I'm still working on it.
I don't known what's going on with Geocities, I can't even access the page myself! I need to fing a host for a few pics (my "going above 2.05V" post has also pics that are unaccessible either
)
As is, this circuit does not work. The Vcore regulator does not accept 5V in its VID inputs. It accepts 0V or open high impedance.
I added schmitt trigger - inverters (74HC14) in case it was the ramp-up or ramp-down that was too slow. Did not work either.
I need to buy some FET transistors and connect them to the VID inputs. I already have the inverters (74HC14) that will drive the FET. Injecting 5V to the gate of the FET makes it behave like a short to groung. Injecting 0V makes it behave like an open circuit. I am concerned about the transitions though (ramp-up and down). I may need to synchronize the Vcore stabilizer with the Vcore regulator. That will add some complexity.
I am not too surprise by your stable Vcore, Qaztaz. Some Athlon mobo have a quad phase Vcore regulation, that leads to very stable Vcore. Most PIII mobo have a single phase regulation, resulting in very ugly waveforms on the Vcore. I have some plots at home, I may post them if I fing a host. My Vcore varies by more than 0.1V, thats a lot for a Voltage of 2V.
All this is fun (at least to me
), but I don't have enough time! I have other projects (upgrading my truck with water injection, plus my un-finished basement), so it has being more than a month since the last time I messed up with computer hardware.