How To Make Metal Detector Headphones Operation Wireless - Tutorial, page 7
Make Digital Transmitter Case Waterproof/Dustproof/Shockproof
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My next step was to make a hole of a certain size for an 1/8" (3.5mm) male plug of the transmitter-to-detector connecting cable. As I mentioned above, the plug 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.
Use Soldering Iron To Make A Hole in A Bulge Inside Container
My plan was to insert the plug 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 plug'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.
Insert 1/8-inch (3.5mm) Phone Plug Into Hole
The plug's body must be inserted 1/3 of its length inside the hole - this must be done carefully, otherwise the plug would go all the way through, and the whole plan would be screwed up.
1/8" Phone Plug Is Implanted Into Container's Corner
To make the plug implant permanent, you may want to fill the dimple (outside the container) with epoxy. After the cable plug was set up, I used an 1/8" socket-to-1/8" plug adaptor set with a volume control, which was part of the dismounted old assembly, to complete the connection to the transmitter.
"1/8-inch Female-To-1/8-inch Male" Adapter with Volume Control Got Its "Second Life"
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. Some corded headphones for metal detecting do not provide enough audio volume, and nothing can be done about it!
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 adaptor set of a perfect length. The angled 1/8" male plug of the adaptor 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.