XP Deus 2 Transmit frequencies

[Riss]

Then you are likely to write original software. the goal is more coins in the pocket.

[Marchel]

Then you are likely to write original software. the goal is more coins in the pocket.

It took me a lot of time and attempts to build a functional metal detector that still needs to be developed.

[Mark-VA]

For detector fields you don't need to go that low. Here is the (more) complete circuitry for my field probe:


For the sensor, I use a Wurth 7447480331 which has L = 330uH and R = 0.3Ω, or a tau of 1100us. This is plenty low enough (145Hz) for detectors. Here is the measured field for a Vanquish 540:



The slight bowing you see in the B-field waveform is due to the resistance of the Vanquish's TX coil, which has a tau of 260us.

ITMD-3 Appendix A will give all the details for this probe. Soon.

Does the lead core of the Wurth 7447480331cause the detector to detect an overload?

For the sensor, I use a Wurth 7447480331 which has L = 330uH and R = 0.3Ω, or a tau of 1100us.

[Carl-NC]

The inductor has a ferrite core and, yes, if you get it too close to the coil the detector might overload. That doesn't alter the TX signal, tho.

[JoyJo]

What is the significance of the RD resistor?

[Carl-NC]

It's a damping resistor to tame unintended oscillations. I use 1k.

[Altra]

Hi Carl, I can see in your circuit a lot of attention to precision. Are you able make actual current measurements? If so, do you need a fixture to hold the tx coil and sensor at some fixed orientation and spacing? Thanks for posting these circuits.

[Carl-NC]

No, you can only measure field strength. The probe can be calibrated to measure absolute field strength in Teslas and this can be used to calculate the ampere-turns, but not the amperes or the turns.