Hello all, I've been reading through the archives and have gotten some interesting information, but I'm still looking for more on buried resistors. I've seen a lot about the Ohmega-Ply mat'l, and our vendor will do it for us, but I'm concerned about the costs, especially since I need only about 1 dozen resistors. A lot of people have mentioned thick film technologies such as carbon. How have the experiences been with this as a resistor? What sort of tolerances can you hold, especially since it seems you have to screen them on? Are there other application methods or materials? Also, since we need our resistor on an internal layer, would we be able to laminate other layers on top of it without affecting its performance? If anyone has practical experience with this, I'd love to hear it. Also, as a short term prototype (rather than the buried resistors), I'd like to be able to have a multilayer circuit, but just leave a hole between the outer layer and layer 2. It seems like it wouldn't be very feasible to laminate it with a hole (although if it would, I'd certainly consider it if someone can tell me how), so I was thinking it might just be easiest to laser drill through the outer dielectric layer. Is it possible to burn away a quarter inch square area of dielectric and leave the circuitry untouched. How hard is this to do? Thanks for the help... Matt Matthew Sanders PWB Procurement Engineer, Trimble Navigation Limited [log in to unmask] Phone: (408) 481-7817 Fax: (408) 481-8590 ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################