In article ,
Brian Gaff wrote:
There is an old rule in DIY electronics. Your wonderful device works fine
when its a spiders web of bits joined by wire on a workbench, but as
soon as you put it into a case things start to not work quite right.

a rule of professional electronics is "First - check the power supply"

You might need a 'scope to do this properly - correct volts is necessarily
the answer.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle