On Sat, 10 Dec 2011 22:02:01 Matt Beasant wrote:
Hi all,
Attention UK node owners or prospective node owners......
I have just purchased a bunch of CM108 USB fobs from Ebay and confirm that they work with ACID systems.
They have extra buttons on them ( vol up / down and mute ) so this MAY make it easier to wire out to the PTT and COS lines but I have yet to modify one so cannot confirm if this is the case.
COS is usually wired to one of the volume pins, so that should be no problem, but PTT is wired to a GPIO which usually has no other function. If the chip is epoxy-blobbed then there is no reason to bond out the GPIO pads on the chip. That particular housing is very easy to open using a fingernail. Just tease the two halves apart at the join. You will be able to easily see if the chip is packaged or epoxy-blobbed. 73, Andrew ZL3AME