On 06/27/2012 03:37 AM, lynchaj wrote:
I would still like to avoid an overdependence on SMT components because it limits the numbers of hobbyists who can participate. The SMT 68360 Quad Flat Pack (QFP) uses 240 x 0.25MM pins on 0.5MM centers. I don't know what the hobbyist failure rate would be trying to do flow soldering. PGA uses 100 mil pin spacing, well within the capabilities of hobbyists. A 4-layer board is probably a necessity. --John |