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sonar1@cox.net
Joined: 02 Oct 2007
Posts: 55
Location: Santa Barbara, Ca
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 Posted: Thu Jan 17, 2008 4:18 pm Post subject: Electronic oil pressure switch |
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I wanted to use a Hobbs hour meter, but did not want to tap into the oil pressure line to do it, so I went electronic.
For about $2, I have a circuit that turns on the Hobbs when the oil pressure exceeds 10 psi (.8 volts on the sense line).
If anyone else would like to do this, I have attached the circuit diagram and a picture. The led and resistor are optional, but tell you when it is on. A big piece of heat shrink over the whole thing finishes it.
The chip is your basic comparator, LM311N (Jameco has them for 94 cents). The two resistors determine the voltage (oil pressure) where it will switch. This simple circuit may also be used for alarms or warning lights for other functions.
Fred Sanford...601XL...Jabiru...80%...California
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John75142
Joined: 05 Dec 2007
Posts: 56
Location: Kaufman, TX
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| Posted: Thu Jan 17, 2008 5:16 pm Post subject: Electronic oil pressure switch |
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Great idea, do you have the part numbers for the remaining pieces?
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John Short |
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Martin Pohl
Joined: 30 Jan 2006
Posts: 118
Location: CH-8645 Jona SG, Switzerland
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| Posted: Fri Jan 18, 2008 5:49 am Post subject: Re: Electronic oil pressure switch |
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Super!!! Thank you for your circuit diagram, I will use something like this in my own installation.
Cheers
Martin
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Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland
http://www.pohltec.ch/ZodiacXL/Main.html |
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