<Ok, one step closer. The description of core in the PDP-8/a miniprocessor
<users manual shows the wires going straight through the cores. Is this
<correct? I'd expect the wire to make one or two turns around the core so
<that the magnetic field it induced would be "inside" the torroid. Comments?
So it's a fraction of a turn. There are reasons for not doing multiple
turns. One being the size of the wire. another is adding turns increases
the inductance of the "coil" and with literally hundreds of "coils" it
would be very hard to get a good switching waveform.
<What about driving voltages? I've got a +/- 36v _at_ 3amps supply here, the
<PDP-8 uses its 15 volt supplies. I'm building a simply push-pull direct
<coupled amp out of a couple of transistors to send the signal that Allison
<drew. I'm using a Parallax BASIC Stamp to generate the waveforms (I could
<use the HP but then it wouldn't be portable)
It's current driven through the wire that is important.
<Sense wire? Straight through the core or also with a wrap?
Same as core plane.
Actually for testing you could used a turn or two for the driving wire and
the sense wire to make life easier(less drive, bigger signal) but for
multiple cores you need to do the matrix as fractional turns.
Allison
Received on Sat Apr 24 1999 - 17:04:10 BST