HP Forum Archive 14

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HP41 MLDL2000: design is ready Message #1 Posted by Meindert Kuipers on 25 June 2004, 4:09 a.m. Yesterday evening I have been able to get the full MDLL2000 running. The last problem is now solved. For those interested, this had to do with the power level conversion (6V to 3.3V) in combination with a low power mode which caused the MLDL to become unstable under certain circumstances. This problem was much tougher than I anticipated as I was searching in a totally wrong direction. All is now working as expected and I can finish the PCB design (which is 90% ready). I should be able to order the first proto PCB's within a week or so. And Diego, congratulations with your NOVRAM module! Meindert

Re: HP41 MLDL2000: design is ready Message #2 Posted by Diego Diaz on 25 June 2004, 9:42 a.m., in response to message #1 by Meindert Kuipers Hi Meindert, ... and thanks so much, I'm also happy to see you're in the last steps of your MLDL2000 developement. Keep us informed of your progress and good luck with those PCB's (I know for sure they require much more effort than the one in my tiny NoVRAM... :-)) Best wishes from Spain. Diego.

Re: HP41 MLDL2000: design is ready Message #3 Posted by Don Leonard on 1 July 2004, 2:08 p.m., in response to message #1 by Meindert Kuipers As an experienced electronics hobbiest, I'm sure you are already aware of the serious risk in ordering the full production quantity of boards BEFORE assembling and exhaustively testing at least one set of PCB's. It is a tempting situation when the cost of a few sets of prototypes are faced. But, PLEASE do not succumb to the temptation. As a Lead Design engineer and Project Manager on contract with a commercial company, I was 'told' to bypass my usual caution of ordering PCB prototypes as the boards were relatively simple AND HAD BEEN CHECKED by two seperate layout teams. Needless to say, there was an error which was missed by me and both checking teams. Additional lost time and expense was incurred for board rework, and the boards looked like a rework instead of a finished, professional layout. I never allowed this to happen again. Don

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