Alt-BEAM Archive
Message #11429
To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@telus.net
Date: Mon, 06 Mar 2000 23:13:23 -0800
Subject: [alt-beam] Re: nv's and nu's
--------------4BD30D9C384F9143FF1082E4
content-transfer-encoding: 7bit
Steven Dang wrote:
>
> I'm trying to figure out the difference in the schematics for a
> neuron in a nervous net and a neuron in a neural net...
Hi, Steve. Just happen to have (see attached) ...
> ... I know the differences in their purposes. A neural net is the brain
> that carries out thoughts, and the nervous net is the spinal cord
> that controls sensory and motor functions...
It's not that clear cut, I'm afraid. They are both useful in both
functions.
The basic Nv neuron responds to a rising input by switching it's
normally high output to a low one for a varying amount of time. Given an
input that goes from high to low to high again, on the low-to-high
transition, the output will go from high to low. After a delay
(determined by the resistor and capacitor values), the output will
switch back to high. This allows you to chain Nv neurons together and
have a signal travel slowly along the chain.
The basic Nu neuron responds to a prolonged change in input. If a high
signal is applied to the input, after a delay, the output will switch
from high to low and will remain low as long as the input stays high.
One essential difference is that the Nv responds immediately to an
input, and sends the output for a time duration: The delay occurs AFTER
the output is sent. The Nu responds to an input after a delay and sends
the output continuously. The delay occurs BEFORE the output is sent.
> ... But i don't know what the schematic of each of these are. Could
> someone clarify this for me.
See attached. The only difference between the two is that the capacitor
and resistor are swapped. Each one also has a variation where the
resistor (Nv) or capacitor (Nu) is connected to Vcc instead of ground.
I'll be interested to hear what the rest of the BEAM community has to
say about this (I'm taking notes ... watch for a future web page). Also,
any critique of the diagrams will be appreciated.
Bruce
--------------4BD30D9C384F9143FF1082E4
Attachment: anr_x_20-1_nv.gif
--------------4BD30D9C384F9143FF1082E4
Attachment: anr_x_24-1_nu.gif
--------------4BD30D9C384F9143FF1082E4--
11430 Tue, 7 Mar 2000 01:03:34 -0800 tiny limit switches BEAM = Richard Caudle =
Evening all.
I've been using these really small limit switches on my HPV's for tactile=
sensors, but I can't find a vendor. The ones that I've used have been gle=
aned from old CDROM drives. Anybody out there know where I can find these =
little critters?
Hi,
If you mean those little micro-switches I have some around that I can sen=
d off. Would need to solder on some wire extensions to the existing arms.
Joe
doodle@teleport.com
content-transfer-encoding: quoted-printable
>
x; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
----- Original Message -----
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black">
Fro=
m: =
Richard Caudle=
=
Sent: Monday, March 06, 2000 7:14 =
PM
Subject: tiny limit switches
Evening all.
I've been using these really s=
mall =
limit switches on my HPV's for tactile sensors, but I can't find a =
vendor. The ones that I've used have been gleaned from old CDROM =
drives. Anybody out there know where I can find these little =
critters?
Hi,
If you mean those little micro-switche=
s I have =
some around that I can send off. Would need to solder on some wire extens=
ions =
to the existing arms.
Joe
face=3DCourier>doodle@teleport.com
Home