This is how it looks underside: http://picasaweb.google.com/funlw65/20100513#5535259872597475378
On Nov 2, 5:56 pm, mattschinkel <[email protected]> wrote: > The actual parts are cheaper in SMD as well. > > Matt. > > On Nov 2, 5:27 am, Oliver Seitz <[email protected]> wrote: > > > > SMD versions would be cheaper to manufacturer. > > > That's true. I've once asked my PCB assembling company, and they told me > > how PCBs are populated: > > > 1. solder paste is applied to the top side for SMDs using a stencil > > 2. top-side SMDs are placed in the paste > > 3. top-side SMDs are soldered (infrared, hot-air or the like) > > 4. bottom-side SMDs are glued in place without solder paste > > 5. the glue is dried. This takes its time and therefore costs money > > 6. top-side THTs are placed > > 7. top-side THTs and bottom-side SMDs are soldered (possibly selective, > > wave soldering or the like) > > 8. bottom-side THTs are placed and soldered by hand. That's expensive, of > > course. > > > So, cheapest is SMD with parts on one side only. Next is THT only. Then > > come mixed SMD and THT with all parts on one side. Then SMD on both sides > > plus THT on top side only. The most expensive are PCBs with SMD and THT, > > both on both sides. > > > I'm not sure where to put "SMDs on both sides, no THTs" as it could well be > > that no glue is necessary then. > > > All of this only applies to automatically populated PCBs in perhaps 100 > > pieces or more. For low quantities, THT might even be cheaper as no > > solder-paste stencil has to be made. > > > Greets, > > Kiste -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
