This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ------=_NextPart_000_0209_01C566CC.6305E760 Content-Type: TEXT/PLAIN; CHARSET=US-ASCII; format=flowed >>> Me too - it was just one of those serendipity things. I was channel >>> surfing and saw a few seconds of table tennis on ESPN and a light >>> bulb lit up >> >> Joe, how are you getting the ball bearing inside the ping pong ball? >> >> Inquiring minds.... > > Well, after I cut the ping pong ball in half it's a struggle but I manage > ;-) > > One thing I found - if you get the magnet pole exactly lined up with the > UGN3503 sweet spot, whoo smokey it's sensitive. +/- 50mV AC o/p > when the b-b wobbles barely 1mm, +200mV -400mV with a good > shove, using a TLC271 with gain of ~7. I think this really is a good > tremble switch. Magnet is a 5mm x 5mm x 1mm piece of strong stuff > from an HDD voice coil actuator (er, used !!). It's epoxied on edge, > which seems to concentrate the flux without excessively attracting the > b-b and stopping it wobbling Is the tremble switch good enough to sense cats jumping on the car, people bumping it in passing, and loud diesel engines, as is the norm in the industry ? ;-) Peter ------=_NextPart_000_0209_01C566CC.6305E760 Content-Type: IMAGE/GIF; NAME=proto_sm.gif Content-Transfer-Encoding: BASE64 Content-Description: Content-Disposition: ATTACHMENT; FILENAME=proto_sm.gif R0lGODlhZACeALMAADk0LnJcRpV1RZt6aaqWUrSfbLusisK3seTCgN/IpuLAy+rh3Pjj+f30+Pv/ 9////ywAAAAAZACeAEAE/vDJSau9OOvNu7eDkiCkURBFAKxs666OQZZFAiBFfhI8ryMBXAEnnBkT hY8HkCAICoKBQGBgqQLYbLZlAywkAIPKqi2zxNMpYBucEZQdwCHKG9gH4/FrpTdrrS16VlFSd09p UwQGb3AbYYQDBQZ2UVOFeFh3hYicaZhaaViITlIBnmVIjY4FdjtOTomwaTyetJ2WngKmYn8uV0wA rCg5i6oaYZHDJ5eUsbacdgQDsgLSdZrV1dKQm5W6eAOTxhkArTko0lI+r+g9JNnpmtE7TyTWPfh3 67ThKAPjGOQYuIXokiQEmgwYOMCwoQKGCiJKPPCQocIBCRb1YCVP0zBG/gArBDChQ5KnaSei1JCU 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