This is a CD4049 inverter running on a 5 volt supply.

The lower trace is the signal out of the upper 2nd gen CAS
at a 50 ms period. That tranlates to 1200 RPM.

One side of the CAS is grounded to the 5 volt supply.

It still works at 100 ms or 600 RPM. It is just ticking over:)

A couple of bias resisters will allow it to work much lower than that.
The scope has a hard time working that slow. I need my other
digital scope to go that slow :)

This is only one of the 6 buffers in this chip.

Paul Lamar

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