Hi Karl, There is very little advantage in making double sided boards unless you can make them through-hole plated. It is impossible to get some devices properly connected to the runs under them. What is important about your information is the resolution achieved. With good resolution you can use the process perfected by the Japanese where you use a high resolution layout on one side and wire jumpers on the other. There are board fab houses that will make double sided through-hole plated boards in lots of 10 for under $5.00 each. Some have a tooling charge but many do not charge for the setup if your boards are a standard size. You can also save by laying out several circuits on one board and cutting them apart later yourself. The places to look at are the ones who offer prototype service. One place I talked to which was a production house wanted $500.00 tooling fee and $30.00 each for a minimum of 100 boards. This was their prototype rate. Where I worked, 10 boards was a production run !!! There are some that will take your information in the form of a "Gerber File". Most of the board design software programs provide this format. You can then send it to them by modem. There is one in Kentucky (I think) that does it that way and has a 5 day delivery. The design programs (Minimum versions) go for under $200.00 Some of the more professional ones offer a FREE trial cd that has a limitted number of holes. I am somewhat out of touch since retiring but have maintained a few sources for my future use. An internet search should provide plenty of possibilities. _______________________________ Al Allworth On the Beautiful Southern Oregon Coast ________________________________ ----- Original Message ----- From: "Karl Cunningham"
To: Sent: Saturday, June 10, 2000 8:54 AM Subject: Home Made PCBs > For those who want to put their favorite circuits on a PCB, see > http://www.clarc.org/Articles/laserpcb.html > > Using high-quality printer paper from an office supply superstore and > ferric chloride etchant from an electronics store, a friend of mine > recently made a double-sided board with traces on 0.025" centers. > > > Karl Cunningham > La Mesa, CA. > PSN Station #40 > karlc@....... > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>