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Offline RevisedTopic starter
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« on: February 21, 2010, 05:41:10 pm »
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Hello to everyone.

I?m working a Frankenstein type of project taking features from different detectors that I like and redesigning the things I don?t like. I have built 4 PI detectors from plans off the net, all 4 use a 555 timer in the audio circuit all had feedback or over load issues destabilizing the detector. It may just be my Achilles heel but some would work OK others would not, even had one burn up in a few minutes in a working detector.  My new audio will be based around a XR2209 voltage controlled oscillator that can generate a square or triangle wave from 1HZ to 1MHZ. Next on the list use a Mosfet driver either a MAX4420 or MCP1407. Two stage preamp with high and low pass filtering. There a few projects on the net that use Pic chips with published code. PIC chip for timing functions to start with. Where I?m stuck I would like sum type of ground balance. I?ve found a lot of information on what it does and why it?s needed but nothing on how it?s done in a PI detector. Do any of the projects listed here have a ground balance circuit if so witch one and could someone describe how it works.
 
Any and all input appreciated.
 
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Offline GoldDigger1950
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« Reply #1 on: February 22, 2010, 03:19:55 pm »
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PI detectors don't need ground balance. By their nature, they ignore mineralization in the soil.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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