Connector types
What types of connectors are there and what influence do they have on the power supply of the aviation headset?
1) PJ plug
This plug is also called twin plug, double jack plug, twin pug or general aviation plug. It is used with passive headsets and headsets where the ANR is battery powered. Although the plugs look similar, the microphone plug (also called PJ-068) is thinner and has a slightly different shape than the audio output plug (also called PJ-055). This helps to avoid confusion when connecting to the intercom. The PJ connector is one of the most common configurations and is used in many general and commercial aviation machines.
2) XLR5 connector
XLR connectors are considered the industry standard for electrical connections and are used in aviation with a 5-pin design. With this connector it is possible to supply the ANR of an aviation headset with power from the on-board power supply (provided that the XLR socket in the cockpit has power access).
3) LEMO connector
The 6-pin LEMO connector is becoming more and more popular. You only need one connector (space-saving), can supply the headset with power and the plug can not simply slip out due to its secure push-pull locking.
4) U174-Stecker
If you fly helicopters, you need a headset with a U174 plug. This plug is shorter and thicker than PJ plugs and transmits both signals: earphone and microphone. The diameter is 7.1 mm.