Cin-Tech pinpointer sensitivity boost!!!

Discussion in 'Electronic PinPointer' started by kydigger, Feb 7, 2010.

  1. kydigger

    kydigger New Member

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    I read this in another forum. I tried it and it turns the Cen-Tech into as good a pinpointer as the more expensive units.
    The key is that this unit was made for finding nails in wood, not coin shooting. By changing the factory settings you turn your Cen-Tech into a fine coin pinpointer
    Do an air check using any coin to see what distance you have at the factory setting.
    Open the box by removing the 4 corner screws. Don't remove the center screw.
    With the probe pointing to the left, you will see a little blue box on the upper right.
    You will see a little adjustment screw on top of that box.
    Turning that screw clockwise raises the sensitivity.
    Turn the external sensitivity knob about 1/2 turn.
    Turn the internal sensitivity screw clockwise until the unit sounds off.
    By doing a little tinkering with the 2 controls, you should be able to get the Cen-Tech to detect a penny at about 2 to 2 1/2 inches, a quarter at about 3".
    Be sure to leave a little play in the outside knob to help narrow your search once you locate your target.
    Let me know how this tweek works out for you.
    ________________________________
    Ron R.
     
  2. digmaster999

    digmaster999 Active Member

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    Cen Tect

    very good idea. I dont have one yet but going try to find one. Theres no harbor Freight near me. thank you for the info. ron,
     
  3. Mikey

    Mikey TQ's Underwater Pirate

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    Good info, thanks for the post. Mikey:bthumb:
     
  4. moondoggy

    moondoggy Member

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    cen-tek

    Just picked one up today.Good info.
     
  5. HOWDY

    HOWDY Active Member

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    good tip. their are many people here that use them. i had one but returned it because it would only detect about a 1/4 to 1/2 an inch. i think i'm gonna go buy another one now for a spare now that you told me this. :bthumb:
     
  6. tkcenterline

    tkcenterline Active Member

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    I have Centech and it works great. I will try this adjustment and see how it works. Before I do the adjustment. Can you please explain to me what the internal controller is actually doing? Right now, If I turn-up my external control knob (clockwize), it also turns up the gain, so that the unit will pick up almost any metal in the pile. Many times it is too strong and I have to turn it down in order to pin point a coin in the pile of dirt. Usally, I adjust the unit by turning the knob up until I hear a continuous sound, then back it down a 1/4 turn or until the sound stops. After the sound stops. I hold a coin near the pointer end, while turning it on and it usally rings off at about an 1-1/2" inch away (air test). That is how I have been adjusting the unit. So now, what will the new adjustment actually do and how will it better the preformance for me?? Thanks.
     
  7. r49miner

    r49miner Active Member

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    Sounds like another choice for those looking foe one, besides harbor frieght.
     
  8. Mikee5936

    Mikee5936 Member

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    Thanks for the post KYDIGGER!! I will try it on mine!!

    Currently I also do the same as TKCENTERLINE on mine....It's actually pretty strong. I turn it all way up until constant sound and then back down 1/4 turn.
     
  9. kydigger

    kydigger New Member

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    Thanks for the replys and "thank yous"

    I'm not sure what the internal adjustment is doing other than increasing the sensitivity. I just know I get better distance. I adjust the external sensitivity knob until I hear a shhhhhhhhhh. At that setting my Cen-Tech is just waiting for any metal to come near it. Like I said above, I get about 2 1/2". The, if I need to be more precise, I turn the sensitiviy all the way down. Then< it will only sound off aT ABOUT 1/2".

    I just made another easy improvement to make the sensetivity easier to adjust. I mounted a Radio Shack 1/2" Blue-Capped control knob, part no. 274-403, over the factory control knob. Now I don't have to use 2 fingers to adjust that tiny knob. It looks better too. (LOL)
    __________________________________
    Ron R.
     
  10. jbowl101

    jbowl101 Active Member

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    Great post.
    I use one, and couldn't be happier with it. Although I probably will try this tweek, It couldn't hurt.
    On my last hunt I found a big piece of one of the old hood ornaments, it showed up under zinc penny. So I figured it probably wasn't too deep, I'd try my pin pointer and just dig it out with my finger. Well, it was about 4in. Down and the pin pointer was picking it up!! I was blown away, it was a pretty big hunk of metal though. But still... For the money you can't beat 'em (IMHO anyway)

    Jamie.
     
  11. ahisey

    ahisey Member

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    well, i'm new to metal detecting, but pretty handy with electronics and the like. i bought one of the centechs and just opened it up and fiddled with it. the component in question is a potentiometer and my guess is you can adjust the threshhold of what the detector needs to sound off. the detector unit is basically a magnet that creates a small voltage and adjusting that pot will create a smaller drop in voltage going to the circuit that runs the speaker, therefor you don't have to encounter as large a magnetic field to get the same result. this increases the units "sensitivity". good tip by the way, i can get a penny at about 2" and a nickel at about 3 1/2 to 4" versus about 1/2" and 3/4" before. plus i left enough room on the outer adjustment to turn it way down and get better pinpointing. thanks!
     
  12. Mikee5936

    Mikee5936 Member

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    Welcome to TQ ahisey! Thanks for the Technical info!
     
  13. ahisey

    ahisey Member

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    okay, one downfall i found to this mod is as follows. for some magical reason the unit will retain memory and will begin to sound off as soon as you turn it on after encountering a coin a few times, but it is easily solved by turning the outer sesitivity down all the way and then turning it up to the point where it sounds and then backing it off a hair until the beep quits each time you want to use it. i actually played with mine a little more after making my last post and i can reliably detect a nickel at about 8 to 10" but you must recalibrate the unit each time by following the above procedure of turning it down and back up and down a little, no big deal to me since i paid $16 for my first pinpointer. i guess i'm not spoiled yet. or i might have been pushing the unit too far and not using it right. after several tests, it works just fine for coinshooting.
     
  14. tkcenterline

    tkcenterline Active Member

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    Very good Tip. When you make this change, you get a solid reading on coins 2" away or more. I turned the inside adjuster clockwize a little less then a 1/2 turn (I took a filt pen and marked the original location of the srew to the box). Although you will lose the range of the outside controller by a 1/4 turn, I still get a 1/4" turn adjustment to turn the sensitivity down a little. I can live with that when the pinpointer is finding coins strong at 2" away or more. What more to you want for a pinpointer? This change and the other changes I have made to this Centech unit, makes this a top of the line pinpointer and as good as any other pinpointer that I have see in action. Plus, It only cost me $15.00 and you get a led rearch light in the front of the pinpointer. I am so glade that I bought 2 Centechs at the same time and have the other for a spare. Thanks for the great tip and it really works!!
     
  15. jbowl101

    jbowl101 Active Member

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    I love my Cen-Tec. I get decent depth as is, but I do think I'm gonna tweak it a bit. Anyone had any trouble with it in the cold??
    It seems that mine doesn't like it when its under about 35-40 deg. Soon as it warms up I'm off and running though.
    Not complaining just noticed it over the last couple of days.

    Jamie.
     
  16. Garlydog

    Garlydog Well-Known Member

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    Good stuff. I will have to try this.
     
  17. r49miner

    r49miner Active Member

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    Real good stuff thanks for posting and sharing your findinds and tweeks.
     

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