From jwbruce at ece.msstate.edu Mon Mar 2 07:56:05 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Mon Mar 2 07:56:14 2009 Subject: [ece1002] soldering today Message-ID: <11301299.3951236002165388.JavaMail.root@zimbra.ece.msstate.edu> Remember that you thru-hole soldering projects are due today at 1PM. Also, bring your toolkits/irons to class today. You will also want to bring a pair of tweezers. The surface-mount devices (SMDs) are very small. There is no way to hold them by hand while soldering (unless your fingers are made of asbestos :-). If your eyes are bad, you will want to bring some type of magnification. These SMD parts are small. The surface-mount soldering kits cost $20. Meet in the Simrall auditorium at 1PM. We will go upstairs after a few comments and demonstrations. See you this afternoon. JWB ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 From jwbruce at ece.msstate.edu Mon Mar 2 12:54:29 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Mon Mar 2 12:54:39 2009 Subject: [ece1002] SMT soldering videos In-Reply-To: <29662775.5391236016189560.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <32234171.5661236020069207.JavaMail.root@zimbra.ece.msstate.edu> There is no better way to learn soldering than just get in there and burn your fingers. Soldering is a skill that you must practice. Here are a few videos from certified soldering instructors. Watch these videos a few times. Then, get in there and try to "melt some lead". SMT resistor (iron and solder) http://www.youtube.com/watch?v=_IqJdJEMUOE SOT23 (diode?) http://www.youtube.com/watch?v=iQujMK_rju0 QFP (pt-to-pt) http://www.youtube.com/watch?v=NALwJ6OnwNw Removing soldering bridges http://www.youtube.com/watch?v=eg2hxpy--gg SOIC SMD (hoof-tip drag method) DO NOT TRY THIS UNTIL YOU HAVE LOTS OF SMT EXPERIENCE AND THE RIGHT EQUIPMENT!!!!! http://www.youtube.com/watch?v=wQXhny3R7lk SMDs and their PCBs are very-heat intolerant. Surface-mount PCBs have very small "pads". They are very easy to pull up if you heat them too much. SMDs are very small and you can easily melt their internals if you hold the iron to them for any period of time. Take your time; be patient. These SMT boards are challenging. Good luck. JWB ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 From jwbruce at ece.msstate.edu Mon Mar 2 21:27:00 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Mon Mar 2 21:27:11 2009 Subject: [ece1002] Re: SMT soldering videos In-Reply-To: <2980000.7281236050697009.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <720742.7301236050820552.JavaMail.root@zimbra.ece.msstate.edu> ECE1002-ers: Now that you have tried a few SMT solder joints, I encourage you to go back and watch all of these videos again. You'll probably understand/appreciate them a bit more this time around. In fact, I'd watch them all again each time I started to solder SMT components for the next couple of weeks. We will collect your surface-mount PCBs for grading on Monday, March 23rd at 1PM. This mean that you only have until March 13th to get assistance from us. jwb ----- Original Message ----- From: "J. W. Bruce" To: "ece1002" Cc: "janem" , "J. W. Bruce" Sent: Monday, March 2, 2009 12:54:29 PM GMT -06:00 US/Canada Central Subject: SMT soldering videos There is no better way to learn soldering than just get in there and burn your fingers. Soldering is a skill that you must practice. Here are a few videos from certified soldering instructors. Watch these videos a few times. Then, get in there and try to "melt some lead". SMT resistor (iron and solder) http://www.youtube.com/watch?v=_IqJdJEMUOE SOT23 (diode?) http://www.youtube.com/watch?v=iQujMK_rju0 QFP (pt-to-pt) http://www.youtube.com/watch?v=NALwJ6OnwNw Removing soldering bridges http://www.youtube.com/watch?v=eg2hxpy--gg SOIC SMD (hoof-tip drag method) DO NOT TRY THIS UNTIL YOU HAVE LOTS OF SMT EXPERIENCE AND THE RIGHT EQUIPMENT!!!!! http://www.youtube.com/watch?v=wQXhny3R7lk SMDs and their PCBs are very-heat intolerant. Surface-mount PCBs have very small "pads". They are very easy to pull up if you heat them too much. SMDs are very small and you can easily melt their internals if you hold the iron to them for any period of time. Take your time; be patient. These SMT boards are challenging. Good luck. JWB ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 From jwbruce at ece.msstate.edu Tue Mar 3 07:55:36 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Tue Mar 3 07:55:48 2009 Subject: [ece1002] Replacement parts for SMT kit In-Reply-To: <5F2E7969-3DA9-4CEF-A7A1-D665CEC6C084@msstate.edu> Message-ID: <7509299.7661236088536923.JavaMail.root@zimbra.ece.msstate.edu> Ryan Nazaretian (rnn13) is ordering some replacement SMT parts for his solder kit. (I don't have a very big collection of spare parts in SMT yet!) Ryan is ordering from Mouser (www.mouser.com). If you would like some replacement parts, or a new soldering iron, or flux, or solder, or brass shavings, or a $5000 hot-air rework station, etc let Ryan know. If y'all share an order, you will save money on shipping and handling. In general, small quantities of parts cost almost nothing. The S&H runs $8 and up. Thus, it is best to order large quantities of parts or lots of stuff to get the S&H/unit down. Let Ryan know TODAY (Tuesday) because he wants to order this evening. JWB ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 ----- Original Message ----- From: "Ryan Nazaretian" To: "J. W. Bruce" Sent: Monday, March 2, 2009 11:27:32 PM GMT -06:00 US/Canada Central Subject: Replacement parts I decided I would just order some spare parts for this project from Mouser. I think it's like $2 in parts total. I was going to get 10 diodes (Part # 863-MMBD701LT1G) and a replacement piezo (Part # 665-AB2040B). I'm pretty sure the diode is the correct one, but I'm not sure how well the piezo element will work. I don't think there is anything special about them, but I have never used them in all my years of electrical work. I am also excited about getting my new soldering iron to replace my crappy Radio Shack one. I'm going to order the parts probably tomorrow and ship them via USPS. If you know of any students that need a replacement, I should have 9 extra if everything on my end goes well. Thanks, Ryan Nazaretian ( rnn13@msstate.edu ) From jwbruce at ece.msstate.edu Tue Mar 3 09:41:18 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Tue Mar 3 09:41:22 2009 Subject: [ece1002] SMT solder kit hints In-Reply-To: <11208427.7941236094726345.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <16356074.7961236094878111.JavaMail.root@zimbra.ece.msstate.edu> A few things to watch for when soldering your Ole Miss management majors laptop, a.k.a. the Elenco SM-200: * The two big electrolytic (can) capacitors are polarized. They have a distinctive plus and minus side. Take care when soldering them down. (The chip capacitors, the little tan ones with no markings, are not polarized. Their orientation does not matter.) * Do NOT solder down the dimple switch. Read the instructions. A piece of double sticky tape (the really flat one) holds it down. Make sure you put one of the "flat" sides of the dimple switch to the left/west. The nylon spacer is "stuck" to the sticky side of the tape on the top side. I had to trim my flat double-sided tape. It was so long, it would have covered the LED to the left of the dimple switch. * Take extra care to get your SOICs lined up with their solder pads. Tack down the pin #1 corner. Use your tweezers to get it aligned just right, then tack down the opposite corner. Then, and only then, go and use solder to connect all of the pins. * The piezoelectric buzzer (the quarter-sized brass and white thingamabob) is surprisingly difficult to solder. The brass substrate that is tacked to the board soaks up LOTS and LOTS of heat. The solder is difficult to flow onto it. Take care to be exact with your iron. If you mess around and heat it too long, you may melt the piezoelectric (the white) part. Also, take care when soldering the wire on the top of the buzzer. ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 From jwbruce at ece.msstate.edu Tue Mar 3 09:44:44 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Tue Mar 3 09:44:46 2009 Subject: [ece1002] SMT soldering kit mods In-Reply-To: <32865075.7921236094259256.JavaMail.root@zimbra.ece.msstate.edu> Message-ID: <29888229.7991236095084929.JavaMail.root@zimbra.ece.msstate.edu> Some of you asked about strain relief on the battery clip wire on the SMT decision-maker. The board did not provide one. Bad design IMHO. If you'd like to pimp or mod your board, you can add battery cable strain relief. Just to the left of the battery solder pads is an area of FR4 (the fiberglass PCB substrate) with no metal. No exposed pad or traces under the soldermask (the green plastic layer that protects the traces). Before you attach the battery leads, you could drill a small hole in the FR4 in this area. Then, you can pull your battery leads through the hole, tie a knot, solder it down, and tie a knot on the other side. Same technique as I demonstrated on the thru-hole board. Super strain relief would be to drill two holes and snake the leads thru, tying knots on the outside passages. enjoy. jwb PS: A poor man's strain relief is to wrap the battery leads around one of the foam tape blocks in a corner after your board is finished. ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 From jwbruce at ece.msstate.edu Thu Mar 12 09:46:00 2009 From: jwbruce at ece.msstate.edu (J. W. Bruce) Date: Thu Mar 12 09:46:04 2009 Subject: [ece1002] Fwd: Soldering Parts In-Reply-To: Message-ID: <20989366.33361236869160905.JavaMail.root@zimbra.ece.msstate.edu> >From your colleague rnn13: ------------------ J.W. Bruce, Ph.D., Associate Professor Department of Electrical and Computer Engineering Mississippi State University 406 Hardy Road, Simrall 335 Mississippi State, MS 39762-9571 Office: (662) 325-1530 FAX: (662) 325-2298 ----- Forwarded Message ----- From: "Ryan Nazaretian" To: "J. W. Bruce" Sent: Tuesday, March 10, 2009 3:09:17 PM GMT -06:00 US/Canada Central Subject: Soldering Parts The SM parts came in yesterday. Here is the price of each one individually. Diodes are $0.56 - 5 Available 0.015uF Capacitors are $0.52 - 5 Available Piezo Speakers are $1.30 - 5 Avalable The Piezo Speakers are a bit smaller than the ones that came in the kit. I'm not sure if they will reach both points, but I don't believe it will make a difference as far as them working or not if you only solder it to the right solder pad. From ece1002 at ece.msstate.edu Fri Mar 27 01:03:53 2009 From: ece1002 at ece.msstate.edu (1901-2009 Pfizer Inc.) Date: Fri Mar 27 13:04:01 2009 Subject: [ece1002] [SPAM]RE: UK Pharmacy Discount ID 6683 Message-ID: <20090327100353.6129.qmail@user-b2fce12359> An HTML attachment was scrubbed... URL: http://www.ece.msstate.edu/pipermail/ece1002/attachments/20090327/d4a3bc0e/attachment.html -------------- next part -------------- About this mailing: You are receiving this e-mail because you subscribed to MSN Featured Offers. Microsoft respects your privacy. 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