Neil,
     You are probably right on the mark here. Automobile electrical=20
systems are very dirty. I would put a large value electrolytic cap on=20
the input of your board. Make the voltage rating anywhere from 150 to=20
200% of the incoming voltage. This would be between 25 and 30 volts. The=20
capacitance should be about 1000uFD for each amp of current draw. I=20
would use at least 2000uFD. Also use a 0.01 to 0.1 uFD cap on the input.=20
Mount it real close to the large electrolytic cap. What is the small=20
resistor for?
Thanks,
rich!

On 10/26/2014 7:17 PM, Neil wrote:
> Hi all,
>
> Have a product working very well for a long time on the bench, but in a
> truck I'm getting EEPROM data corruption.  Only real difference is the
> power source.  Is this possible?  I switched to an external EEPROM and
> haven't tested on the truck yet, but thought I'd ask in the mean while.
>
> My power supply is fairly basic --  reverse protection diode, small
> resistor, 8V regulator, then 5V regulator.  0.1uf caps on the input and
> output of the regulators.  Total current draw is 60mA.
>
> Cheers,
> -Neil
>

--=20
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