28 Apr
1999
28 Apr
'99
1 p.m.
At 06:40 PM 4/28/99 +0100, Tony wrote:
Incidentally, I believe that the HP9100B core address
driver is very
simple. Just a emitter follower (with a low-ish emitter resistor)
capacitively coupled to the address wire. This gives the required +ve and
-ve spikes when the transistor turns on and off.
That's pretty clever, what size cap?
I = Cdv/dt on the cap would allow for an arbitrary spike.
I'll wire this up tonight. I bought some ferrite cores from a local surplus
shop on the reccomendation of one of the core manufacturers and they have
two very nice attributes:
1) They are all consistent magnetically.
2) Their magnetic properties are well characterized so I can
relate theory to actual practice with fewer variables.
Note you those of you in school or headed there, even the most obscure
classes come in handy so PAY ATTENTION. :-)
--Chuck