How To Make Metal Detector Headphone Operation Wireless - Tutorial, page 8
Make Digital Transmitter Case Shockproof
After an adapter was plugged into the digital transmitter, the female socket of the adapter was connected to the male plug of the transmitter-to-detector connecting cable.
Adapter is Connected to Outside Transmitter-To-Detector Connecting Cable
Now, even though not much wiring had been done, it was essential to check if everything was working fine. I plugged the connecting cable into my metal detector (your metal detector must always be OFF at this moment!), turned on the Sennheiser wireless digital headphone system RS-160 (with batteries fully charged), and then turned my metal detector on. Everything worked fine, and I could proceed further.
It is important to carry out a few intermediate QC (Quality Control) check-ups during any project that involves electronics. This usually saves you lots of time if something has not been done right, and you need to determine at which point of the project a mistake was made.
The transmitter does not have any moving parts inside; however, it is always best to be "on a safe side". To protect a digital wireless transmitter from accidental shocks and bumps that may occur when a metal detector is operated or a search coil hits an obstacle, I used a piece of packing foam that would serve as an antishock cushion inside the container. I also cut an opening in the cushion to make some room for the adapter set's wire so that it would not be bent under pressure every time the container's lid is closed.
Use A Packing Foam Pad of Certain Size as Cushion Against Shocks and Bumps
With the lid being closed, the foam pad would press on the digital wireless transmitter and would not let it tumble inside the container every time one would swing a search coil. And if an accidental drop of a metal detector happens (like when your mother-in-law with a shovel suddenly appears in front of you), the transmitter would not collide with the container's hard plastic and get cracked.
Packing Foam Cushion Took The Rest of Empty Space Inside Container