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  • #1

    Surf PI Pro adjusment question

    I got to power up my SM Pro tonight. I adjusted R 10 to 0 volts on pin 6 of NE5534P then adjusted R2 to 3.3k as the instruction that came with my SM Pro said do. Everything seams to work fine as I had a 4" coil attached. I changed to a 8" coil and my reading at R2 went to 6.2K. Is this normal ? Do you have to adjust R2 to the coil you are using.
    Didn't have much time to work with it but the 4" coil would pick up a US penny at 6" . Will try to work with it again maybe tomorrow or Thursday.
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  • #2
    Hi Darin is NE5534P the closest to R10 ?

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    • #3
      Originally posted by eagle52 View Post
      Hi Darin is NE5534P the closest to R10 ?
      Eagle 52, R10 is the NE5534.

      Darin,
      As far as the R3 goes, I have always set it based on the coil I use because no 2 coils are the same
      in respect to inductance, windings, capacitance or other unknowns.

      Changing from a 4 inch to the larger 8 inch will make a difference in how it responds so yes,
      you will need to adjust it for the coil you will use with it if they are different in LC (inductance).

      If you have an 8 inch and a 4inch with similar specs then the setting may be fine for both coils
      but if they aren't close in specs then R3 will need to be adjusted to fit.

      At least that's my experience. Maybe one of the engineer guys can better answer.
      Last edited by geoscash1; 03-19-2015, 01:52 PM. Reason: forgot something..

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      • #4
        Originally posted by eagle52 View Post
        Hi Darin is NE5534P the closest to R10 ?
        On my pcb R10 is just above NE5534P. I connected my multi meter one lead to ground and the other to pin 6.Adjusted R10 trimmer to 0 volts. Then adjusted R2 to 3.3K to start as per the instructions that came with my SM PRO

        Comment

        • #5
          Originally posted by geoscash1 View Post
          Eagle 52, R10 is the NE5534.

          Darin,
          As far as the R3 goes, I have always set it based on the coil I use because no 2 coils are the same
          in respect to inductance, windings, capacitance or other unknowns.

          Changing from a 4 inch to the larger 8 inch will make a difference in how it responds so yes,
          you will need to adjust it for the coil you will use with it if they are different in LC (inductance).

          If you have an 8 inch and a 4inch with similar specs then the setting may be fine for both coils
          but if they aren't close in specs then R3 will need to be adjusted to fit.

          At least that's my experience. Maybe one of the engineer guys can better answer.
          Thanks geoscash1,
          I checked some other coils I made they did the same thing and thinking about it that makes sense no two will be just alike.
          Some of the coils I made where 26 awg. solid copper and some where 26 awg. stranded, ranging in size from 4" to 12".
          I have a 20" coil but have not checked it yet. Just curious what kind of depth it would get.
          I sold a ATX with a 20" coil the other day so just wanted to do some comparison between the two for fun.

          Thanks for your help.

          Comment

          • #6
            Originally posted by Darin View Post
            On my pcb R10 is just above NE5534P. I connected my multi meter one lead to ground and the other to pin 6.Adjusted R10 trimmer to 0 volts. Then adjusted R2 to 3.3K to start as per the instructions that came with my SM PRO
            Sorry bout that, I didn't catch that I had missed 2 words on my post, it was meant to say "Eagle52, Yes, R10 is next to the NE5534 ... Don't know why when
            commenting sometimes the editor leaves words out. I think its Internet Explorer that causes it, sometimes I have to let it catch up to
            the word I'm typing...sorry bout that eagle52.

            Your welcome Darin,... that 20 inch coil would be huge, not sure what kind of depth you would get with it connected to the surf but I bet
            you would dig up pop cans 30 inches deep....lol

            Comment

            • #7
              It is OK geoscash1 I knew it was typo
              I made several coils and I adjusted delay to my basket coil and I get 5" on 1.32 Gr 10K gold ring -7" on 1.75Gr and 9" on 3.5Gr I am not sure if it is good or not but I have no equipment to adjust properly so it is ok for now. Coil ID 6.5" OD 8.5"

              Comment

              • #8
                Eagle52, That seems like the average detection range so you are in the ballpark. Try setting R3 somewhere between 2.3k and 2.9k and see how it changes.
                I have my boards set differently, one seems to like 2.7k and the other is set to 2.5k and gets the best detection out of both with a better range of coil size and
                inductance.

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