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TESORO GOLDEN SABRE

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  • Ne koristim nikakve formule. Namotam zicu, izmerim, domotam ili odmotam, izmerim.... iz prakse znam da ce indkutivnost porasti za malo kada stegnem namotaje dobro, kasnije. Koliko ce porasti induktivnost....to zavisi od precnika zavojnice...opet nema formule vec se utvrdjuje empirijski. Na primer, zavojnice D oblika za DD sondu od 27cm, skoro po pravilu posle stezanja zice dobiju na induktivnosti skoro za pola mH. Dakle namotam D oblik i doteram da induktivnost bude 5.6mH i kasnije kada pritegnem zice dobije se 6mH. Ili oko 6.1mH da bi se dobilo 6,5mH posle stezanja zica. To vazi za tu velicinu i oblik sonde. Za omega sondu verovatno vaze sasvim drugacija pravila. Jednom sam jednu namotao i radila je ok. Ne secam se niti broja namotaja niti ostalih podataka. Ima ovde na ovom topic-u nekih podataka. Pretrazi. Mislim da sam tada zapisao i objavio podatke za tu sondu.


    I dont have such forumula. I am not using any formula. All i done so far was by previously established experience. Usually inductance will rise for 0.4-0.5mH when tightly constrain windings after. But this is not the rule for all possible diammeters. Only for 27cm DD coil. However, i havent noticed any significant inductance changes when Al cage was applied later. So only important changes will occur when windings are later constrained.
    So...i can only give here one example; coil i done so many times, and already established accurate rules. Coil 27cm DD when making; keep inductance 0.4-0.5 mH lower when wounding so to gain proper inductance later when windings are constrained. This further means you must achieve 5.6mH for TX and 6.1mH for RX. Later when constrained and Al cage applied you will get almost exact 6mH for TX and 6.5mH for RX. Doesnt really matter if final inductances varry for some 0.1mH, dont worry. More important is to keep same ratio between RX and TX, some 0.5mH. Less or more differences will cause lot of problems later when coil is about to be balanced.
    But speaking of omega coil.... i dont know exact ratio. I havent done more than one omega coil. At the time i achieved proper inductances with adjusting number of windings and conctant measurements. So i dont know the ratio. Ratio for 27cm DD coil is NOT the rule for any other diammeter and shape.

    Comment


    • Again thanks!
      I'll do so!!!

      Comment


      • Hi !

        ICL8038 and 566 are obsolete and difficult to find.

        They are replaced from MAX038.
        You can found the datasheet here:
        http://datasheets.maxim-ic.com/en/ds/MAX038.pdf

        Bye,
        Marco



        Originally posted by Max View Post
        Hi,
        yes you could add a general purpose oscillator... with variable freq. from e.g. 1KHz to 20KHz and variable amplitude of 1Vpp to e.g. 10Vpp... I think the easy and best thing could be :
        - a bf oscillator Wien type
        - some ic like ICL8038

        + some power stage (class A transistor amplifier)

        That way you have really good shaped sinus and stable frequency on the BF region... and also really few distortion from end stage.

        Maybe the ICL8038 could drive coil directly... using some small impedance matching component... so saving also the work to make output stage.... or one could use also some old small function generator to do the same... maybe just dismantling board and enclose everything in a single box (osc+meter stuff).

        The advantage of using an old signal generator (like e.g. some 70's HP I have in mind) is that you could also pump a sweeped signal to trace self resonance of coil... by meter !

        But it will become more complex of course.

        Best regards,
        Max

        Comment


        • Hi !

          It is better to replace 1N4148 with 1N5817 for D6 and D7.

          It is necessary to use LOW ESR electrolytic capacitors for C4 and C5.
          For example you can use Panasonic cap:
          628-3807 or 526-1373 or 315-0467 from www.rs-components.com
          These code are only for example.
          Choose Europe in RS for look and read datasheets.

          Bye,
          Marco
          Attached Files

          Comment


          • Good day! What TGSL better (or worse?) Eldorado?

            Comment


            • And again: what is the difference from TGS and TGSL?
              BR, MS.

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              • You must be very lazy!? Why dont you read this thread from first page and try to understand. You have more answers here than your questions covers. It is nonsence to repeat same old facts to every newcomer - who is lazy to read! Also you may register here and than dare to ask questions. You dont deserve any regard acting like that. Of you go now and stay there!

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                • I am sorry that disturb you. I find it difficult to read texts in English. WordTranslator much distorted.

                  Comment


                  • Oh well than, choose language and say what you want to know.
                    And register here.

                    Comment


                    • Originally posted by Unregistered View Post
                      Oh well than, choose language and say what you want to know.
                      And register here.
                      Why don't you register yourself?

                      If you're having problems registering, then look at the top of the Forum list where it says "Can't Register or Log In?" ... and read it.
                      Don't forget to supply the username that you would like.

                      Comment


                      • I am already registered. From time to time i have habit to post ad unregistered. Don't ask me why, i have my reasons. But if you insist i can explain to you in pm. I have enough respect and trust in your discretion.

                        Comment


                        • Originally posted by Unregistered View Post
                          I am already registered. From time to time i have habit to post ad unregistered. Don't ask me why, i have my reasons. But if you insist i can explain to you in pm. I have enough respect and trust in your discretion.
                          OK - enough said.
                          Please try to follow the rules of the forum from now on.
                          Thanks.

                          Comment


                          • Originally posted by Qiaozhi View Post
                            OK - enough said.
                            Please try to follow the rules of the forum from now on.
                            Thanks.
                            Hi,
                            yeah, right... that's the problem here: too many unregistered...

                            I think that's maybe not a bad thing if people here register first of making a big mess of questions.

                            Kind regards,
                            Max

                            Comment


                            • Originally posted by Max View Post
                              Hi,
                              yeah, right... that's the problem here: too many unregistered...

                              I think that's maybe not a bad thing if people here register first of making a big mess of questions.

                              Kind regards,
                              Max
                              Hi Max,

                              Welcome back!
                              Is this a temporary visit or a more permanent one?

                              Comment


                              • Originally posted by Qiaozhi View Post
                                Hi Max,

                                Welcome back!
                                Is this a temporary visit or a more permanent one?
                                Hi,
                                thanks. Well I'm still into big troubles but hope I will be here with more permanent behaviour than last weeks.

                                You know, sometimes troubles add to troubles in a kind of sad math... no matter what you do, anyway that's enough to pull out the hairs sometimes and forget about metal detectors.

                                As an example I had to temporary dismantle my lab... at home ...everything packed and stored in a safe place... but what a crazy work! and so I can't even solder two wires at now! Hope will recover all that stuff sooner or later...

                                The good thing is that I don't lose interest in all that crazy forums here and sure... in good people's posts!

                                Kind regards,
                                Max

                                Comment

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