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Surf PI Pro

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    • Desoldering components from old detector I noticed that offset trimmer 100k is only 87k ... that is one of problems ?
      Can it be used or I must search for new one ?

      Assembled almost everything on new PCB, still need to connect pots and coil.

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      • That is within the Tollance of 20%.

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        • homefire, thank you, I didn't know that is in tollerance.
          Resistors are mostly 5% tollerance

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          • Silence is golden (?) from metal detector band
            Just finished my PCB 2 soldering and started device and nothing... same voltages as should be.
            Must aquire few ICs.

            LM358P is going to recycle bin.
            His friend NE555N also ...

            Rest of them ICs...
            NE5534P
            SMD one (7660) is working fine, giving out -4.0-4.5 V
            HEF4066BP NXP and HEF4093BP NXP

            Comment


            • Originally posted by sdesic View Post
              Silence is golden (?) from metal detector band
              Just finished my PCB 2 soldering and started device and nothing... same voltages as should be.
              Must aquire few ICs.

              LM358P is going to recycle bin.
              His friend NE555N also ...
              If I am not mistaken, "N" and "P" regarding LM358, that is simply two different manufacturers' different methods of expressing the plastic DIP package, and those two letters imply NO electrical differences between them.

              LM358N = plastic DIP (manufacturer "x")
              LM358P = plastic DIP (manufacturer "y")

              Each will be stamped with a different manufacturer's logo. (I am in a hurry or I would chase down more details).

              Now perhaps one or the other of the manufacturers has a better process and thus produces better product, so if you want to believe that the LM358P is inferior, that is OK. Interesting possibility.

              I will be a good thing to replace any NE555 with a CMOS version from one manufacturer or another. Which manufacturer (and which prefix they use) will make little or no difference so long as it is CMOS, and not old style bipolar technology (usually with either NE or LM prefix).

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              • Originally posted by sdesic View Post
                Silence is golden (?) from metal detector band
                Just finished my PCB 2 soldering and started device and nothing... same voltages as should be.
                Must aquire few ICs.
                Please, DO buy a scope, 2-channel if possible.

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                • LM358P

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                  • LM358N

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                    • LM358P
                      20nA
                      3mV
                      1mA
                      30mA

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                      • LM358N

                        20nA
                        2mV
                        700µA
                        60mA

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                        • You might be right, but please, WHERE are you getting this from??

                          Like I said, you may be right but on the other hand, these are "nutshell" specifications you quoted. It could amount to (Newark, or Futurlec, maybe?) using personnel from their catalog division to convey electrical specifications that they know little about.

                          Could be the difference between one manufacturer listing "minimum" specs and another manufacturer stating "typical" specs which would amount to an unfair comparison!

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                          • How can I use CAT-T cable for coil for PI PRO?
                            I have seen some designs and solutions, has anyone tried on this model ?
                            Please post data - how much cable and how to interconnect them.
                            Thank you.

                            Comment


                            • sorry CAT-5 network cable not CAT-T.

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                              • hello

                                i finished two boards of surf xx (appies version)
                                and they work

                                did i have to set multimeter an AC or DC measurement when setting Offset trimmer and measure positive rail and pin6 on ne5534?
                                normally i have multimeter on DC but this time i can measure high voltage values up to 11V (range 2-11V) while measure and trimming the offset trimmer
                                what can be the reason if i cant set it to "0" volt
                                should i go outside far away from any metal? how is i done by the commercial builders do they go off their producing rooms to set the machines

                                so
                                how do i connect the multimeter right and how do i make the offset setup procedure

                                in the past i have seen that the best positon is not around zero volt (accordig to coil 2-4V)

                                seems that i have not fully understand the thing and i walk in the dark

                                so thanks for tips

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