papunblg
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A simple circuit using PIC16F84A behaving abnormal! I have built this circuit months ago, which is still working perfect. But I was trying to assemble the same circuit two days ago but a strange phenomenon had occurred.
The PIC runs only if I touch the Crystal body !
I reassembled the same circuit on two different veroboards, changed the crystal three times, changed those 22pf capacitors, changed the PIC16F84A but nothing happened.
Everything working fine if I use a RC oscillator (from OSC1 pin a 10k resistance to positive supply and a grounded 22pf ).
The same PIC16F84A running perfectly on the old circuit board that I have assembled months ago.
Any idea!
The PIC runs only if I touch the Crystal body !
I reassembled the same circuit on two different veroboards, changed the crystal three times, changed those 22pf capacitors, changed the PIC16F84A but nothing happened.
Everything working fine if I use a RC oscillator (from OSC1 pin a 10k resistance to positive supply and a grounded 22pf ).
The same PIC16F84A running perfectly on the old circuit board that I have assembled months ago.
Any idea!
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