Path: utzoo!attcan!uunet!seismo!dimacs.rutgers.edu!mips!daver!bungi.com!news From: dlr@daver.bungi.com (Dave Rand) Newsgroups: comp.sys.nsc.32k Subject: Re: Gatewayed mail message Message-ID: Date: 12 Jul 90 16:34:09 GMT Sender: news@daver.bungi.com Lines: 41 Approved: news@daver.bungi.com [In the message entitled "Gatewayed mail message" on Jul 11, 9:32, Admin writes:] > questions > as I assemble my board. > > 1) The resistor Sips - normally orientation is important, but since each > sip has 4 identical resistors, does it matter? Should the dot on the > pak be oriented with the arrow on the board? Yes > > 2) The 20 and 50mhz crystals - Do they get soldered on the board, or > should there be sockets like the board mask shows? I would suggest sockets. They are not required, but would be really nice! > > 3) The 3 diodes, the arrow on the board, matches the black tail > end of each diode for direction? Board: ->|- Diode: -------[ |]-------- > > 4) The 4 leds, is the short leg the positive lead or the long one? No way to know for sure. Measure it... > > 5) These 50 odd same tantalum capacitors, no orientation right? > (A5E104M, top 931ZC bottom), yet why does George's diagram show > +v on left, vertical +v towards bottom? Wrong. Tantalums are (very) orientation sensitive. They will explode if connected wrong (although not instantly). The monolithic bypass caps, on the other hand, are not orientation sensitive. > > All help would be appreciated > Bob (heathkit) Von Borstel -- Dave Rand {pyramid|mips|sun|vsi1}!daver!dlr Internet: dlr@daver.bungi.com