[sdiy] 555 vco (electronotes)

[TheMysticSatin]

Has anyone out there built the 555 based "Dirt Cheap Utility" VCO from
electronotes #67 and can give me any troubleshooting pointers, especially if
there are common problems or critical areas that might need fine tuning as
far as values.  This is my first VCO... what else can I say?  Any general
555 timer VCO tips would be appreciated as well.
Thanks in advance
Gavin