Hope to solve soon but do any of my fellow builders have experience in the total resistor value needed to solve erratic rpm readings on Dynon HDX unit and Continental O -200? Tried 30k, 62k, 92k, off p lead and the display still goes bonkers at rpm exceeding 2300. Thanks in advance.

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Comment by David Mason on October 6, 2019 at 6:51pm

Thank you all who commented. I’m going to go with the unit Chris listed as this is definitely a better solution than these resistors off the p lead. Glad to learn something new today. Cheers 

Comment by christopher fryatt on October 6, 2019 at 4:31pm
Comment by Mickey R. Mathieson on October 6, 2019 at 3:41pm

Transducer is another way to filter out the noise as mentioned.

“A device for transforming mechanical into electrical energy, which consists of a magnetic fieldincluding a variable-reluctance path and a coil surrounding all or a part of this path, so that variationin reluctance leads to a variation in the magnetic flux through the coil and a corresponding inducedemf (electromotive force)”.

Comment by David Mason on October 6, 2019 at 1:37pm

Home building is a constant learning process so what the heck is a magnet transducer? Please provide a link if able. 

Comment by christopher fryatt on October 6, 2019 at 1:21pm

Again..... remove drip port from either mag, install magnetic transducer and wire into dynon, no noise no problem. Messing with p leads is the problem. one sensor needed as it senses rotation of either mag. Using this setup trouble free, accurate stable reading for 4 years

Comment by David Mason on October 6, 2019 at 1:15pm

Thanks for the input, I tried 120k ohms this morning and still erratic over 2200.serms like this should not be this difficult and Dynon should have an easier fix for something as needed as an accurate Rpm reading. 

Comment by James Machin on October 6, 2019 at 12:19pm
the right side and then the reading stays solid for the flight.
Comment by James Machin on October 6, 2019 at 12:16pm

Keep going bigger until the noise goes away. You know you have gone too far if the low RPM start missing counts and reads low. I think I read Dynon recommending up to 150k in some cases. On my O-200 the left mag is a bit noisy so during the mag check I check the right mag last to force the Dynon to read the right side and then it stays solid.  

Comment by Mickey R. Mathieson on October 6, 2019 at 12:10pm

I agree with Damon. Most likely noise which a capacitor would help filter out. A resistor “resists flow” and will not smooth out the ripples.

Comment by christopher fryatt on October 6, 2019 at 10:17am

I am using older dynon d-100 and have had easy set-up and accurate signal using the UMA magnetic pickup off 1 mag. about $118 

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