[App_rpt-users] Hackable CM108 fob

DuaneVT . selkie2 at comcast.net
Sun Jul 3 21:51:22 EDT 2016

I have several of these fobs. CM108 and open to mods.

Looking at the board carefully, it looks like the mic tip and ring are
wired together and removing 0-Ohm chip resistor R6 opens the 4V mic Vbias
line from CM108 pin 25, leaving mic T+R pins connected to CM108 MICIN pin
27 through a chip cap. Mic T-R pads are on J3 on the red LED side of the
board if the jacks are removed.I just confirmed R6 does indeed remove the
4.5V mic bias.

Duane KA1LM

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