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02-27-2015, 08:10 AM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,367
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The "through hole" is what you want. You are not going to be mounting this to a circuit board, correct?
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02-27-2015, 08:12 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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Quote:
Originally Posted by prkaye
I need to order up a resistor to connect my Dynon tach input the Mag P-Lead.
SHould I go with a "Chasis mount" resistor, or a "Through hole" resistor?
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As far as operation is concerned, it doesn't matter which you choose. The chassis mount will obviously weigh more. I elected to use a through-hole resistor, soldered in-line to the proper EMS wire with heat shrink covering for strain relief.
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Kurt W.
RV9A
FLYING!!!
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02-27-2015, 08:36 AM
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Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
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Using chassis mount high wattage wirewound resistors for this would be gross overkill. Small 1/4 watt inline axial lead resistors are all that's necessary. You may also find that values as high as 100k ohms or larger may be needed to get stable rpm readings, especially on the older D120 EMS system with Slick mags.
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Neal Howard
Airplaneless once again...
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03-06-2015, 06:40 AM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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The manual says you can use resistor values all the way up to 150kohm. What would be the effect of using a larger resistor value than necessary? Possible damage to components? Zero RPM reading? Lagging RPM readings?
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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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03-06-2015, 06:49 AM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,034
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Quote:
Originally Posted by prkaye
The manual says you can use resistor values all the way up to 150kohm. What would be the effect of using a larger resistor value than necessary? Possible damage to components? Zero RPM reading? Lagging RPM readings?
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Too large a resistor value (Ohms) and you won't get any RPM indication.
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Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
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03-06-2015, 07:23 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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For what it's worth, a 1/2 watt 30k through-hole resistor works perfectly on both my Slick 4370/4371 mags with Skyview.
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Kurt W.
RV9A
FLYING!!!
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03-06-2015, 10:54 AM
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Join Date: Feb 2008
Location: Largo, FL
Posts: 1,027
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The larger you go
the slower the response on your readout --- I used 47s and they are fine -- Radio Shack did not have the 33s when I was looking.
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RV-10 Co-built, maintained, flown (sold)
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IO360, 180HP/CS, AFS 5600T, D10A, G650, G430, G327, ADS-B, VIZ385 AP
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Based at KCLW (Clearwater, FL)
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