Mini metal detecror (colpitts oscillator)

Published:2012/9/13 21:04:00 Author:Ecco | Keyword: Mini, metal detecror, colpitts oscillator | From:SeekIC

The circuit uses two CMOS IC’s IC1 uses inverters connected as a Colpitts oscillator of 100KHz; the LC frequency determining elements being the search coil and parallel resonating capacitor. An 80 turn close wound 30swg 100mm diameter coil will fit inside the CD case. I will leave the choice of the IC to the reader: this can be any of the well known CMOS inverters or NAND, NOR gates etc configured as an inverters. The choice is yours, use whatever you have on hand. IC2 can be either 74C00 or 4011 quad NAND gates. Source: NEXT.GR



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