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Recent content by Smitty II

  1. S

    My Home Built PI Detector

    Greetings Everyone, I have been detecting since the late 60s and probably have designed and built every type metal detector out there. That may be a bit of an over statement but at least the major types. My latest project is a PI machine. I thought at least some of you might be interested in it...
  2. S

    Homemade Detector

    Greetings, While out using the home made PI detector that I posted a series of posts on I met Ken, another treasure hunter. He is also an engineer and we spent some time talking detectors. During the conversation he said now that you and built the one you have, if you built another one, would...
  3. S

    Home Made PI Detector 5

    Greetings, Maybe I can finish up with this installment. Since I reduced the gain in the receiver preamp It is obvious that I need to get the gain back up in the back part of the circuit. After the target signal and the second sample are gated through the gating IC they are amplified 330 times...
  4. S

    Homemade PI Detector 4

    Greetings, This is the 4th installment and I hope I am not boring to many. The nice think about a forum is that if something isn't of interest to you, you don't have to read it. The target sample and second sample timing circuit including the gate switch IC is basically the same as Carl...
  5. S

    Homemade Detector 3

    Greetings, OK! I have attached the schematic for the VCO version. It is the one in the pictures on the other postings. As I indicated in my first posting it is a take off from Carl Moreland's Hammerhead design. As I go through the circuit I will explain the differences and the reasons behind...
  6. S

    Homemade PI Detector 2

    Greetings again, Since 6666 expressed an interest in the circuit that I ended up with for my homemade PI I will what I came up with. I will also pass along some of the thoughts behind what I did. This was a learning process for me and some of my thinking may be off base and some of you might be...
  7. S

    Home Made PI Detector

    Greetings to everyone, It has been a long time since I have been on this forum. I have however, been busy and not idle. Quite some time ago I took on an educational project for myself. I decided to build a PI detector to better understand the technology and it's critical characteristics. Being...
  8. S

    Out again with my AT Pro

    Greetings to all, I managed to get out again with my new AT Pro just before the snow storm hit this weekend. I just took it to a park and hunted for a little over an hour. I started out in the Standard Mode and the Discrimination Mode set to Coin.I ground balanced the detector and it indicated...
  9. S

    Proper way to set the X-Terra Volume control

    Greetings to all, It has been a while since I have been on this forum but that's the way it goes some times. You always hear that the proper way to set your volume is to run the detector a full volume and use the headphone volume volume to keep the loudness at a comfortable level. Well...
  10. S

    The X-Terra 70 is a Great Gold Machine

    Greetings to all. Sometime back "Landman" posted the question, "Is the X-Terra 70 the best gold Machine?" I have to agree with Steve Herschbach when he said "There is no such thing as a best gold detector". However, don't sell the X-Terra 70 short. Minelab is known for designing the leading...
  11. S

    Infinium LS in the parks

    Greetings to all, I saw a few posts down someone wanting to know about using the Infinium for coin hunting. I use my Infinium in the parks, schools, volley ball courts and play areas quite often. Normally I use the 5"x10" DD coil because it handles the city interference noise better than the...
  12. S

    Nugget hunting with the X-Terra 70

    I purchased the X-Terra 70 because it not only had an excellent coin and jewelry mode but because it also has a full blown excellent prospecting mode.I have done very well using it hunting for coins and jewelry but just before Christmas I had a chance to really see how it would do prospecting. I...
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