Homebrew PCBs

On 14/02/2013 12:34, Rick Sparber wrote:
> I can drive past Circuit Specialists in Mesa, Arizona, almost every week.
> They sell chemicals and photosensitive boards. I doubt they have the lowest
> prices on the entire web but they are convenient and I pay no shipping.
> Yesterday I was looking at their selection of boards. They had 3" x 5"
> single sided boards for $6.64. That is 44.3 cents per square inch. But they
> also had 4.6" x 6.6" single sided boards for $4.49. That is 14.8 cents per
> square inch. The lower priced boards come from a variety of suppliers so I
> figure they are getting rid of old stock. They sure have a lot of them.

Photo-resist goes off after a few months, which could cause a problem 
with old stock.

Leon
-- 
Leon Heller
G1HSM