I used the method described by Björn Thomasson (http://www.thomassondesign.com/building/building_manual/preparations.aspx). At first I prepared my circular saw with a wider foot plate and a longer fence.
I thought it worked reasonable well but I payed not enough attention to the strip width. Now I have strips with varying strip thickness. I think the sawdust coming between board and fence caused the difference. I tried hard to keep the fence against the board but sometimes there was a little gap which i could not pull tight.
So now I have to use strips with different thickness and that will give a lot of extra work in sanding.
Next time I will make my strips on a table saw.