> Yes it is a 4 layer board, but does not have any planes - I can look through > all 4 layers (behind a strong lamp) and I see the wires in the inner layers > too. I have connected my osci to that part and when I knock on it I get a > AC-voltage across the part. Looks like a shock sensor.
The fact that there are two of them at 90 degrees suggests some kind of shock sensor for X and Y (maybe an accelorometer?). As one is soldered upwards, that will be for the Z direction! They must be raw sesnors with small signal output if they're feeding into op amps. I guess they'll either vary resistance or capacitance being converted either to voltage or some kind of frequency. With that in mind you at least know what product types to look at... RP -- Author: Richard Purdie INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
