Quote:
Originally Posted by ms660
15MHz aside, I suspect your schematic needs altering.
EDIT: Just seen the circuit board, the ground plane will be one plate of various capacitors.
Lawrence.
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Thanks for reading the thread and for your feedback Lawrence, which makes sense. Likewise, the comment on the lack of an output coupling cap which could have been added to the PCB, (albeit the input to my counter has one). I guess the ground plane is both problematic and surplus to requirements.