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voltage drop

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blessbernie

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after putting my PIC in d socket, d voltage from the 7805 drops to abt 1.4v. wat could be the cause. urgent plz. it's jst a simple temperature sensor circuit
 

crutschow

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Most Helpful Member
Something is drawing more current than the supply can deliver.
 

alec_t

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Carefully examine your circuit to see if there are any stray wire strands or solder splashes causing a short-circuit somewhere.
Double-check the circuit you have built, to ensure it's consistent with the schematic.
 

spec

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Or the 7805 could be misbehaving- perhaps oscillating. Have you got any decoupling capacitors across the supply lines. If not try 100nF.

spec
 

MikeMl

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Nigel Goodwin

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I would strongly suspect you've put the chip in the wrong way round! :D

This would produce exactly what you're getting - the chip will also be getting red hot, so don't touch it.
 
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