On Monday, January 02, 2012 12:23:13 PM andy pugh did opine: > I have some surface-mount opto-sensors which have pads on the > underside, but no pins as such. > Can anyone suggest how to solder them to PCB pads? I currently have a > soldering iron, blowtorch, gas cooker and a hairdryer, though I am not > averse to buying other tools.
Those are generally set in place with some sort of a pick & place aid, then carefully reflow soldered. If properly placed in the paste solder, they will suck themselves into perfect alignment with the pads. Ed Nisely had an article in CC some time back where he used a toaster oven for that, IIRC. What surface mount stuff I have dealt with was the electrolytic caps, used by the 1000's, in dvc-pro broadcast vcr's. They were accessible to a tweezer type soldering iron that GC sold for about $40, using a 500 watt powerstat to control the temps, around 55 volts seemed to be about right. But those had teeny tabs sticking out on the sides that the tips of the tweezer could touch both of at the same time. It wasn't a job for anyone with the beginnings of parkinsons. :( Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Q: Why was Stonehenge abandoned? A: It wasn't IBM compatible. ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
