AllStar Node CM108 sound fob modification (final drawing and procedure)

 

AllStar Node
CM108 sound fob modification

1. Use a heat gun to desolder the audio plugs. This will expose pins 1 to 12
2. Use a soldering iron to desolder C2, R6 and R7
3. Cut the tracks from pins 2 to 5, 7 to 8 and 8 to 11. Use a multimeter to verify that there is no continuity between them.
4. Add a 2N3904 transistor. Collector goes to pin 5, base to pin 8 and emitter to pin 9
5. Add a thin wire from pin 5 (it will activate PTT on the radio)
6. Add a 10KΩ resistor between pins 7 and 8
7. Add a 32 AWG ultra flexible wire between leg (a) on the chip and pin 7
8. Add a thin wire from pin 7 (it will go to the TX LED on the front panel)
9. Add a 32 AWG ultra flexible wire between leg (b) on the chip and the solder spot to the right on the space left by C2
10. Add a thin wire from pin 1 (it will go into the audio input on the radio)
11. Add a 10KΩ resistor between ping 2 and 3
12. Add a thin wire from pin 2 (this is the COS wire)
13. Add a 1KΩ resistor between pins 11 and 12
14. Add a 32 AWG wire from leg (c) on the chip