The following instruction is only useful for electrically talented people. No liability is assumed for damages resulting from this!
Right from the backpack I would like to operate my radio. An important prerequisite is to guide the loudspeaker outwards. So what is closer than a Speaker Mic to use. However, a microphone with a corresponding plug I could't find. Now a 3 $ Speaker Mic is successfully connected to the FT-817. At the cheap microphone I cut off the original plug and I made further modifications. The existing LED is replaced by the microphone capsule and the series resistor is bridged. Also a 3/4 piece of a paper handkerchief was used inside the Speaker Mic for sound insulation. Of course, there are more high-quality Speaker Mics on the market, but the result is notable after the modifications.
The RJ45 plug and the inner life of the jack plug are fixed with a few drops of super glue from the inside of the Plug. The final wiring with the coupling capacitor and the resistor are soldered in the Speaker Mic Plug (see diagrams). The upper part is assembled with the lower part by four M3x10 screws and nuts. Attention must be paid to the mobility of the Unlock.
Special pliers are required to crimp the wires at the RJ45 connector. Please do not use the plug at the transceiver without crimping or complete wiring with the Speaker Mic. This will inevitably result in damage to the FT-817! The electrical insulation of the contacts and components is a matter of course.
When assembling all parts together, please don't forget the "Unlock"! Otherwise the FT-817 Speaker Mic Plug is very difficult to get out of the socket from the transceiver.
vy 73 es 55 de DH1ND
Layer height 0,1mm / 2 Shells
To remove excess PLA, use a 5mm slotted screwdriver in the recesses on the outsides. Print the tiny "Unlock" twice and together with a bigger part or all parts of the Speaker Mic Plug at the same time.
UPDATE 26.01.2017: Description completed.