[Gta04-owner] Earspeaker, Vibramotor

[Flemming Richter Mikkelsen]

On Mar 3, 2013 2:36 PM, "Hermann Schwärzler" <hermann.schwaerzler at chello.at>
wrote:
>
> Hello Everybody!
>
> I am an owner of a gta04 (a4) but not of an GTA02 or similar so I am
> lacking some parts to have a fully working phone.
>
> Some days ago I found an old non-working Sony Ericson T230 while
> rummaging in the "potential toys" drawer of my kids. I disassembled it
> and found two parts that might work with my gta04:
>
> 1. An earspeaker labeled "LTR711B" (see attachment "ltr711b..."). It is
> rectangular in shape but seems to fit into the case (I am using a 3D
> printed one) if I take a sharp knife to square the circle that normally
> takes the earspeaker. I plan to solder/glue some kind of "adapter" to
> the speaker in order to put the contacts of the speaker to the right spot.
> But there are some questions I have w.r.t. this:
>  * Impedance: I measured 30 Ohms with my multimeter which is
>    promising, as it should be 32 Ohms, shouldn't it?
>    But do multimeters measure restistance using AC?

They normally use DC.
>  * If I put it into place it will cover two contact-points
>    (see attachment "covered_contacts"). These are labeled "RFID+" and
>    "RFID-" in the manual (last page).
>    Is this a problem? What are those used for?

I guess those pads are meant for near field communication (RFID) which is a
short range transiver.

I suggested to cover them and anything else in the area with tape to avoid
possible short circuits.
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