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Hi all;
I just finished the Stuart project and it's working but with a different manner.
I get in the output a very high tone sound wich disappear or decrese very substantially at the detection of a metal. I havn't succed to determine why
.
but sensibility seems to be very good. i can detect a 1Euro at 20cm. 1cent local (1cm diameter) at 18 cm. hammer at 30cm.
When i try to put my threshold at no sound clicks appears when metal is detected but at very low distance 2cm from coil.
I f any one can help ?
I replaced 4011 by 2*4012, and i used NE555
I just finished the Stuart project and it's working but with a different manner.
I get in the output a very high tone sound wich disappear or decrese very substantially at the detection of a metal. I havn't succed to determine why
.but sensibility seems to be very good. i can detect a 1Euro at 20cm. 1cent local (1cm diameter) at 18 cm. hammer at 30cm.
When i try to put my threshold at no sound clicks appears when metal is detected but at very low distance 2cm from coil.
I f any one can help ?
I replaced 4011 by 2*4012, and i used NE555
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