• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

PIC based high-resolution cap meter

Hi,

I have changed all resistors. Now they are all 1%. The voltages are:

RA0 = 0,14V;
RA2 = 3,31V;
RA3 = 4,92V;
RB3 = 3,60V;

The comparator is not oscillating I have checked it with my oscilloscope.
 
Something is pulling RA0 down or it is floating.
Is RA0 connected to R5 and C2?
If connected, check any shorts from C2 to gnd.
If no shorts, C2 might be faulty.
 

gophert

Well-Known Member
Most Helpful Member
I have checked again pcb and now it works. Thanks at all for your support.
I appreciate you checking to let us know it works but is there any reason it started working? Nobody will laugh at you if it was a dumb mistake - we'll just laugh at our old memories of the time we made the same (or similar) mistake.
 

Latest threads

EE World Online Articles

Loading

 
Top