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  • PI Front-end PCB

    Back in June, I had intended to follow up with my plan to make some front-end PC boards for PI experimentation. This was originally proposed in this thread in January.

    As usual, this whole thing slipped way down my to-do list. About 6 weeks ago, I dug it all out, and sent off for PC boards. They took longer than I planned, but have arrived. Image below.

    These are from a different PCB house than Hammerhead, I wanted to try them out because they are a little cheaper. The board turned out really nice, silkscreened on the component side and has a solder mask. The only drawback is that they only do one size component holes, so some holes (FETs & headers) will have to be over-drilled.

    I have 50 of them. Like the Hammerhead PCB, I will sell them roughly at cost. For US/Canada/Mexico, one is $6 or 2 for $10, includes shipping. Everywhere else, please add an additional $2 shipping (i.e., 1=$8, 2=$12). Because I only have 50 I will initially limit each person to 2. Paypal preferred.

    - Carl

    Paypal ID is [email protected]
    Attached Files
    Last edited by Carl-NC; 12-26-2005, 02:53 PM.

  • #2
    Hi Carl,

    Great and interesting site! Makes me want to build something!

    Just a passerby with only a passing familiarity with metal detectors so I have a question: why do you have a "double coil" setup on your experimental board, in which both coils apparently transmit and receive?

    I had the impression that the idea of a double coil system was to isolate the receive coil from the transmit coil, i.e., one transmits, the other receives.

    Thanks for any help in understanding this.

    Passerby

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    • #3
      There are two ways double-coil PIs have been designed. One is the way you mentioned... pulse the TX coil and listen to the RX coil. Another is to pulse both coils, and listen to both coils, as is done in Gary's PI project. I set up the front-end board to do it either way.

      - Carl

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