Hiya, So I built up a Thomas Henry 4046 VCO and ran into an issue: the frequency out is way too high, starting at 55KHz and going up to 175KHz. I checked my schematic and it all looks good except for one thing; I am using a 74HC4046 instead of a CD4046. Is that causing my problem? -- --Tim Ressel Circuit Abbey timr at circuitabbey.com