- Sun Apr 11, 2010 11:50 am
Sounds like its time to throw out the assumptions and re-test things in isolation.
try the 15v wall wart feeding just a 1k resistor. What is the voltage ?
can you try a 9V battery in and no load on the output of the 7805. What is the DC voltage ? Put your meter on AC and confirm 0V AC also (might be able to see if there is instability).
how about a close in photo of the wiring ?
This photo is how I usually hand wire a 7805. Leon is strictly correct with his values, but I have never had any stability issues using 2 x 100nF caps wired close in. The photos uses 2 x 100nF 0805 X7R ceramics.
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