re why circuit boards are green in article apr news cs tut fi kuusama kaarne cs tut fi kuusama juha vtt writes not that the question is anything important but i am still curious why is that almost all printed circuit boards are green i have seen a few blue ones but no red yellow company logo etc is there a technical reason or could it be that the marketing geniuses have not tought about it yet juha the color of the board shows the composition of it hence the use of it original and older boards were bakelite composition and were brown phenolic spelling was a tan most non filled fiberglass boards used in computers are green filled fiberglass is blue teflon is white as boards evolved more and more demands were made of them first boards were used mainly in audio circuitry couldn t be used in high voltage or rf because it would arc and burn most boards today are fiberglass the type being chosen by its use and cost boards in satellite and microwave communication are teflon and ceramic as the fiberglass and other boards are conductive they actually work more as a capacitive dialectric but the word conductive simplifies explaination at the high frequencies another printed circuit material used mainly in automotive and interconnections is a thin flexible mostly mylar material and is used to connect the front of the vehicle etc to the back instead of wiring harnesses camcorders use this to intereconnect the boards inside where wires would be a nuisance am working on a generator made by hewlet packard right now and the entire board is gold plated boy it looks expensive hope i got most of my facts right as i am working from memory of material read my education was pre transister tom tom wagner audio visual technician malaspina college nanaimo british columbia loc fax callsign ve gda weapon kentucky rifle snail mail to site q c rr nanaimo british columbia canada v r x i do not recyle i keep everything all standard disclaimers apply
