Dwight Elvey wrote:
I have a schematic for the separator used on my
Polymorphic
computer. It uses another hard to get VCO chip. It uses
a MC4024, an external charge pump, 96L02 oneshot and
a few more TTLs.
Brad Parker wrote:
I thought that since it was not pll based, that sort
of data separator
was subject to drift
If it's a typical design, the VCO and charge pump are used as part of a
PLL. The MC4024 (note - NOT a CD4000 series CMOS part!) or SN74LS629
are the most common VCOs for "discrete" PLL data separator designs.
Neither is particularly hard to find in small quantities.
Eric