[TR] gas gauge and voltage regulators

[Dave]

Here you go.  This will work with either polarity equally well (or poorly but then how accurate are the instruments anyway).  It is more involved that the simple LM7810 (or LM7910) circuit but it will allow polarity switching, needs no reverse polarity protection and reduces inventory by one part.

Let me know if the attachment doesn't come through.

 

Dave Massey


 

 

-----Original Message-----
From: Dave <dave1massey at cs.com>
To: TR3driver <TR3driver at ca.rr.com>; triumphs <triumphs at autox.team.net>
Sent: Fri, Jul 3, 2015 7:54 am
Subject: Re: [TR] gas gauge and voltage regulators


 That sounds like a challenge.  Stand by.  ;-)   
    
   
   
    
   
   
   Dave Massey   
    
   
   
    
   
   
    
   
   
-----Original Message-----   
 From: Randall <TR3driver at ca.rr.com>   
 To: triumphs <triumphs at autox.team.net>   
 Sent: Fri, Jul 3, 2015 7:12 am   
 Subject: Re: [TR] gas gauge and voltage regulators   
    
    
     
> Electronics is polarity sensitive although an electronic 
> stabilizer
(regulator) can be designed to work with wither 
> polarity by including a full
wave bridge and retuning the 
> circuit to compensate,

Hmm, maybe I'm
missing something.  Seems to me that a full wave bridge wouldn't do, because the
senders have to return to chassis
ground.  The only way I can see to implement
this would be basically two complete regulator circuits with steering diodes so
only
one is functional.  

Lots easier to just use a circuit that matches the
car polarity, which is what the vendors do.  Eg Moss sells 131-555 for
negative
ground, and 131-556 for positive.

It's also pretty easy to build
one for yourself.  I used the can from an old stabilizer (with bad contacts)
similar to what's
shown
here
<http://bob_skelly.home.comcast.net/~bob_skelly/voltageStabilizer/voltageStabilizer.html>
But
there's no reason you have to use the can, it's just a convenient package (with
terminals).

If you want positive ground instead of negative, use a 7910
instead of the 7810, and switch the polarity of the capacitors.

-- Randall 



** triumphs at autox.team.net **

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