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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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Mudfly
Joined: 04 Feb 2012
Posts: 37
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Mudfly
Joined: 04 Feb 2012
Posts: 37
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 Posted: Tue Mar 26, 2024 12:57 pm Post subject: Re: Which Oil Pressure Switch? |
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Thanks again gentlemen for the suggestions. As It turns out , after
consulting the folks at Garmin, it looks like I should be able to get 12v
to my Hobbs meter from the GEA24. Pin 9 on connector J243 is labeled
"RPM XDCR+12v -OUT".
Shawn
**"UPDATE" After further consultation with Garmin, the above information
is not correct. Pin 9 on the GEA 24 will output 12v as soon as the
unit is powered. Not once the the engine is running and RPM is
active as stated above.**
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nuckolls.bob(at)aeroelect
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| Posted: Fri Mar 29, 2024 8:16 pm Post subject: Which Oil Pressure Switch? |
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At 10:32 AM 3/26/2024, you wrote:
| Quote: | | I have a battery charger that senses vibration caused when the engine is started, and uses that as a trigger. I wouldn't have any idea how to procure or implement a vibration sensor as a trigger for your Hobbs, but I'll bet some of the guys on this list do. |
What's the alternator in your system?
PM dynamo perhaps?
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
for the-best-we-know-how-to-do based
on physics and repeatable experiment.
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sun Apr 07, 2024 7:27 am Post subject: Re: Which Oil Pressure Switch? |
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I happened across this circuit stored on my hard drive. Can not remember who
the author is. It is designed to detect an AC voltage. The output of an
alternator is not perfect DC, but has an AC component. This circuit will rectify
that AC voltage and output a DC voltage, perhaps enough to enough to enable
the Honeywell LCD LM SERIES MCU Hobbs meter. Since the meter only
requires 0.8 milliamp, its enable pin must require much less than that.
Perhaps someone can suggest resistor and capacitor values.
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Joking..but seriously, for a unit like that would it be