Quote:
Originally Posted by Fred
Magnetometer is for magnetic anomaly 
I dont understand either, i am making a comment about your circuit.
Of course with a LDR or photo transistor you could detect changes in voltage input, but that would be a very complex way to make a trigger.
Regards,
Fred. |
Magnetic anomaly for a single coin is small. For absorptive LRL type (pasive) the rule is few turns wire for non ferrous metal. I wound in ferrite core 5,000 ohms and probe as electronic LRL. What happens? Nails and stainless steel coin I found at max. 1.5 meters distance.