Snafu! So here it is again, corrected and with the attachment.

wilf



You've described all direct Nu>Nv connections I can think of. There are
a few obscure ones worth mentioning.

6) The Nu R/C bias point can be used as a ramping analog source to
influence a Nv. A typical example using a diode is shown in the attached.
Note that the R of the Nu section must be much smaller than the R of the Nv.
The same methods of coupling as described in 1) to 5) can be used.

7) In suspended bicores, the Nvs are not referenced to ground or Vcc
however a Nu (including 6) can be connected to the middle of the suspended
resistor or directly influence one or both bias points.

The key to understanding the way the suspended bicore is influenced by
an external voltage/current source is to recognize that the null (minimum
influence) voltage for a suspended bicore is Vcc/2. This means if Vcc/2
is connected to the midpoint of the resistor in a HC suspended bicore with
equal capacitors, there is zero effect.




-----Original Message-----
From: Bruce Robinson [mailto:Bruce_Robinson@...]
Sent: Sunday, February 10, 2002 10:37 PM
To: beam@yahoogroups.com
Subject: Re: [beam] advanced beam


Evan Dudzik wrote:
>
> In Living Machines, MT slaves Nv neurons to Nu
> Neurons.. anyone know the hookup, etc. for doing that?

Hi, Evan.

Whenever I've slaved an Nv neuron to an Nu neuron, I've used a resistor
between the Nu output and the Nv bias point (where the cap, resistor,
and inverter input all join). You can do this several ways ...

1) The connecting resistor is much larger (at least 4 times the size)
than the regular Nv resistor. This will influence the Nv timing a
little, increasing or decreasing the delay depending on the Nu output.

2) The connecting resistor is approximately the same size as the regular
Nv resistor. This will make the Nu the predominant factor in the Nv
timing.

3) Use only the connecting resistor and eliminate the regular Nv
resistor. This means the Nu will switch the Nv between a grounded neuron
and a positively connected neuron.

4) Use a diode between the connecting resistor and the bias point.
Depending on the output level of the Nu and the direction of the diode,
this will either speed up or slow down the Nv delay.

5) Use a diode between the Nu and the Nv bias point. The Nu will then
either kill a process on the Nv, or inject a new one. This is the
original Tilden startup circuit.

And I'm sure there are more ...

Bruce