm not having much luck
> locating one.  i've got the 470Ohm resistor, now
> i need the 4.3V zener diode so i can do the
> robert myers ECU mod.  anyone?  i'm in canada, so
> US locations probably won't help me too much.
>
> maybe it's used in some cars somewhere?
> something i can yank out of old an ECU something?
>
> lastly, when doing the resistor mod, is there a
> positive and negative to the diodes that has to
> be followed?  as in, does the positive side need
> to be soldered to the motherboard, and the
> negative to the daughterboard?  or vice versa?
>
> thanks, everyone!!
>
> jason
> tmb
>
>
>
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