This is a multi-part message in MIME format. ------_=_NextPart_001_01C68105.B3CFB76C Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Yea we were looking into mercury wetted ones but getting them as soon as = we needed them was going to be tricky. We have since adjusted the = circuit to switch it in a different manner. Perhaps i should look into = the downsides of components before using them next time ;). Thanks to = you all for your help. Steve -----Original Message----- From: piclist-bounces@mit.edu on behalf of David VanHorn Sent: Fri 5/26/2006 8:32 PM To: Microcontroller discussion list - Public. Subject: Re: [EE] Reed relay sticking =20 On 5/26/06, Peter wrote: > > > On Fri, 26 May 2006, Geo wrote: > > The capacitance of a few meters of cable under voltage carries enough > microjoules to weld a reed relay. The real real fix is to add small > resistors in series with the reeds directly at the reeds, and use gas > filled reeds (not vacuum ones). Think about it, there used to be phone > exchanges with millions of these in them. Yup, mercury wetted ones work nicely too, but I suspect they are = becoming hard to find. Hard to weld mercury. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ------_=_NextPart_001_01C68105.B3CFB76C Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+Ig4UAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEAHQAAAFJFOiBbRUVdIFJlZWQgcmVs YXkgc3RpY2tpbmcAjAkBBYADAA4AAADWBwUAGgAVAC4ANgAFAHoBASCAAwAOAAAA1gcFABoAFQAw AAsABQBRAQEJgAEAIQAAAEFFQUJDNTUwNjAyNDc3NDg5RDcwQ0NGQkY2NjBERTBCAFsHAQOQBgB0 CwAAOQAAAAMAJgAAAAAAAwA2AAAAAABAADkAvFFuhQWBxgEeAD0AAQAAAAUAAABSRTogAAAAAAIB RwABAAAAKQAAAGM9R0I7YT0gO3A9UFNMO2w9VFJPWS0wNjA1MjYyMDQ4MTFaLTIzNzEAAAAAHgBJ AAEAAAAdAAAAUmU6IFtFRV0gUmVlZCByZWxheSBzdGlja2luZwAAAABAAE4AgBnPKvuAxgEeAFoA AQAAABgAAABwaWNsaXN0LWJvdW5jZXNAbWl0LmVkdQACAVsAAQAAAE0AAAAAAAAAgSsfpL6jEBmd bgDdAQ9UAgAAAABwaWNsaXN0LWJvdW5jZXNAbWl0LmVkdQBTTVRQAHBpY2xpc3QtYm91bmNlc0Bt aXQuZWR1AAAAAAIBXAABAAAAHQAAAFNNVFA6UElDTElTVC1CT1VOQ0VTQE1JVC5FRFUAAAAAHgBd AAEAAAAOAAAARGF2aWQgVmFuSG9ybgAAAAIBXgABAAAAQgAAAAAAAACBKx+kvqMQGZ1uAN0BD1QC AAAAAERhdmlkIFZhbkhvcm4AU01UUABkdmFuaG9ybkBtaWNyb2JyaXguY29tAAAAAgFfAAEAAAAc AAAAU01UUDpEVkFOSE9STkBNSUNST0JSSVguQ09NAB4AZgABAAAABQAAAFNNVFAAAAAAHgBnAAEA AAAYAAAAcGljbGlzdC1ib3VuY2VzQG1pdC5lZHUAHgBoAAEAAAAFAAAAU01UUAAAAAAeAGkAAQAA ABcAAABkdmFuaG9ybkBtaWNyb2JyaXguY29tAAAeAHAAAQAAABkAAABbRUVdIFJlZWQgcmVsYXkg c3RpY2tpbmcAAAAAAgFxAAEAAAAbAAAAAcaA/JDB3zOvtqjBQeyud4bsd/EQrgACPSuLAB4AdAAB AAAAKgAAAE1pY3JvY29udHJvbGxlciBkaXNjdXNzaW9uIGxpc3QgLSBQdWJsaWMuAAAAHgAaDAEA AAANAAAAU3RldmVuIEhvd2VzAAAAAB4AHQ4BAAAAGQAAAFtFRV0gUmVlZCByZWxheSBzdGlja2lu ZwAAAAACAQkQAQAAAGIEAABeBAAANgYAAExaRnVWETGwAwAKAHJjcGcxMjXiMgNDdGV4BUEBAwH3 /wqAAqQD5AcTAoAP8wBQBFY/CFUHshElDlEDAQIAY2jhCsBzZXQyBgAGwxEl9jMERhO3MBIsETMI 7wn3tjsYHw4wNREiDGBjAFDzCwkBZDM2FlALpgrjCoDAWWVhIHdlHYEYIJIgF7BvawuAZyALgEh0 byAHgHJjCHB5Nx2BAkAJgCACIAeRYnUNBUBnH3EeUnRoZW30IGEEIHMeIAOgITEdkS8f4AmAH6Eg 43chMWdvKyCjHsBiHaB0BRBja7B5LiBXHaAT4HYdoAkAkG5jHaBhZGp1RnMfkiDhIGNpHwFp9wVA HrED4XQT0B6ABUALgOkhICBkBpBmHdECMB7QawBwH+ByJDBQBJAT4HDVBCBpIVBoCGBsH7AeEuMe hCXCZG93AIEBAAQg7G9mJfADcHAf0QIwIAH/ARAFsB2gJWAgpx/gDtEgkFEHgCA7KSQwVBPgbrZr BCAesXkIYCEgbAMgjyxRLsIFwCDwbHAuHPRdHPRTDrAkoDA6LTICTz0FEGcLgAdABdAHkHNhFyBg MgMc9EYDYTogcKUN4GwEAHQtBuB1JPHoc0BtJlAuCYAu8CGB2yOgE+BsK2ArUUQkkCsA9CBWAHBI BbALkDCkKAGHNEA0AClANS8yNjiQgDAwNiA4OjMUQKRQTRz0VG80QE0N4P8DYAWgAjADYC8gEoEn oATwTyVgAJAhgTSSIC0osHXXAmAN4DAlUzxgagWQOBGEUmU0QFtFRV09of8foRggC2AfQCVwI/Ee URz03RzlTwOgOIM48CwosQ6w5QXAPAtQcEAA0CbgA3DqLgWgLgMQPh2AA2AOsOo6HPQ+QvwgQEE4 QUDgnzigBdA+wTjSQOBHZR7A/0KfRBIuMCXhKQAA0CZQAHD/JQErUR1wJ9AH4AeAQSErNJcBoDrw LJBuBIEgdgbw9wGQIGBHYXIIgQQgCfAIYNxnaEPWNWA6UWopgQeR/x6xHZApoR1wCdE+dS4SHaDH GCAysU5jZml4HoAug/slMB+wcwDALyBD1hggAJD/JXAFsCkhA6AUEErTJsEnAL8lwk1iBCAnoBgg PXBsH0D+YSZhUlZA4ABwH7AlYB2gfmchMEPWTwA64T5yUqIoy0swBUB2ANB1dSEQH9K/LgMLgCoA AaAIYCcxdEDg7yDhLHMiUiODcClwH+BD1v8OwBPRHmBRxjVgLyA7oSszPyDhVKEnUSDiMCsc9XVw /0DgHu9RwgWwKgADACUAU0FtHrBvQOAgIkkhUCVgcP89YSDSU1Ed4SOgK4E/RxPh71kTTwBJ0DAl SGMVTPNeZRcwJTIAHOVoAkBwOi90L3dm4C40ZUIRIRBQIElDL1NYODBBUVwgJjvUCsAT0GkxJlb5 CJB3L1qEL4QHgAbQSPH9V5BwH8AFMFuTU3BmGwDA2wMQA4EuNWVs9i80kguALQIQLzRlMDp9cFAA AB4ANRABAAAALgAAADxCMDM5REFEOTAwMkQ5RDQxODlFNjAyMDAxMDNDQjE4QzAzRjc5RUB0ZXN0 PgAAAB4AORABAAAAfwAAADw0NDc3MzRBMS4xMzAwMi41QzZCMEVAbG9jYWxob3N0PiA8cmt4Zy5l YWViZi52dHN1QHJhYS5haS52anl5aj4gPDI1YjE3ODc0MDYwNTI2MTIzMnIzYzhmMTllZW0zODYy M2UyMTliMGY0ODczQG1haWwuZ21haWwuY29tPgAAHgBHEAEAAAAPAAAAbWVzc2FnZS9yZmM4MjIA AAsA8hABAAAAHwDzEAEAAABGAAAAUgBFACUAMwBBACAAWwBFAEUAXQAgAFIAZQBlAGQAIAByAGUA bABhAHkAIABzAHQAaQBjAGsAaQBuAGcALgBFAE0ATAAAAAAACwD2EAAAAABAAAcwvFFuhQWBxgFA AAgwlAXeswWBxgEDAN4/r28AAAMA8T8JBAAAHgD4PwEAAAANAAAAU3RldmVuIEhvd2VzAAAAAAIB +T8BAAAAWAAAAAAAAADcp0DIwEIQGrS5CAArL+GCAQAAAAAAAAAvTz1QU0wvT1U9RklSU1QgQURN SU5JU1RSQVRJVkUgR1JPVVAvQ049UkVDSVBJRU5UUy9DTj1TVEVWRQAeAPo/AQAAABUAAABTeXN0 ZW0gQWRtaW5pc3RyYXRvcgAAAAACAfs/AQAAAB4AAAAAAAAA3KdAyMBCEBq0uQgAKy/hggEAAAAA AAAALgAAAAMA/T/kBAAAAwAZQAAAAAADABpAAAAAAAMAHUAAAAAAAwAeQAAAAAAeADBAAQAAAAYA AABTVEVWRQAAAB4AMUABAAAABgAAAFNURVZFAAAAHgAyQAEAAAAYAAAAcGljbGlzdC1ib3VuY2Vz QG1pdC5lZHUAHgAzQAEAAAAXAAAAZHZhbmhvcm5AbWljcm9icml4LmNvbQAAHgA4QAEAAAAGAAAA U1RFVkUAAAAeADlAAQAAAAIAAAAuAAAAAwB2QP////8LACkAAAAAAAsAIwAAAAAAAwAGEIAzup0D AAcQrwMAAAMAEBAAAAAAAwAREAAAAAAeAAgQAQAAAGUAAABZRUFXRVdFUkVMT09LSU5HSU5UT01F UkNVUllXRVRURURPTkVTQlVUR0VUVElOR1RIRU1BU1NPT05BU1dFTkVFREVEVEhFTVdBU0dPSU5H VE9CRVRSSUNLWVdFSEFWRVNJTkNFAAAAAAIBfwABAAAALgAAADxCMDM5REFEOTAwMkQ5RDQxODlF NjAyMDAxMDNDQjE4QzAzRjc5RUB0ZXN0PgAAANsA ------_=_NextPart_001_01C68105.B3CFB76C Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ------_=_NextPart_001_01C68105.B3CFB76C--