[Roadsters] Alternative to Bimetallic Strip Gauge Regulator?

[Ken.Smart at csiro.au]

For reference.

Those with long memories may recall Tom Walter's solid state voltage
regulator. I built one many years ago based on his specs.

A quick read of the Moss Motors PDF indicates that it drops the voltage to 10v
(unless I missed something )

Toms original post is copied below from the list archive indicates the need
for a voltage lower than 10 somewhere around 7-8v:

>From Tom Walter:
I am working on a solid state replacement but don't have a good unit to
compare with.

Charlie,

There have been a few versions of the solid state regulator made up.  I
posted the version below, to which Lou in Australia pointed out a LM7808
(fixed regulator) would have saved me a few resistors. ;-)

Barrie reported his roadster "liked" 7.3 volts, someone else cameback
with 7.6 volts, and my
car seemed to prefer closer to 8.0 volts for a fixed voltage to replace
the mechanically instrument voltage regulator.

Have fun!

Cheers,

Tom

wrote this a while back:

> For the voltage regulator, those electronic hobbyist
> on the list should be able to make a simple replacement.
>
> Parts list:
>
> LM317T (T0-220 package)
> R1 (out to adj pin)  220 Ohm
> R2 (adj to gnd)     1200 Ohm
> Diode (Voltage to in)  IN4007
> input cap           0.1ufd  (disc  60V is fine)
> output cap          1.0ufd  (tant. atleast 16V)
>
> For the circuit, look at a LM317 datasheet. Check the
> LINEAR Databook's (Motorola, National Semiconductor, etc).
> The diode just prevents reverse voltage spikes from damaging
> the regulator.
>
> Mount the heatsink tab with mica washers (pin 2 is connected
> to the tab). Output voltage is apprx 8V.
>
 > Note: I think the system, as a whole, was temperature
> compensated. The electronic regulator may cause the gauges
> to read a little higher when it is HOT outside (haven't
> investigated this).
>
> Everything should fit back inside the original case,
> keeping a stock appearance.
>
> For thosee who are NOT electronic hobbyist, it is still
> much simplier to replace the OEM unit with one from
> NISSAN (about $13).





-----Original Message-----
From: datsun-roadsters-bounces at autox.team.net
[mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Roy Haslett
Sent: Thursday, 29 March 2012 7:14 AM
To: Walter.Peterson; 'RWM'; 'Datsun Roadster List'
Subject: Re: [Roadsters] Alternative to Bimetallic Strip Gauge Regulator?

     Thanks for the great info everyone, my fuel and temp gauges have been
indicating a little low.  This part should do the trick.
Roy
67 low 1600
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