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Curt,
I'm so sorry! Damn, $40. I also do the opposite corner trick for IC's, works like a charm. But what I always do, install the minimal number of parts for power, ie, no IC's, displays, etc, then I power on the board and check for power at all sockets on the right pins. I remember getting this advice from the construction article of my first microcomputer, the COSMAC ELF. A short somewhere might put unregulated voltage on the chips. Checking all IC's for proper power takes a minute and saves a lot of headaches in trouble shooting. I do this especially for all new designs. Thanks for sharing your lessons! Cheers, Josh Date: Mon, 9 Jun 2014 02:12:17 -0700 From: cu...@zen-room.org To: n8vem...@googlegroups.com Subject: [N8VEM-S100:4053] lessons learned building an SMB board set 1) don't plug in til311's upside down. it destroys them. there's a 40 dollar error.
2) momentary switches come in at least two flavors: normally open and normally closed. using the wrong kind (momemtary open) on your reset and slave clear switches keeps your machine in reset. 3) check your caps before you put them in. i ended up desoldering two of them. 4) for a timer, if you don't have the right value cap, use what you got and scale the resistor accordingly to give the same product. 5) the 555's don't have numbers on the silk screen, so you need to follow traces from known resistor names. 6) there aint nothing like an oscilloscope to debug timers. 7) solder 2 opposite corners of each socket, and then, while pushing on the socket, reheat the pins. 'Click' means that there was daylight under the socket. 7) reheat all your solder joints after putting them all in; makes those monster ground connections a bit less ugly, all in all, pretty smooth. --curt -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. |