[RE: VCOs]

[Haible Juergen]

	>As long as the threshold margins are constant, I don't care about
	>amplitude.  The schmitt's are quite fast, you have to pay for that
with
	>temp and supply variation (via supply you could adjust the
amplitude).
	>The temp error can be a problem for large temp variations
(thermostat ?).
	>
	>If the drive capabilty is nut sufficient one could add a switching
tranny
	>instead of diode, like I proposed.

There must be something to CMOS thresholds. ARP used a 4011 for the
threshold in the Odyssey - can't be that bad, then. Lot's of discrete stuff
around that, including a p-channel FET to buffer the saw wave and discrete
monoflop and discharge transistor - but in the midst of all that a 4011A
gate to detect the threshold !

JH.