secretagent
New Member
Hi I am using a PIC18f4550 and when I use a computer power supply to run it I get a slight input from the ADC when it is to ground... It doesn't do this and actually functions fine when it is connected to USB any ideas?
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Computer supplies can have a lot of noise.
A 1000uF capacitor may be ok for large ripple currents but it won't filter out some of the higher frequency components.
Make sure you have a few 0.1uf and maybe a 1uf ceramic capacitor between the power pins as close to the PIC as you can.