[Roadsters] Alternative to Bimetallic Strip Gauge Regulator?

[Pat Horne]

The voltage drop across a resistor is dependent on the current flowing 
through it. The current in this particular circuit does not stay 
constant, so just dropping the voltage would not work. As I recall the 
average voltage coming out of the instrument regulator is about 8V. The 
gauges are slow enough to react that a constant voltage will be good 
enough.

The reason for having a voltage regulator at all is that the battery 
voltage can vary quite a bit between idle and full throttle, not to 
mention head/driving lights on or off, causing the gauges to read off by 
quite a bit....not that the temperature gauge is known for being 
particularly accurate!

As for the 10V Moss regulator, if it is a bi-metal regulator, it can be 
adjusted to work. If it doesn't have an adjustment on it, the mount for 
the bi-metal strip or the strip itself can be bent to have more off time.

Peace,
Pat

Thusly spake Hall, Phillip B. (MSFC-EE11), On 3/28/2012 7:46 PM:
> Can you not just use a small 2 V resister on the output?
>
>
> On 3/28/12 7:44 PM, "RWM"<RWM at RWMann.com>  wrote:
>
>> Now that you mention it, Charlie, I recall that.
>>
>> I'm betting there is ~2V of additional voltage drop in a 40-year old
>> electrical harness and connectors...
>>
>> - Bob
>>
>>
>> On 3/28/2012 7:26 PM, Ken.Smart at csiro.au wrote:
>>> 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 )
>>>
>>>
>>>
>>>
>>> -----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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-- 
Pat Horne, Owner, Horne Systems
(512) 797-7501 Voice		5026 FM 2001
Pat at HorneSystemsTx.com	Lockhart, TX 78644-4443
www.hornesystemstx.com
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