Today's Message Index:
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0. 12:19 AM - Just A Few Days Left; Still Trailing Last Year... (Matt Dralle)
1. 05:25 AM - Re: Crowbar Circuit (Robert L. Nuckolls, III)
2. 03:15 PM - Dan's Switches (messydeer)
3. 03:20 PM - Re: Dan's Switches (messydeer)
4. 03:28 PM - Re: Dan's Switches (messydeer)
5. 03:33 PM - Re: Dan's Switches (messydeer)
6. 03:49 PM - Re: Dan's Switches (messydeer)
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Subject: | Just A Few Days Left; Still Trailing Last Year... |
Dear Listers,
There are just a few more days left of this year's List Fund Raiser! Response
has been very good, but still well behind last year. If you've been waiting until
the last minute to make your contribution and maybe even pick up a great
gift, now might be good time to show your support!
Please remember that there isn't any sort of commercial advertising on the Lists
and the *only* means of keeping these Lists running is through your Contributions
during this Fund Raiser.
Please make a Contribution today!
http://www.matronics.com/contribution
Thank you!
Matt Dralle
Matronics Email List Administrator
Message 1
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Subject: | Re: Crowbar Circuit |
At 12:35 PM 11/19/2009, you wrote:
>
>If anyone is interested I've posted a circuit and veroboard layout
>for a tested and working crowbar circuit based on the MC3423 chip on
>the blog for my Wittman Tailwind build. Total parts cost around $5.
>
>http://tailwindbuild.blogspot.com/2009/11/15th-november-2009-overvoltage-crowbar.html
>
>Click on the pics/diagrams to enlarge
>
>The variable resistor allows the crowbar voltage to be set as
>required and compensates for differences in the internal reference
>voltage on the MC3423.
Some thoughts based on lessons-learned:
You need to select the trip time delay capacitor
for something on the order of 50-100 milliseconds.
Further, depending on how "twitchy" the SCR is,
you may experience nuisance triggers of the SCR
due to very low energy but fast rise-time
noises on the bus. These are effectively dealt
with by tying a 10 ohm resistor from SCR gate
to ground (which may mean a commensurate increase
in gate drive requirements from the MC3423).
Bob . . .
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Message 2
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Hello!
I've done a fair amount of crimping and a little soldering while wiring my instrument
panel mockup, and have a few questions. Maybe posting one or two pics
per post will work. This is for my Jabiru 3300 Sonex with a standard ~30 degree
tilted panel. I've put a piano hinge along the bottom and top with a few nutplates
to go on the side. The tank and glareshield are removed. Tank has roughly
the same cross section as the panel face, starts about a foot in front of the
panel to the firewall.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274009#274009
Attachments:
http://forums.matronics.com//files/panel_front_112.jpg
Message 3
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Subject: | Re: Dan's Switches |
This pic is from the left side looking right, with the panel tilted forward. Some
have had interference problems with the top of the Enigma hitting the glare
shield, but mine just fits.
At the top of the pic you can see the cover for the main buss. It's mocked up to
fit on the underside of the glare shield. Taking out the top hinge pin will
let it swing down for easier access. On the bottom side of the cover I've mounted
a section of ground tabs.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274011#274011
Attachments:
http://forums.matronics.com//files/panel_pivoted_119.jpg
Message 4
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Subject: | Re: Dan's Switches |
This is with the panel in the closed position. The channel that the lower piano
hinge attaches to is 025 with either 1/2" or 3/4" flanges. Some of the longer
wires, like the blue one in the foreground, can be tucked away from the flange.
There are a few shorter wires that need to have a zip tie pull them up and
away, or maybe ben up the switch terminals. The 3rd switch back is a good example.
It has a white and red wire resting on the flange.
In the foreground is my security switch for the starter button, mentioned in earlier
posts.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274017#274017
Attachments:
http://forums.matronics.com//files/switch_gang_200.jpg
Message 5
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Subject: | Re: Dan's Switches |
Since a DPDT switch is the same size and almost the same price as a SPST, I thought
I could increase switch reliability by putting in 2-3 instead of 1-3 switches.
The pic shows one for a magneto lead. I separated the shield and put blue
heatshrink on the braid and covered the junction with a piece of clear heatshrink.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274018#274018
Attachments:
http://forums.matronics.com//files/shielded_mag_wire_to_2_3_switch_191.jpg
Message 6
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Subject: | Re: Dan's Switches |
Last week I crimped connections betwen my regulator and alternator relay. The Jabiru
regulator comes with a harness or whatever you call the plastic thing with
6 male faston blades inside. Besides being a bit cramped in there, one of the
blades is a bit loose. I think it just got pushed or pulled out of its socket,
since I can't budge the female-male faston connection. For this reason I'm
thinking of cutting off the plastic harness (and tabs, if needed) to free up
the individual wires.
I also realize the fastons to the relay aren't in all the way. And it needs a diode.
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274020#274020
Attachments:
http://forums.matronics.com//files/regulator_fastons_118.jpg
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