Arfa Daily wrote:
That is the most important thing that you must do before going any further.
If not properly bypassed, 78 series regulators will *readily* oscillate
violently, particularly if you have long leads attached to them. Connect 0u1
between "in" and ground, and 4u7 in parallel with 0u1 between "out" and
ground. It is *essential* that these are soldered *directly* to the pins of
the device, not some distance away down the connecting wires.

Might as well add the back-bias protection diode with anode at "out" and
cathode at "in" while he's at it.

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