Message	Date	From	Subject
11199	2015-06-16 16:45:32	Thomas S. Knutsen	Reflow soldering QFN, was: Low IMD driver IC
Some solder paste, and a suitable (large) nozzle should work, there is a lot of ground, so some heat on the backside may help. A old cooking skillet should be quite decent to solder the parts, perhaps with some assistance from the hot air iron. If you have access to a reflow oven (can be built for $30 or so) that's even better. When it comes to solder paste, the most effective I have found so far is the $3 or so boxes marked Mechanic solder paste from china, sold on ebay. A stencil would be nice to apply the solder evenly. If you have access to one of the paper cutting machines, you can make some decent stencils. There are several videos on youtube that shows how to use stencils and paste. There are some SMD assembly tools avaible from china at a reasonable price that would do well in a experimenters workshop. The 858D hot air stations are ok at a reasonable price, and there are other tools that have more functions and accessories. Just make sure you check the grounding on the chinese equipment. 73 de Thomas LA3PNA. 2015-06-17 1:07 GMT+02:00 'Todd F. Carney / K7TFC' k7tfc@arrl.net [emrfd] <emrfd@yahoogroups.com>:
11200	2015-06-16 17:25:44	Todd F. Carney / ...	Re: Reflow soldering QFN, was: Low IMD driver IC

11201	2015-06-16 17:36:16	DuWayne Schmidlko...	Re: Reflow soldering QFN, was: Low IMD driver IC
The solder paste dries out over time and becomes nearly solid. It usually lasts longer if you put in a sealed baggie and put in the refrigerator. In many cases it can be restored. I have included a link to a video on how to rejuvenate old solder paste. https://www.youtube.com/watch?v=TCyki2frm3Q DuWayne KV4QB
11202	2015-06-16 18:05:29	Todd F. Carney / ...	Re: Reflow soldering QFN, was: Low IMD driver IC

Some solder paste, and a suitable (large) nozzle should work, there is a lot of ground, so some heat on the backside may help. A old cooking skillet should be quite decent to solder the parts, perhaps with some assistance from the hot air iron. If you have access to a reflow oven (can be built for $30 or so) that's even better.

When it comes to solder paste, the most effective I have found so far is the $3 or so boxes marked Mechanic solder paste from china, sold on ebay.

A stencil would be nice to apply the solder evenly. If you have access to one of the paper cutting machines, you can make some decent stencils. There are several videos on youtube that shows how to use stencils and paste.

There are some SMD assembly tools avaible from china at a reasonable price that would do well in a experimenters workshop. The 858D hot air stations are ok at a reasonable price, and there are other tools that have more functions and accessories. Just make sure you check the grounding on the chinese equipment.

73 de Thomas LA3PNA.

2015-06-17 1:07 GMT+02:00 'Todd F. Carney / K7TFC' k7tfc@arrl.net [emrfd] <emrfd@yahoogroups.com>: