MFM3 pinpointer

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MFM3 Pinpointer

Here you can download for free MFM3 app!

MFM3 Pinpointer

MFM3 is a metal detector app (pinpointer) with metal discrimination. When we put a metal object near to the coil the frequency changes and in this way the app detects the changes of the frequency and when there are changes it detects that there is a metal object nearby. This pinpointer is capable of distinguishing ferrous metals from non-ferrous metals.This app works with the help of a small circuit (you can find it below).  The circuit is fed from 3.5v to 5v.  The circuit is very small and is made with easy-to-find components. To know about new updates and new projects, subscribe to my YouTube channel.

Components we need:

  • A cable.
  • Resistance 10k and 100R
  • Capacitor of 220nF
  • A smartphone.
  • MiniJack 3.5 mm 4 pins.
  • Transistor BC557 (2 units.)
  • Capacitor of 100nF*

Schematic

To test different configurations we can change the C2 value to get different working frequencies, in the app we can see the frequency of work and how the frequency changes when we change capacitor C2. In the menu of the app we can also choose the precision. The best precision to select the highest but if your smartphone is not able to work with this precision we can choose the low precision.

More information coming soon!!!