[Context is filtering on inputs from switches.]
Could somebody tell me why we are doing anything fancy at all? What's wrong
with just a simple pullup?
I can think of two cases that might be interesting.
One is signal integrity. There might be enough crosstalk to cause troubles.
This is a
Hal Murray wrote:
[Context is filtering on inputs from switches.]
Could somebody tell me why we are doing anything fancy at all? What's wrong
with just a simple pullup?
Pull down required because of thumbwheel switch encoding.
I can think of two cases that might be interesting.
One
Magnus is on vacation and has some (net) connectivity problems. I would
expect him to be back online within a day or two.
--
Björn
On Wed, 2008-07-16 at 18:27 +0100, David C. Partridge wrote:
I'm waiting to see what Magnus Danielson has to say, as it was he after all
who suggested adding
David C. Partridge wrote:
I'm waiting to see what Magnus Danielson has to say, as it was he after all
who suggested adding caps in parallel to the pull-downs, and also series
resistors.
Thinking about it retrospect, I think he may have meant the series resistors
to go between the pull-downs
The Noritake display looks great.
I am hoping that a kit of this proposed Thunderbolt monitor with the
Noritake display will be made available through TARP in the near future. I
am sure that many of the Thunderbolts which recently became available would
benefit from such a kit.
Jeff
-
One issue with the Noritake display (common to all VFD devices) is that it
draws over 100mA of current at 5V. A 3 terminal linear regulator running
from 12V will need a reasonable heat sink to operate. A better choice would
be a small switching regulator such as the LT1375 which I have used in a
Regarding the VFD display, although they may be very different one manufacturer
to another, I can definitely dispute a prior statement made that VFDs in general
have a short lifetime and become dim. They are universally used in VCRs, DVD
players, microwave ovens, and some clocks. I have never
Yeah, those Noritake parts are very nice. I wouldn't expect trouble from
one.
There is a slight possibility of additional EMI versus an LCD, obviously
nothing that would cause trouble at the end of an RS232 cable.
-- john, KE5FX
-Original Message-
From: [EMAIL PROTECTED]
On Jul 16, 2008, at 10:46 PM, Didier Juges wrote:
One issue with the Noritake display (common to all VFD devices) is
that it
draws over 100mA of current at 5V. A 3 terminal linear regulator
running
from 12V will need a reasonable heat sink to operate. A better
choice would
be a small
My preference is usually to have a voltage regulator on the board where the
expensive electronics is, simply because I use adjustable bench supplies
for testing and I also own and use a large number of 9 to 12V wall warts
such that I have blown great many parts by inadvertently putting 9 or 12V
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