i need 0-60V/10A regulator tegangan DC

[garg29]

Refrence voltage of ADC

I'm using PIC16F688 controller to measure a analog voltage. The problem is my supply voltage is 5.04 volts instead of 5.00 volts ( the power supply is simply based on 7805) which varies the refrence voltage of ADC.This creates a error like if ADC output should be 730 it will give 735 with 5.04 volts reference, & from piece to piece of 7805 this supply voltage varies from 5.01 to 5.06. How can I handle this problem ? All other pins of the uC are reserved.

Thanks in advance,

Regards,
Garg

 

[IanP]

Re: Refrence voltage of ADC

Try to change the voltage regulator from 7805 to 317 (or 317L if you expect the current consumption to be below 100mA) and adjust the supply voltage to exactly 5.000V ... see picture below ...
With 120Ω for R1 and 360Ω for P the output is ≈5.000V, so for very fine adjustment you can use 330Ω fixed resistor and 50Ω multiturn-pot ...

Rgds,
IanP