Re: [TR] gas gauge and voltage regulators

[Dave <dave1massey@cs.com>]

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Polyfuses are cheap.  As I said, not as simple as a single polarity regulator 
but it can be done.  I just had a thought of how to do it with only one zener 
and using the spare opamp gate as a conditional inverter but that adds still 
more complication.  The rest is left to the student - as my textbooks used to 
say.
 

 

Dave Massey


 

 

-----Original Message-----
From: Randall <TR3driver@ca.rr.com>
To: triumphs <triumphs@autox.team.net>
Sent: Sat, Jul 4, 2015 3:03 pm
Subject: Re: [TR] gas gauge and voltage regulators


> Here you go.  This will work with either polarity equally 
> well (or poorly
but then how accurate are the instruments 
> anyway). 

Very clever.  But I
would still call that two separate regulators (ZR1 and ZR2), you've just added a
voltage follower to the output.
:)

No over-current protection either.

--
Randall  


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<font color='black' size='4' face='Arial, Helvetica, sans-serif'><font 
size="4">Polyfuses are cheap.&nbsp; As I said, not as simple as a single 
polarity regulator but it can be done.&nbsp; I just had a thought of how to do 
it with only one zener and using the spare opamp gate as a conditional inverter 
but that adds still more complication.&nbsp; The rest is left to the student - 
as my textbooks used to say.</font>

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<div style="clear:both"><font size="4">Dave Massey</font><br>

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<div 
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original 
Message-----<br>

From: Randall &lt;TR3driver@ca.rr.com&gt;<br>

To: triumphs &lt;triumphs@autox.team.net&gt;<br>

Sent: Sat, Jul 4, 2015 3:03 pm<br>

Subject: Re: [TR] gas gauge and voltage regulators<br>

<br>




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<pre style="font-size: 9pt;"><tt>&gt; Here you go.  This will work with either 
polarity equally 
&gt; well (or poorly
but then how accurate are the instruments 
&gt; anyway). 

Very clever.  But I
would still call that two separate regulators (ZR1 and ZR2), you've just added a
voltage follower to the output.
:)

No over-current protection either.

--
Randall  


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