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08-07-2009, 07:42 PM
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Join Date: Jun 2005
Location: Raleigh, North Carolina
Posts: 1,128
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Experimental Carbon Monoxide detectors
Hear me out here. I got my hands on a tiny "First Alert" CO detector. I removed the circuit from plastic case which includes a LED indicator and a piezo annunciator. The unit could easily be panel mounted with a test and alarm acknowledge button. After silencing the alarm the LED keeps blinking till the CO is removed.
Runs on a pair of 1 1/2 volt AA batteries. Any of you electrical guys know of a source for a very small 12 to 3 volt step down transformer to hard wire it? Would a few resistors in series be acceptable to lower the voltage? This thing is very sensitive.
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Tom Norwood
Classic "Short Tail 6A N822PM
TMX-O360. Phase 1
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08-07-2009, 07:56 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,827
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The batteries are good for a year. Just change them during your inspection.............
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08-07-2009, 08:16 PM
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Join Date: Oct 2005
Location: Savannah, GA
Posts: 1,849
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Quote:
Originally Posted by gasman
The batteries are good for a year. Just change them during your inspection.............
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And much safer than hard wiring it. Battery powered allows it to be on its own independent electrical system.
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Todd
N110TD
RV-10 Vesta V8 LS2/BMA EFIS/One formerly flying at 3J1 Hobbs stopped at 150 hours
Savannah, GA and Ridgeland, SC
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08-07-2009, 08:33 PM
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Join Date: Oct 2005
Location: OWASSO,OK
Posts: 192
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Transformers only work on A.C. not D.C.
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Jim Gallaway VAF#782 2013 PAID 2014 paid
Gundys airport
Owasso,Ok
RV8A N184JG FLYING SOLD
RV7 N1717G FLYING sold
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08-07-2009, 08:34 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,430
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Yep, go with the batteries.
Step down transformer wont work on D.C. anyway, will need something a bit fancier.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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08-07-2009, 08:57 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,150
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As pointed out, a transformer is useless in the Direct Current world. A Zener diode, on the other hand...
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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08-07-2009, 11:56 PM
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Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
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OR
Just fly LOP all the time..then there is no CO and a detector is not needed.. |
08-08-2009, 06:25 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by frankh
Just fly LOP all the time..then there is no CO and a detector is not needed.. |
Frank, what are you basing this on? Anytime you burn fuel you are going to get CO. What am I missing?
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RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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08-08-2009, 09:02 AM
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Join Date: Mar 2005
Posts: 179
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When rich of peak there is an oxygen deficiency, when lean of peak there is an oxygen excess. So (I'm guessing this is what Frank means) when lean of peak it's more likely that all of the fuel is being completely oxidized into CO2, which can't happen when rich of peak.
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Jim Percy
SoCal
FFI Wingman
RV-7A, XP-O-360
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