Re: [vcf-midatlantic] Schematic work needed
this is for a presentation slide, not to build the thing On Wed, Aug 29, 2018 at 11:05 AM RETRO Innovations via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
On 8/29/2018 9:49 AM, Kyle Owen via vcf-midatlantic wrote:
Why would ohming out this board not yield a 100% correct schematic? I see no tricky components that would confuse an ohmmeter except the address switch, which could be unsoldered.
Many of the signals go under the ICs. Sometimes, you can hold to a light and see through the PCB and validate where they go, but other times, I have missed wires connecting to more than 1 pin of the IC under the IC. Ohming, if applied verbosely for each signal around the IC compared to each IC pin, should find all of them, but I don't think I would promise 100% perfection without spinning a PCB and testing the completed unit.
Maybe everyone else is better at ohming out boards and the hidden signals under ICs never bother anyone else, but I've gotten hit twice by them on two different efforts.
Jim
On 8/29/2018 10:07 AM, Bill Degnan via vcf-midatlantic wrote:
this is for a presentation slide, not to build the thing
And, if that's the goal, then I don't see why 100% perfection is needed, and thus I agree the effort is much more manageable. However, I will again note, that's not what the original request stated. In fact, I would agree with you that simply a block diagram should suffice for such a slide. Jim
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RETRO Innovations