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Home made PCB?
On 30 Jun, 18:12, "numeric" wrote:
Hi, I would like to build a PCB board with fine pitch (LQFP32) and very small surface mount parts (1206 and smaller) parts. The board is a simple 24 bit A/D and D/A converter with a full speed (12 Mbs) USB2 interface; although I would prefer the USB2 high speed interface (480 Mbs). The temptation is too hard to resist using today's microprocessors such as SiLabs C8051F350 (basically an 8051 cpu). I know that a commercial 4 layer PCB with a solder mask would probably work for homebrew construction; but the board cost is high. So what is the chance of a double sided PCB without solder mask working with very small parts? The process I would use in either case would be: 1. Place solder paste on all pads. Typically, when heated the solder will vacate between pins and will suck up, like a magnet, under the SMD pin. 2. Place glue under parts that will possible move when the board is handled. 3. Heat the PCB in a toaster oven until soldered. Manually follow the heat up and cool down time curves for type of solder paste used. Comments/suggestions are appreciated. I don't have any problems making PCBs at home for 0.5 mm lead spacing QFPs, or soldering them. by hand (drag soldering). Leon |
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