Hi Harry,

Certainly sounds like a simple solution alright.

How do PIC's cope with just a zener as the supply regulator  ... is that 
likely to compromise it's health or longevity?

Regards,  Roger


----- Original Message ----- 
From: "Harry H. Arends" <h.arends@home.nl>

>>
>> And also the supply. From the data sheets I see that 5.6
>> volts is too high.
>>
>> I may just be showing my ignorance  ...  but if this other
>> microcontroller has worked for 20 years with such a crude
>> supply (5.6volt zener and a cap), is it possible that a 5
>> volt shunt regulator could be used  ..  (is there such a
>> thing?) ... to keep it safe.
>

Or just a simple diode in series. There wil be a 0.6 volt drop over the 
diode resulting in 5 Volt

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