New Problem - mosfet boost vero

[upspoon12]

Hey guys,

Managed to get it working the proper way it should be, however now when the circuit is engaged, it makes a SUPER high pitch whining electric whirring sound. constantly when the pedal is engaged.

Any thoughts on what this might be?

original thread:

http://www.diystompboxes.com/smfforum/index.php?topic=108913.0

Thanks in advance again you guys are awesome!