6 May
1999
6 May
'99
4:40 a.m.
> Flip flop should be easy too. This one looks
rather like an ECL logic gate:
>
> +V DC
> |
> <
> >
> <
> >
> |
> +--+--+
> | |
> (:) (:)
> | |
> A--+ +--B
> | |
> > >
> < <
> > >
> < <
> | |
> GND GND
>
> Pull A to ground. Lefthand neon lights. Voltage on right hand neon too low
to
maintain
discharge and it goes out. Same works for B - RH neon lights and
voltage at the common anode too low to maintain LH neon, which goes out.
Nope! If left is not list then there is no current flow across the
resistor. To ignite the left lamp a voltage (negative maybe 25V) would
have to be applied at A. To extinguish left a voltage of +25(or more) volts would have to be applied. Generally this kind
of logic is pulse
coupled using transformers or capacitors. Note a bistable was done in the
case mentioned with one Neon.
Doing ascii logic from telnet seesion is far to slow for me to give a
complete circuit.
Don't post a circuit yet - I want to think about the one-neon flipflop.
Theoretically possible, anyway - the two states are on and off (now why does
that sound vacuous?).
Philip.