14 Feb
2008
14 Feb
'08
10:51 p.m.
Hi,
The bias for the cores is the power hungry thing -- so far. The DC
bias puts the AC bias to shame. My boss hopes for clock rates in the
.5-1 MHz area, whereas the iron cores I'm currently playing with might
top out at 20k. One of the silly little problems is that we can't find
reference to clean sinusoidal AC sources of AC above 20k in 1900. The
HF stuff in that era tended to involve spark gaps. My instant answer
was motor - generator sets, but that needed 3 phase input, and brushless
output ie. more like an alternator. I have visions of this thing
generating the kW's of AC needed, arcs all over the place, ozone
everywhere, and me trying to dynamically balance it at 6000rpm.
3 ceramic Tetrodes in a 3 phase amplifier would make it a cince.....
(which is exactly what Univac did) There were 4CX1000's in 1900
weren't there ?
Construction
is likely to be bit serial, and the target is 500k -
1000k bits per second through the loop, maybe an
instruction rate of
10% of that.
That's higher than I'd expected, especially in view of your
"20kHz is about the max available frequency" note.