Today's Message Index:
----------------------
1. 07:08 AM - Re: Trim Relay Deck (D Fritz)
2. 07:46 AM - Re: Trim Relay Deck (Robert L. Nuckolls, III)
3. 09:19 AM - Request to Bob Nuckolls (Matt Jurotich)
4. 11:15 AM - 1N4004 vs 1N4001 (Mickey Coggins)
5. 11:27 AM - Re: 1N4004 vs 1N4001 (Charlie England)
6. 11:54 AM - Re: 1N4004 vs 1N4001 (Mickey Coggins)
7. 12:03 PM - Re: Request to Bob Nuckolls (glaesers)
8. 02:31 PM - Re: Trim Relay Deck (SportAV8R@aol.com)
9. 07:08 PM - Re: 1N4004 vs 1N4001 (B Tomm)
10. 09:34 PM - Re: 1N4004 vs 1N4001 (Richard E. Tasker)
11. 10:43 PM - Re: 1N4004 vs 1N4001 (Mickey Coggins)
Message 1
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| Subject: | Re: Trim Relay Deck |
--> AeroElectric-List message posted by: D Fritz <dfritzj@yahoo.com>
Thanks for the replies. The T5 drawing seems to fit the bill for a simple, low
parts-count system. As I interpret the drawing, if the two sticks command opposite
trim, the motor simply stops, with no ill effects on the system. Is this
correct? Also, I have looked at the Matronics relay deck, but according to
Matt, it can only handle 1 Amp. As I understand it the pitch trim motor for
the Velocity can draw up to 3A (does anyone know otherwise?)
Dan Fritz
Velocity
---------------------------------
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| Subject: | Re: Trim Relay Deck |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 07:07 AM 12/18/2004 -0800, you wrote:
>--> AeroElectric-List message posted by: D Fritz <dfritzj@yahoo.com>
>
>Thanks for the replies. The T5 drawing seems to fit the bill for a
>simple, low parts-count system. As I interpret the drawing, if the two
>sticks command opposite trim, the motor simply stops, with no ill effects
>on the system. Is this correct?
yes
> Also, I have looked at the Matronics relay deck, but according to Matt,
> it can only handle 1 Amp. As I understand it the pitch trim motor for
> the Velocity can draw up to 3A (does anyone know otherwise?)
Be cautious of relay ratings and application . . . especially when
working with motors and/or motors with noise filter capacitors
across them. I've been studying relay and switch failures at
RAC involving contacts that experience average loads that
are a tiny fraction of the relay's current ratings and they
still stick or go open. Contact science has some ramifications
at both ends of the bell curve for performance that offer
some big surprises.
The question for the Velocity trim motor is what is the
inrush current? I suspect that running current in normal
operation is quite nominal but inrush currents can be in
the 10-20A range.
For this kind of system, I'd lean toward an all solid state
controller as opposed to relays. The topic of trim systems
comes up and boils real well for about a week every year.
I was prompted by the latest event to craft an article to
accompany a fist full of drawings to discuss various considerations
for pitch trim (or roll trim or rudder trim) systems.
I've got the text nearly completed and most of the drawings
are done too. I'll be publishing this document over the
holiday shutdown.
Bob . . .
--
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Message 3
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| Subject: | Request to Bob Nuckolls |
--> AeroElectric-List message posted by: Matt Jurotich <mjurotich@hst.nasa.gov>
Bob
I finally found a 120 volt AC clock. I would like to build the battery
life tester but get intimidated when I go to Digikey or Mouser web
sites. Would you please give a list of what to buy from say Digikey to
make the beast? Would you use a circuit board or just wire wrap on a piece
of plywood? I assume that plugs and sockets from the hardware store are OK
for the 120 V AC stuff.
Thanks in Advance
Matthew M. Jurotich
NASA/Goddard Space Flight Center
JWST ISIM Systems Engineer
m/c : 443
e-mail mailto: mjurotich@hst.nasa.gov
phone : 301-286-5919
fax : 301-286-7021
JWST URL: <http://ngst1.gsfc.nasa.gov>
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| Subject: | 1N4004 vs 1N4001 |
--> AeroElectric-List message posted by: Mickey Coggins <mick-matronics@rv8.ch>
Hi,
I'm trying to figure out if in our 14v systems there would ever be a
reason to use an 1N4004 diode vs. a 1N4001 diode. According to the data
sheets I've read, the only difference seems to be Vmax is 50V for the
1N4001 and 400V for the 1N4004. Are there any other differences or
advantages/disadvantages of one over the other? The application is to
keep current from flowing the wrong way on a panel LED indicator.
Thanks,
Mickey
--
Mickey Coggins
http://www.rv8.ch/
#82007 wiring and stuff
Message 5
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| Subject: | Re: 1N4004 vs 1N4001 |
--> AeroElectric-List message posted by: Charlie England <ceengland@bellsouth.net>
Mickey Coggins wrote:
>--> AeroElectric-List message posted by: Mickey Coggins <mick-matronics@rv8.ch>
>
>Hi,
>
>I'm trying to figure out if in our 14v systems there would ever be a
>reason to use an 1N4004 diode vs. a 1N4001 diode. According to the data
>sheets I've read, the only difference seems to be Vmax is 50V for the
>1N4001 and 400V for the 1N4004. Are there any other differences or
>advantages/disadvantages of one over the other? The application is to
>keep current from flowing the wrong way on a panel LED indicator.
>
>Thanks,
>Mickey
>--
>Mickey Coggins
>http://www.rv8.ch/
>#82007 wiring and stuff
>
Is there a difference in price? In my previous life as an electronics
tech, the difference in price was at most pennies per hundred pcs and
there was no discernable size or weight difference. Given those
conditions, I'd pick the 4004 because it's likely to be more
electrically 'rugged' in back-emf conditions than the 4001. I bought the
1k Vmax versions & used them everywhere that the current rating was
adequate to keep inventory & callbacks down. (Then I found some Japanese
p/n with twice the current rating at 1kV for the same price & used those.)
Charlie
Message 6
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| Subject: | Re: 1N4004 vs 1N4001 |
--> AeroElectric-List message posted by: Mickey Coggins <mick-matronics@rv8.ch>
> Is there a difference in price? In my previous life as an electronics
> tech, the difference in price was at most pennies per hundred pcs and
> there was no discernable size or weight difference. Given those
> conditions, I'd pick the 4004 because it's likely to be more
> electrically 'rugged' in back-emf conditions than the 4001. I bought the
> 1k Vmax versions & used them everywhere that the current rating was
> adequate to keep inventory & callbacks down. (Then I found some Japanese
> p/n with twice the current rating at 1kV for the same price & used those.)
Hi Charlie,
No difference in price where I buy them, and they are only about
15 cents. I've already got both. Thanks for the info.
Best regards,
Mickey
Message 7
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| Subject: | Re: Request to Bob Nuckolls |
--> AeroElectric-List message posted by: "glaesers" <glaesers@wideopenwest.com>
I'm not Bob - but I've been thinking about making a tester also, and came up
with the following parts:
- Relay - Radio Shack 275-218 ($8.39 -- radioshack.com - the cheapest I
found on Digikey was about $12)
- Zener Diode - Digikey 1N5374B ($1.20 -- 5W 10V zener diode - don't
really need 5W but it's cheap)
- Transistor - Digikey 2N3904FS-ND ($0.16)
- 470 Ohm Resistors - Digikey 470-5-ND ($0.41 each, 2 required -- also
5W - overkill, but available in small quantities from Digikey)
---- I calculated the resistors would dissapate .343 watts @12.7 V
---- so a couple of 0.5 watt Radio shack resistors would probably also work
($1 for a pack of 5)
I'm just going to crimp fastons and screw terminals on things and mount it
on a piece of wood.
Now we'll see if Bob approves... (a test to see what I have, or haven't,
learned :-)
Dennis Glaeser
------------------------
I finally found a 120 volt AC clock. I would like to build the battery
life tester but get intimidated when I go to Digikey or Mouser web
sites. Would you please give a list of what to buy from say Digikey to
make the beast? Would you use a circuit board or just wire wrap on a piece
of plywood? I assume that plugs and sockets from the hardware store are OK
for the 120 V AC stuff.
Thanks in Advance
Matthew M. Jurotich
NASA/Goddard Space Flight Center
JWST ISIM Systems Engineer
Message 8
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| Subject: | Re: Trim Relay Deck |
--> AeroElectric-List message posted by: SportAV8R@aol.com
Thank you, Bob, for everything you do to help the OBAM community along. I'm indebted
to you, because as I refine and re-do my RV's electrics, I am increasingly
the beneficiary of your mental sweat.
-Bill B
do not archive
>>>For this kind of system, I'd lean toward an all solid state
controller as opposed to relays. The topic of trim systems
comes up and boils real well for about a week every year.
I was prompted by the latest event to craft an article to
accompany a fist full of drawings to discuss various considerations
for pitch trim (or roll trim or rudder trim) systems.
I've got the text nearly completed and most of the drawings
are done too. I'll be publishing this document over the
holiday shutdown.
Bob . . .<<<
Message 9
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| Subject: | 1N4004 vs 1N4001 |
--> AeroElectric-List message posted by: B Tomm <fvalarm@rapidnet.net>
I'm going strictly from memory here as I don't have access to my books, but
I suspect the main difference is the current carrying capacity. IN4004 is
likely a 4 amp. IN4001, 1 amp etc.
Bevan
RV7A fuse is now right side up.
Seat pans are in and making airplane noises now.
-----Original Message-----
From: Mickey Coggins [SMTP:mick-matronics@rv8.ch]
Subject: AeroElectric-List: 1N4004 vs 1N4001
--> AeroElectric-List message posted by: Mickey Coggins
<mick-matronics@rv8.ch>
Hi,
I'm trying to figure out if in our 14v systems there would ever be a
reason to use an 1N4004 diode vs. a 1N4001 diode. According to the data
sheets I've read, the only difference seems to be Vmax is 50V for the
1N4001 and 400V for the 1N4004. Are there any other differences or
advantages/disadvantages of one over the other? The application is to
keep current from flowing the wrong way on a panel LED indicator.
Thanks,
Mickey
--
Mickey Coggins
http://www.rv8.ch/
#82007 wiring and stuff
Message 10
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| Subject: | Re: 1N4004 vs 1N4001 |
--> AeroElectric-List message posted by: "Richard E. Tasker" <retasker@optonline.net>
Your suspicion is definitely not correct.
These two diodes are part of a family of 1A rectifier diodes. They all
have a 1A average forward current rating. The 1N4001 has a 50V reverse
breakdown rating. The 4002 has 100V. The 4003 has 200V. The 4004 has
400 V. The 4005 has 600V. The 4006 has 800V. The 4007 has 1000V.
Any of these will work in your plane. However, if you have a choice,
use of the higher breakdown rating diodes gives you more margin with no
downside. (although going to a 1000V rated diode is rather unnecessary).
Dick Tasker
B Tomm wrote:
>--> AeroElectric-List message posted by: B Tomm <fvalarm@rapidnet.net>
>
>I'm going strictly from memory here as I don't have access to my books, but
>I suspect the main difference is the current carrying capacity. IN4004 is
>likely a 4 amp. IN4001, 1 amp etc.
>
>Bevan
>RV7A fuse is now right side up.
>Seat pans are in and making airplane noises now.
>
>
>
>
Message 11
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| Subject: | Re: 1N4004 vs 1N4001 |
--> AeroElectric-List message posted by: Mickey Coggins <mick-matronics@rv8.ch>
> ...
>
> Any of these will work in your plane. However, if you have a choice,
> use of the higher breakdown rating diodes gives you more margin with no
> downside. (although going to a 1000V rated diode is rather unnecessary).
Many thanks for the info. Since I've got both, I'll just use the 1N4004.
Best regards,
Mickey
--
Mickey Coggins
http://www.rv8.ch/
#82007 Wiring
do not archive
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