TDA0161 Metal Detector

  
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This particular circuit was built with an LED Indicator. There are Two LED`s Shown in the Schematic, Both do Exactly the same thing. I was just Playing with it. Advanced Schematic-2 This Modification in Advance Schematic-2 `Will Make this detector More Sensitive`, by using a `Manual Reset` to help eliminate the IC`s, `Built in Hysteresis`. Use Sta
TDA0161 Metal Detector - schematic

ndard Trimpot for the 10K and 1K Adjustments. Note: Other Coil values can Also be used, if you also use the Appropriate Values for the Trimpots and "CX" Capacitors. These are the values I used. 1) Make Sure there is NO METAL Near the Coil. 2) Set the Fine Adjustment to a "Mid Position". 3) Adjust the Course Adjustment to "Just Turn on the LED" 4) Than adjust the Fine Adjustment to Turn OFF the LED. 5) Now "Very Carefully" adjust the fine adjust to "JUST TURN the LED Back ON" and take "Careful Note of this Setting Position". 6) Now Just Back off this Setting a "TINY BIT". Pushing the "Manual Reset" Should now Turn Off the LED. Than Placing metal towards the coil will turn it back on. Pushing the Manual Reset, again turns it Off for doing another search for metal.



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