How To Make Metal Detector Headphones Operation Wireless - Tutorial, page 7

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My next step was to make a hole of a certain size for an 1/8-inch (3.5mm) jack of the transmitter-to-detector connecting cable.

As I mentioned above, the phone jack should be implanted into the container and form a 45 degree angle with the container's bottom. Inside the container, the dimple would be a bump with its peak pointing out exactly at the 45 degree angle if you place the container flat on its bottom. So, all I had to do was to make a hole through the bump's highest point. Again, I used a soldering iron for that purpose.

My plan was to insert the phone jack while the hole was still hot from the soldering iron. That would ensure a super tight fit, and neither water or dust would get inside the container.

Fortunately the iron's tip was a little narrower in diameter than the jack's body, so I easily accomplished my plan. Nevertheless, this procedure may be very tricky and could not be redone.

So, make sure that you know what you are doing and you are ready to do it before you start.

The phone jack's body must be inserted 1/3 of its length inside the hole - this must be done carefully, otherwise the jack would go all the way through, and the whole plan would be screwed up.

To make the jack implant permanent, you may want to fill the dimple (outside the container) with epoxy. After the phone jack was set up, I used an 1/8-inch socket-to-1/8-inch jack adapter set with a volume control, which was part of the dismounted old assembly, to complete the connection to the transmitter.

In addition to the metal detector's own volume control, the wireless headphone system provides two volume controls: one is on a headset, and another is on the transmitter. This is very convenient because three volume controls will sure allow you to make responses to targets sound loud enough and to your liking. Now it would be easy to deal with some corded headphones for metal detecting that do not provide enough audio volume

Not to have more than three volume controls in my setup, I decided to cut a volume control out of the female-male adapter set. Then I shortened the lengths of wires and soldered them; thus, making my modified adapter set of a perfect length. The angled 1/8-inch phone jack of the adapter set turned out to be extremely useful as it perfectly fit in the space available between the transmitter's control panel and the container's wall.

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