Today's Message Index:
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1. 05:02 AM - Re: Transistorture (Robert L. Nuckolls, III)
2. 05:11 AM - Re: 'Scope offer from Saelig (Robert L. Nuckolls, III)
3. 11:10 AM - Re: Transistorture (Fiveonepw@aol.com)
4. 09:14 PM - Re: Transistorture (Don Vs)
Message 1
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Subject: | Re: Transistorture |
At 07:46 PM 11/10/2006 -0500, you wrote:
>In a message dated 11/10/2006 8:47:51 AM Central Standard Time,
>nuckollsr@cox.net writes:
>The schematic helped. See attached .pdf
>
>Amazing- once again you have taught and assisted beyond all expectations-
>circuit B puts LED supply to ground potential for the big turn off! This
>is too cool- lots of uses for this, time ta git busy (gotta figure out
>packaging)... 8-)
>
>THANK YOU SIR!!!
You're most welcome. Consider "potting".
Small circuits like this can be simply
spider-webbed together, checked for function
and then potted in epoxy using just about
any form of the right shape and volume.
Since the epoxy offers the structural
integrity, the enclosure need only hold things
in place until the epoxy sets up.
bundle the wires and put a sleeve of heat
shrink over them so that there is some
bend relief offered by the shrink where
the wires exit the epoxy.
Avoid fast setting epoxies . . . all epoxies
warm up and the large volume applications
using fast epoxy may get so hot as to boil
over. Get some long pot life stuff, 30 minutes
or more and it will probably work just fine.
Once your circuit is suitably ensconced in
plastic, you can bond a mounting plate to
the bottom with E-6000.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
Message 2
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Subject: | Re: 'Scope offer from Saelig |
At 07:58 AM 11/10/2006 -0800, you wrote:
>
>Thanks Bob,
>
>We're thinking of getting some of these where I work for field techs.
>Might get one to try out... Lots cheaper than the Teks, or the Fluke
>196c that I have :}
>
>/Joe
Depending on your budget, the OWON may be an excellent
option. Don't forget ebay either. I have some folks at
RAC and their kids who take Saturday morning classes
I've taught out at WSU. A 'scope is one of those dead-nuts-
simple ways to help people visualize the dynamics of
circuit operation. I've been able to pick up perfectly
serviceable 'scopes off ebay and fit them with new
probes for under $150 total. I've acquired the occasional
really nice one for under $250.
While a 'scope is generally way down on the list of
tools for the hobbyist, I've found it useful to push
for early acquisition. With access to the 'scope,
some of these kids are acquiring a hands-on, real-time
visualization of circuit dynamics They're getting an
introduction to range and domain graphical analysis
even before they take algebra or calculus.
When their teachers throw those concepts up on the
board in coming years, the kids with the 'scopes will
have an immediate and solid understand of the concepts
and the utility they offer.
Bob . . .
Message 3
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Subject: | Re: Transistorture |
In a message dated 11/11/2006 7:05:12 AM Central Standard Time,
nuckollsr@cox.net writes:
Consider "potting".
Got it, thanks again!
Mark do not archive
Message 4
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Bob,
I would like to use a transistor to convert a normally open switch to
normally closed. I need to switch a circut ground off. This would be very
simple with a relay, but, I would like to use a transistor if this can be
done. Is this a reasonable approach? If yes can you draw me a diagrtam?
Thanks.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Robert
L. Nuckolls, III
Sent: Friday, November 10, 2006 6:43 AM
Subject: Re: AeroElectric-List: Transistorture
At 08:32 AM 11/10/2006 -0500, you wrote:
>In a message dated 11/10/2006 7:16:37 AM Central Standard Time,
>nuckollsr@cox.net writes:
>Who did you talk to there? Was it on phone or by e-mail.
>
> >>>
>Request was made by phone to John (dangit, do not recall last name) and
>attached .pdf sent via e-mail in reply. Will monitor list to see if
>attachment gets through, if not, will e-mail direct.
>
>Thanks!
>Mark do not archive
The schematic helped. See attached .pdf
All parts are available from Radio Shack. You can wire
two ways. One version turns LED ON when servo signal high,
the other turns it OFF.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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