Church policy is that every building, stake or not, has an EJ-8. If you have an older building it may have an EJ-10. They’re essentially the same except the EJ-10 has a phone connector.
The EJ-8 is supposed (Knowing that ‘supposed to’ and reality are not always the same.) to be in the library with the other loose sound equipment (handheld microphones, microphone cables, hearing assistance receivers, etc…). The librarians are supposed to (see ‘supposed to’ reference above) check the sound equipment in and out the same way they do the chalk and crayons. All members should have access to the sound equipment from the library when they need it.
If your building does not have an EJ-8 please have the agent bishop contact the stake and have the FM provide one. We’d like to keep sound system devices within standards so the systems are easier to maintain and trouble shoot when needed.
The following link has a good description of the EJ-8
https://www.lds.org/callings/melchizede ... r?lang=eng
Connecting an iPad or almost any other tablet or smart phone is a fairly simple process with the EJ-8. The iPad has a headphone connection at the top that will accept a 3.5mm connector. Simply find the 3.5mm connector on the EJ-8 and connect it to the iPad, then find the other end of the EJ-8 cable and connect it to the EJ-8. The microphone connector on the EJ-8 can then be connected to any sound system microphone input in the building. The EJ-8 has a volume control that is used in conjunction with the volume controls on the iPad and building sound system.