Announcement

**Carl-NC** · 11-12-2021, 07:23 PM

For a mono coil L should be around 300uH and R should be less than 3 ohms or so.

For DD, the TX coil should be the same as the mono specs above. The RX coil has more flexibility; you can make it the same as the TX, or you can increase L to, say, 600-1000 uH and see if you can get it to settle. It will take some experimentation. If you can, the extra windings should improve sensitivity. R is not as critical on the RX coil.

**kadir6141** · 11-12-2021, 08:16 PM

Thank you very mucy.I will try

**kadir6141** · 11-13-2021, 04:07 PM

Mr.Carl-Nc can you dual field coil information about

**Carl-NC** · 11-13-2021, 08:11 PM

The patent explains it:

US7994789B1 - Dual field search coil for pulse induction metal detectors - Google Patents

https://patents.google.com/patent/US7994789B1/en

A new dual field search coil for pulse induction metal detectors has multiple coplanar wire coils of different diameters connected in series with the output of a pulse source, overcoming the loss of target size resolution associated with a single coil search loop. Small objects are sensed by an internal small coil and larger objects are sensed by the larger outside coil, and the overall depth of target sensing remains similar to that of a single coil construction. The smaller coil is isolated from the pulse source by the inductance of the larger coil and will ring at a frequency determined by its own parameters. To prevent the smaller coil from ringing, a second damping resistor is connected across the terminals of the smaller coil at the junction of the large and small coils making up the modified search loop.

**kadir6141** · 11-14-2021, 04:16 PM

Thank you very much. Mr. Carl

**kadir6141** · 12-04-2021, 02:50 PM

**kadir6141** · 12-04-2021, 02:52 PM

Can you help me how will the tdi coil connection be?

**eclipse** · 12-04-2021, 05:10 PM

Seems you bought TDI SL board from Orbit.

**kadir6141** · 12-05-2021, 07:11 PM

Can you help me connector diagram.

**Carl-NC** · 12-05-2021, 10:10 PM

In the coil connector, pins 2-3-4 connect to the "+" side of the coil, pin 1-5 connect to the "-" side + shield.

**kadir6141** · 12-07-2021, 01:07 PM

Thank you very much. Mr. Carl-Nc .l am try

**kadir6141** · 12-13-2021, 12:23 AM

**kadir6141** · 12-13-2021, 12:28 AM

**kadir6141** · 12-13-2021, 12:32 AM

I couldn't solve tdi sl connector.

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Whites tdı sl coil

Whites tdı sl coil

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