Archive of the former Yahoo!Groups mailing list: MOTM

----- Original Message -----
From: thomas white <djthomaswhite@...>
and the rub on poly Hendry and Bradley use. Looks
easy enough. Anything I should look out for guys?

--LH--
Very runny -- like water. I use 3 or more coats applied
sparingly. I apply with a rag. Watch out for lint and
other stray particles. Great stuff. Almost impossible to
get a run.

--TW--
VU Meter, Mouser used to sell a (15v)-(0)-(+15v) DC model for a pretty
penny. Would be great to patch into this and see what happening with
voltages. Anybody ever used one of those automatic voltage LED displays that
uses red read-out to display voltage (like an alarm clock style letters) I
see these but have no experience with them and think it would be neat to
have the VU meter on the front of the controller to be digital red read-out
with a + or - on the display to indicate polarity. Maybe the response time
would be more accurate over a moving coil vu?

--LH--
I have been playing with this in a couple of ways.

1. I like analog meters. Instead of a hard to find expensive center
off meter, I was considering a 0-15 VDC meter. Use a op amp
circuit that returns the always positive value and let LEDs indicate
polarity -- maybe a bi-color.

There would be either two input jacks (one AC and one DC) or a
switch for AC / DC. For metering the AC side, the signal would
again be always positive for the meter, but the gain of the amp would
be set to provide a constant number that displays the peak-to-peak
AC value since that is what we normally use for discussing the size
of these signals.

2 - Something similar using the bar/dot LED driver chips instead of the
analog meter. Faster response time, but maybe not near as cool looking.
Takes less space. I think you could get two monitor channels on a 1U
panel. Analog meters would take 2U panel. Each channel should have an
IN jack and a parallel THRU jack so you can monitor in service voltages
without using a mult.

--TW--
Ribbon Controller: Ribbons ribbon ribbons, whos got the ribbons? Will be an
easy design if we can just find the ribbons. Range pot and threshold pot for
the gate out?

--LH--
ah... the robbons. I looked into the tactile and pressure stuff. Looks
like
you need a uP to read it. Too much for my small brain. I did actually
purchase some material for my my ribbon prototype (which I have had
zero time to work on). It is a very finely woven copper mesh tape about
1" wide and very thin and flexible. It reminds me of the mesh feel on my
MicroMoog. This conductive mesh would ride above my resistive element.
and could be pressed down at any point. I am stuggling with the mechanical
issues of how to attach the mesh (it does have adhesive on one side) so that
it can spring back up after pressing. I have some things that work, but
nothing I consider reliable over the long term.
Any thoughts? Opinions? Ideas?

Larry