Today's Message Index:
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1. 04:56 AM - Re: Re: Tachometer Generator Wiring (ROGER & JEAN CURTIS)
2. 07:10 AM - Re: 300mA AA NiMh charger design needed (Robert L. Nuckolls, III)
3. 07:10 AM - Re: Re: Tachometer Generator Wiring (Robert L. Nuckolls, III)
4. 09:38 AM - Re: Tachometer Generator Wiring (user9253)
5. 11:59 AM - Re: Short in E-Bus Feed Circuit? (user9253)
6. 01:03 PM - Re: Short in E-Bus Feed Circuit? (jvolkober)
Message 1
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| Subject: | Re: Tachometer Generator Wiring |
I have a little "do everything" board and enclosure
that might be suited to your task. See:
http://aeroelectric.com/Pictures/Schematics/Do-Much_Board.pdf
http://www.aeroelectric.com/Catalog/AEC/9011/A15_Package.jpg
Depending on what parts are installed on the board, what
parts are left off, and what code goes into the
8-pin PIC, you can do a whole lot of neat things.
Bob . . .
I noticed that this was just posted yesterday on your
website. Is there any documentation available? What things do you
anticipate it to be used for?
Roger
Message 2
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| Subject: | Re: 300mA AA NiMh charger design needed |
At 10:38 PM 9/29/2011, you wrote:
><retasker@optonline.net>
>
>Bob, your calculations are off by a factor of ten relative to the
>resistor needed to get 300 mA.
>
>The 317 series has a reference voltage of 1.25V as you noted. But
>to get 300 mA you would need 1.25V/0.3A = 4.17ohms. A value of 3.9
>ohms is the closest 5% resistor value and it would give you 320 mA -
>likely close enough. You would need at least a 1/2 W resistor for
>this application and a 1W would keep the temperature rise in the
>resistor more reasonable.
>
>Other than that everything else you say is fine.
>
>It should be noted that using a charger like this is fine as long as
>one removes it shortly after the batteries are fully
>charged. Otherwise, the overcharging will shorten their useful lives.
Yes! Thank you my friend!
Bob . . .
Message 3
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| Subject: | Re: Tachometer Generator Wiring |
>
> I noticed that this was just posted yesterday on your
>website. Is there any documentation available? What things do you
>anticipate it to be used for?
It's the core board for about a dozen different
products with the notion of having 90% common bill
of materials and differing only by what software
is installed. AEC9011 is but one example.
> Roger
>
>
Bob . . .
Message 4
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| Subject: | Re: Tachometer Generator Wiring |
Thanks for the response Bob N.
This is an RV-12. The RPM sensor is part of the Rotax 912 engine. The tach trigger coil sends a small AC voltage signal to the tach once every revolution of the crankshaft, according to page 8 of this document: http://flymall.org/aircraft/docs/FAQs-on-Rotax.pdf
I do not have a portable scope. But my Fluke meter shows an AC voltage.
Does your "do everything" board come with ASM code for the various functions or
do we have to write our own?
Thanks, Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353638#353638
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| Subject: | Re: Short in E-Bus Feed Circuit? |
It sounds to me that the polarity of the diode is reversed. Have you double checked
that?
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353644#353644
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| Subject: | Re: Short in E-Bus Feed Circuit? |
It turns out that the rectifier diode was defective. I probable shorted it out
or something as I was installing and testing wiring over the past several months.
At one point it worked and I thought that I checked it yesterday. I ran
down to my local electronics parts store and pick up a replacement and everything
checks out now.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353653#353653
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