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Pictures of Bill Lahr's first Whites Surf Pi. prototype, the inventer of the Surf Pi.

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  • Pictures of Bill Lahr's first Whites Surf Pi. prototype, the inventer of the Surf Pi.

    Last week, I was talking to a friend "Bill Lahr" here in California introduced to me by another friend "Jerry Talley" several years ago, Bill mentioned he had run across his original 1991 prototype for the White's Surf PI. He offered to send a couple pics of it, so I asked if he would mind if I posted them on the forum. He said okay, so here they are. Thought you might be interested in seeing them.


    Bill Lahr is the inventor of the Whites Surf Pi and designer of other detectors and created a 4-tone feature for the Whites 5900 & 6000 Di-Pro SL models as well, He still lives in Ca. but prefers to stay behind the scene to enjoy his retirement. The added on 4-tone feature to the Whites 5900 & 6000 Di-Pro SL models was something Bill did on the side and for friends only, He added on this 4-tone setup to my 6000 Di-Pro SL and what an improvement it had.

    In 1991, he tore apart a broken Surfmaster II someone had given him for parts, using the gutted Surfmaster II housing, he hand built a PI board to fit the case and from here Whites introduced the Whites Surf Pi and the rest is history. Now this is only a prototype but still similar to the Whites Surf Pi.

    He tore the Surf II coil apart and wound the PI coil into the case. (The old cases were glued together on top. Note the nylon bolt and wing nut. The Surf II had a metal screw back then.) White's sent him that label a few months later, when they were experimenting with different designs. They made a few minor changes to the circuit before they put it into production. The prototype was built in December of 1991 and, before you ask, yes, it still works.

    Bill is still proud of this prototype Pi and before we finished our conversion the other day, Bill said he is just a normal person like you and I........I say dreams can come true if one puts his/her heart into it like Bill did

    Paul (Ca)
    Attached Files

  • #2
    Barracuda | Surf | Deltha Pulse

    Hace algún tiempo yo hice un detector de pulsos que combinaba algunas partes de distintos esquemas... Sandbank, Garret XL500 y White PI-1000. Funciona bien, aunque su alcance no es grande, con una antena de 40 cm de diámetro logra captar una lata de coke a unos 45 cm, con 1mx1m logra captar objetos de unos 20cmx20cm cerca de un 1.30 metro.
    Ahora quiero hacer otro para ver si logro mejores resultados. Mi elección está entre el Surf PI, el Barracuda PI y el Deltha Pulse, pero no logro darme cuenta de cual es mejor para mis fines.

    Dicen que el Barracuda es mejor que el Surf PI y también que el DP es mejor, pero este último es mucho más complejo.

    Me inclino mucho por el Barracuda, pero no tengo el MOSFET Canal P y quisiera convertirlo para MOSFET canal N como el Deltha P.... es esto posible ???

    En el esquema del Barracuda el op LF412 puede ser sustituido por algun otro como el LM358, 324 o TL072, etc. ?????

    Incrementa mucho la calidad del detector poner un integrador diferencial en lugar de uno que no lo sea ????

    El sistema de SAMPLE & HOLD del Whites PI-1000 puede ser puesto en el circuito del Barracuda ??? esta sintonía automática es mucho mejor que la manual o es más exacta la manual ????


    Les agradecería mucho me aclararan estás interrogantes

    Saludos

    diminute

    AHORA EN INGLÉS SEGUN GOOGLE

    I do some time I made a detector of pulses that combined some parts of different schemes… Sandbank, Garret XL500 and White PI-1000. It works well, although its reach is not great, with an antenna of 40 cm of diameter manages to catch a coke can to about 45 cm, with 1mx1m manages to catch objects of 20cmx20cm near 1,30 meter.

    Now I want to make other to see if profit better results. My election is between Surf PI, the Barracuda PI and the Deltha Pulse, but profit not to give account to me of as he is better for my aims.

    They say that the Barracuda is better than Surf PI and also that the DP is better, but this last one is much more complex. I incline much by the Barracuda, but I do not have the MOSFET Canal P and wanted to turn it for MOSFET channel N like the Deltha P…. it is this possible one?

    In the scheme of the Barracuda op LF412 can be replaced by some other like the LM358, 324 or TL072, etc.?

    It increases much the quality of the detector to put an integrating differential instead of which it is not it?

    The system of SAMPLE & HOLD of Whites PI-1000 can be put in the circuit of the Barracuda? this automatic syntony is far better that the manual or is more exact the manual?

    It would thank for much to them clarified to me you are interrogative

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    • #3
      Thanks William

      Thanks Will for al the Schematics.

      Best regards.

      Comment


      • #4
        hola diminute un gusto

        hola diminute

        que bueno que escribes en español, espero lo sigas haciendo, dime de donde eres, yo soy de mejico, espero nos cuentes tus experiencias y que tipo de busqueda realizas y tu edad, ok estamos en contacto, espero que nos des algunos tips para aprender mas acerca de la deteccion un saludo

        detectoman mexico

        Comment


        • #5
          Hola

          Soy Cubano, 33 años

          Aquí la gente que le gusta la detección tienen que hacer sus propios detectores pues no se comercializan.

          No soy electrónico, soy ingeniero informático... pero me gusta este tema y he aprendido un poco de electrónica analógica.

          Mi sueño es participar en un proyecto donde se use una laptop para controlar y recibir las señales del detector, sobre este tema tengo algunas ideas.

          Saludos

          diminute

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