Today's Message Index:
----------------------
1. 11:48 AM - Interesting Products ()
2. 01:44 PM - IVO Prop Motor Current Limiter and Electronic CB (Robert L. Nuckolls, III)
3. 05:09 PM - Re: IVO Prop Motor Current Limiter and Electronic CB (Mike Welch)
4. 05:37 PM - Re: IVO Prop Motor Current Limiter and Electronic CB (Robert L. Nuckolls, III)
5. 05:48 PM - Re: IVO Prop Motor Current Limiter and Electronic CB (Robert L. Nuckolls, III)
6. 08:25 PM - Re: IVO Prop Motor Current Limiter and Electronic CB (Dennis & Anne Glaeser)
Message 1
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| Subject: | Interesting Products |
5/8/2010
Some products that may be of interest to list members:
http://www.qcavionix.com/index.php?cat=10000
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
Message 2
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| Subject: | IVO Prop Motor Current Limiter and Electronic CB |
Somebody was willing to build the circuit I proposed and
was asking about sources for the power mos-fet called out
on the drawing. I left that note on my computer in Wichita
so I'm sort of broadcasting this response in the blind . . .
I used Digikey as the first-source for any drawings I
publish. They stock an extensive collection of International
Rectifier parts. You'll be able to find the IR mos-fet
here . . .
http://www.digikey.com
Bob . . .
Message 3
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| Subject: | IVO Prop Motor Current Limiter and Electronic |
CB
Hi Bob=2C
That was me that asked about the mos-fet. I had made out my shopping lis
t of parts on Mouser=2C and when it was almost finished=2C I got to the IRF
P 3703. No matter how hard I tried=2C I just couldn't come up with one tha
t they carry.
Since it took me quite awhile to fill out the Mouser shopping cart=2C I w
as wondering if you knew of a compatible version of the 3703 that Mouser se
lls.
Mike Welch
PS. I did find it on Digikey=2C but I was hoping to get everything from on
e vendor. Thnx
> Somebody was willing to build the circuit I proposed and
> was asking about sources for the power mos-fet called out
> on the drawing.
> I used Digikey as the first-source for any drawings I
> publish. They stock an extensive collection of International
> Rectifier parts. You'll be able to find the IR mos-fet
> here . . .
>
> http://www.digikey.com
>
>
>
> Bob . . .
>
>
===========
===========
===========
===========
>
>
>
_________________________________________________________________
Hotmail has tools for the New Busy. Search=2C chat and e-mail from your inb
ox.
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N:WL:en-US:WM_HMP:042010_1
Message 4
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| Subject: | IVO Prop Motor Current Limiter and Electronic |
CB
At 07:07 PM 5/8/2010, you wrote:
>Hi Bob,
>
> That was me that asked about the mos-fet. I had made out my
> shopping list of parts on Mouser, and when it was almost finished,
> I got to the IRFP 3703. No matter how hard I tried, I just
> couldn't come up with one that they carry.
> Since it took me quite awhile to fill out the Mouser shopping
> cart, I was wondering if you knew of a compatible version of the
> 3703 that Mouser sells.
>
>Mike Welch
>PS. I did find it on Digikey, but I was hoping to get everything
>from one vendor. Thn
The 3703 was selected for its very low on-resistance
where IR is sort of the defacto champion in that
arena.
I'm not familiar with the Mouser product offerings.
Bob . . .
Message 5
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| Subject: | IVO Prop Motor Current Limiter and Electronic |
CB
At 07:07 PM 5/8/2010, you wrote:
>Hi Bob,
>
> That was me that asked about the mos-fet. I had made out my
> shopping list of parts on Mouser, and when it was almost finished,
> I got to the IRFP 3703. No matter how hard I tried, I just
> couldn't come up with one that they carry.
> Since it took me quite awhile to fill out the Mouser shopping
> cart, I was wondering if you knew of a compatible version of the
> 3703 that Mouser sells.
Try the FDU6688_Q
Bob . . .
Message 6
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| Subject: | RE: IVO Prop Motor Current Limiter and Electronic CB |
I made the original circuit that Bob posted. I got all the parts from
DigiKey, including the IRFP 3703.
I was finally able to test that circuit today. It worked exactly as
predicted. With only the 0.1 ohm resistor, the current was limited to about
6 amps. This did not allow the motor to go as far as desired. So I added the
parallel 0.5 ohm resistors one at a time. With both in place, it allows a
bit over 8 amps, which is where the motor just starts to strain. This is
also about the same place where the reed switch triggers.
The mosfet does get rather warm, but only if the switch is held longer than
normal.
I also plan to build the Electronic CB circuit. When it was published, Bob's
said to wait until others had a chance to review and comment before
building, so I haven't begun that process yet.
Dennis Glaeser
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