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Topic: question about Regulater 5V 7805 (Read 452 times) previous topic - next topic

TTU.ABD

Apr 14, 2013, 05:21 pm Last Edit: Apr 14, 2013, 07:08 pm by TTU.ABD Reason: 1
When I the connect the output voltage of regulater 5V to pic , the voltage drop to half , why?

retrolefty


When I the connect the output voltage of regulater 5V to pic , the voltage drop to half , why?



Go ask the pic people, arduinos don't do that.  ;)

afremont

If the regulator gets real hot at the same time, then it is overloaded and folding back the voltage.  Otherwise, if you don't have the appropriate capacitors on the input and output, it could be oscillating.
Experience, it's what you get when you were expecting something else.

outofoptions

#3
Apr 14, 2013, 07:29 pm Last Edit: Apr 14, 2013, 07:32 pm by outofoptions Reason: 1
Are these the actual measured voltages?

Does the LED pass enough current for the regulator to work?

oric_dan

OP's schematic showed up in a belated fashion. Someone tell him how to measure voltages.

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