[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

http://www.ebay.com/itm/Wholesale-USB-External-7-1-Channel-3D-Virtual-Audio-Sound-Card-Adapter-PC-Laptop/321869728763?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D37182%26meid%3Dc01ddad9c6324b2ab0a861086fa54171%26pid%3D100011%26rk%3D1%26rkt%3D3%26sd%3D291156304476
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