Today's Message Index:
----------------------
1. 07:04 AM - Re: Favorite "switch feel"? (flmike)
2. 07:26 AM - Re: Re: Favorite "switch feel"? (Dale Martin)
3. 07:48 AM - Re: Re: Favorite "switch feel"? - Otto (Carlos Sa)
4. 08:49 AM - Re: Load dump issues (George Braly)
5. 06:36 PM - Essential bus alternate feed from two batteries (Jim Stone)
6. 07:47 PM - Re: Essential bus alternate feed from two batteries (Wayne Berg)
Message 1
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| Subject: | Re: Favorite "switch feel"? |
--> AeroElectric-List message posted by: flmike <flmike2001@yahoo.com>
Otto, Otto, Otto.
IMO, Otto Engineering has the best pushbutton switches
out there. They have a rolling sleeve action that
gives a silky smooth push to a tactile, crisp snap
followed by a "drop-through". There is no doubt when
you have actuated the switch. Grab any "real"
military stick or throttle grip and you're probably
pushing Otto switches. They also make some smaller
styles that are just as nice. Top shelf stuff.
Next in line would probably be ITW for push buttons.
For toggles, I prefer the MS3505x style for panel
applications. I think they feel robust and positive.
As someone else said, it's like the difference between
a fine gun trigger and a crappy one. Once you've
experienced a fine one you're spoiled for life.
Mike
__________________________________
http://antispam.yahoo.com/tools
Message 2
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| Subject: | Re: RE: Favorite "switch feel"? |
--> AeroElectric-List message posted by: "Dale Martin" <niceez@cableone.net>
I thought switch feel was cured by using push button switches?
For me the nice sharp manly click of a military bat switch is the best.
Arrrgh...Arrrgh... Arrgh... Arrrgh!!!
I always think the soft ones are going to break.
I have used 7 Potter-Brumfield circuit-breaker - switches called
"combination switches" and they perform flawlessly. They seem to cost a
little less then the standard switch by itself. I like saving weight and
even though Bob promotes fuses it seems inefficient to use a fuse and a
switch when the combination switch will do the work perfectly and only
requires one (1) wire out to the item requiring power and that also reduces
wiring and I don't notice weight increase verses the standard switch.
Each to there own I guess but after 1,100 of VFR/IFR flying in the LEZ the
combination switches have never given me a problem and the wiring simplicity
is something to be enjoyed.
They also have the sharp click and as most bat switches you can tell by
looking if they're on or off.
-Dale
----- Original Message -----
From: "Dave Morris" <dave@davemorris.com>
Subject: Re: AeroElectric-List: RE: Favorite "switch feel"?
> --> AeroElectric-List message posted by: Dave Morris <dave@davemorris.com>
>
> I can relate to the need for good switch feel. I hate clunky switches
that
> are too hard to flip. But gadzooks Eric, I absolutely hated the IBM
> keyboards, so I don't know what the HECK you're talking about! LOL!
>
> Anyway, I was in Altex, an electronics store in Dallas today and flipped
> all the switches they had on a display board there. Didn't really like
any
> of them. The metal ones are usually too "hard", and the ones with plastic
> bat handles are usually too "soft" and easy to accidentally flip.
>
> I did luck out with the switch panels I had built by Aircraft Simulators
> (www.AircraftSimulators.com), because they feel "just right". They are
> made by "Chili" and rated at 10A.
>
> Dave Morris
>
> At 04:03 PM 2/19/2004, you wrote:
>
> >--> AeroElectric-List message posted by: "Eric M. Jones"
<emjones@charter.net>
> >
> > >>Does anyone have a favorite brand of switch that they prefer to use,
based
> > >>on its tactile feel and smoothness of switch action?
> >
> >Now there's a man after my own heart.
> >
> >If there were switches that felt like the shutter button of a Leica M3,
I'd
> >buy them. Hewlett Packard thought switch "feel" in calculators was
> >incredibly important; they provide important tactile feedback. Same with
> >IBM. No matter what computer I use I take my own IBM/AT keyboard to use.
> >
> >I once complained to a switch manufacturer that a potentiometer felt
"cheap"
> >and was told by the manufacturer that they can make it feel any way at
all
> >by changing the silicone grease. So I ordered per their suggestion XYZ
> >grease and everyone was happy.
> >
> >High-priced audio equipment makers specialize in this art. But I suspect
> >that most corporate bean-counters are not interested in this, and many
> >manufacturers just stumble across it accidentally.
> >
> >Everything feels good in a glob of grease.
> >
> >Regards,
> >Eric M. Jones
> >www.PerihelionDesign.com
> >113 Brentwood Drive
> >Southbridge MA 01550-2705
> >Phone (508) 764-2072
> >Email: emjones@charter.net
> >
> >
>
>
Message 3
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| Subject: | Re: Favorite "switch feel"? - Otto |
--> AeroElectric-List message posted by: Carlos Sa <carlosfsa@yahoo.com>
Lots of good info on their site: http://www.ottoeng.com/
(Photos, specs, distributors, etc.)
--- flmike <flmike2001@yahoo.com> wrote:
> --> AeroElectric-List message posted by: flmike <flmike2001@yahoo.com>
>
> Otto, Otto, Otto.
> IMO, Otto Engineering has the best pushbutton switches
> out there. They have a rolling sleeve action that
> gives a silky smooth push to a tactile, crisp snap
> followed by a "drop-through". There is no doubt when
> you have actuated the switch. Grab any "real"
> military stick or throttle grip and you're probably
> pushing Otto switches. They also make some smaller
> styles that are just as nice. Top shelf stuff.
Message 4
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| Subject: | Load dump issues |
--> AeroElectric-List message posted by: George Braly <gwbraly@gami.com>
I was using the 5000W devices.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Jerzy
Krasinski
Subject: Re: AeroElectric-List: Load dump issues
--> AeroElectric-List message posted by: Jerzy Krasinski
<krasinski@direcway.com>
George Braly wrote:
>--> AeroElectric-List message posted by: George Braly <gwbraly@gami.com>
>
>
>Bob,
>
>I have done a fair amount of testing a couple of years ago, working with
the
>TVS devices, including the larger sized versions.
>
>In my experience, they have not been adequate, alone, to prevent over
>voltage spikes on load dumps, even from smaller alternators.
>
>They help. But I have blown some of them on load dumps.
>
>Regards, George
>
>
>
>
I am not surprised. Looking at the data for 1500W devices we find the
maximum pulse is 1ms at half peak value current. That is much shorter than
the expected alternator pulse.
The non repeatable surge current is listed as 200A for 50 ms. Probably more
likely peak current would be around 50A, so that would allow some extension
of the pulse length. But that is for a nonrepeatable event.
That shows that for the alternator full current application they are beaten
at the the surge limits.
Connecting TVS devices in parallel is a waste. Their characteristics differ
enough so most of the current will go through one TVS, while others will
just hang there. Maybe measuring them and selecting them in very similar
bunches would work, but that requires building a nonstandard curve tracer
for operation at rather high currents. Probably it can be done in a crude
way discharging a capacitor through a few of them in parallel and observing
the currents on a multichannel scope.
One can easy increase the power to 3000W by connecting in series two 6.8V
devices. Unfortunately, 6.8V is the lowest voltage TVS I found, and that
increases power only by a factor of two. But if in your experiments they
failed only sometimes, that factor of two might be everything we need.
Jerzy
>
>
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Message 5
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| Subject: | Essential bus alternate feed from two batteries |
--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
I have a two battery one alternator RV and would like to be able to use
the power in both batteries in the event of alternator failure. I am
using Bob's Z-11 (Generic Light A/C) drawing with the Aux battery added.
Do I need two separate essential bus alternate feed switches in order to
keep the batteries isolated?
Thanks
Jim
Message 6
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| Subject: | Re: Essential bus alternate feed from two batteries |
--> AeroElectric-List message posted by: "Wayne Berg" <wfberg@msn.com>
No. Read chapter 17 in The Aero Electric Connection.
----- Original Message -----
From: Jim Stone
Subject: AeroElectric-List: Essential bus alternate feed from two batteries
--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
I have a two battery one alternator RV and would like to be able to use
the power in both batteries in the event of alternator failure. I am
using Bob's Z-11 (Generic Light A/C) drawing with the Aux battery added.
Do I need two separate essential bus alternate feed switches in order to
keep the batteries isolated?
Thanks
Jim
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