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  • I have made PCB designed by ApBerg and it was not working ... no sound at all
    Changed NE555 to TS555 still same.
    Only if I touch IRF9640 I get some sound in headphones ..
    I get huming sound when I touch volume pot - connected to darlington transistor
    or when I touch both IRF and that pot pin I get sound like I shoul'd have if found metal
    from youtube test videos...

    R2 trim pot is now 3.3k resistor

    Voltages
    TS555 pin 4 and 8 is 12.10V
    IRF9640 S leg has 12.1V
    7660 has -4.36V on pin 5
    7660 has 5V on pin 7 (and 8 ?)
    4093 has 5V on pins 1, 9, 12, 5, 14
    4093 has -4,35V on pin 7
    4066 has 5V on pin 14
    4066 has -4,35V on pin 6, 8, 9 unused part
    4066 has -4,35V on pin 7
    358 has 5V on pin 8
    358 has -4.35V on pin 4

    I am using 0,4 mm enamelled copper wire 23 turns - 22 cm diameter 2.8 Ohm at PCB and 2.3 Ohm at coil
    Don't have inductometer...
    Don't have oscilloscope... yet

    Comment


    • changed bc879 to MPSA13 with orientation right and I got siren with variable volume - volume pot is working
      with or without coin it is siren
      pots are not responding
      offset trimmer also does nothing
      I have 55mV at coil

      Comment


      • PCB and parts side

        Click image for larger version

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        • Is this the surf pi duel field that whites sells?

          Comment


          • this thread is marked Surf Pi Pro
            it's simplified version of SurfMaster Pi (Pro)

            Comment


            • What is the difference between this and the surf pi duel field?

              Comment


              • Originally posted by dfxmadness View Post
                What is the difference between this and the surf pi duel field?
                dual field one is selling for more price.

                Comment


                • Can I convert Surf Pi Pro to Surf Pi
                  using Surf Pi Pro PCB by disconnecting parts ?

                  Comment


                  • Surf Pi Pro - no siren when I disconnect tc555.

                    Also if I replace C1 22nF with different one it changes sound frequency,
                    if no C1 is connected there is no sound.
                    Then Sens pot has some effect - from silence to weard sound...

                    Anyone ?

                    Comment


                    • sdesic I think that cascade with 555timer and IRF9640 not work correctly. Change search coil on the speaker. If you listen sound -use frequency meter. If frequency from 400 to 800 Gerz - your surf work properly.The generation after 555 maybe interrupted if IRF not open\closed and not full open closed.///
                      But second version - local electromagnetic field(hitch) ///walk to park\forest and check construction.

                      Comment


                      • Coil and other thing are not moving in relation to each other.
                        Without coil there is same sound.

                        Comment


                        • Many trifles can give similar effect.
                          For example gumboil. Though the producer writes that gumboil doesn't demand washing. And upon washing it is necessary: simply after the soldering there is resistance between paths which aren't connected with each other.
                          As a result on megaohms pro-calls appear figures... And they shouldn't be
                          And still council: you can simply disconnect a delay from work of the 4066th chip.
                          For this purpose you should disconnect temporarily R3 from the 555th chip.

                          Comment


                          • I to you once again repeat: seal the loudspeaker instead of the search coil. It is admissible during control and will help to solve your problem.
                            Still try in the following places according to the scheme:
                            4066 pin 11, pin 2, pin 4. The same will sound there as in the coil. Disconnect R3. If on pins 11,12.4 no signal - then delay cascade work.

                            Comment


                            • You say to disconnect R3 and to try powering without it ?

                              Comment


                              • R3 disconnected no sound in headphones.
                                When volume is max there is sound - faint constant sound like siren.
                                I think volume pot is heating up.
                                Pin 2 4066 has 0V
                                Pin 2 4066 has 0V
                                Measuring pin 11 on 4066 produces siren in phones.

                                Comment

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