Resistor voltage rating

Standards draw from practical experience, though often with a considerable time lag and not always with a uniform reasoned approach.

Depending upon the resources available (manhours, equipment and material) and the liability that you're prepared to assume, you can make the decision on whether to follow book values in any situation. You just have to make sure that your decision is appropriate to the circumstances.

You can stick any old thing together to demonstrate function to your own satisfaction. If You want it to work tomorrow or next week after some physical neglect and possible forgetfulness enter the picture, you've got to take some added precautions. If you expect another person to use it without untoward effects, the responsibility for assumed reliability and possible misapplication increases. Looking backwards to determine just what level of responsibility was assumed at a particular time of hardware development requires a paper trail that will not always be there. In that case, you might as well have stayed at home.......the 'book' values will outlast you.

RL

That's one possibility. Fact is, I mentioned element14 and RS as a part of my rant but I'm not particularly keen on buying from them except as a last resort. That's because their prices are

To be fair, element14 does have an outlet for those without a VAT registration. They use a site run by the publishers of an electronics magazine as a portal, but the prices are just as exorbitant as on their own site. Besides they offer only a limited range there and shipping is really slow.

Just testing 1 will give you a fair clue. Generating 750v is trivial, 240v mains, 2 diodes, 2 small caps. Since you have an R load you can just swap in series Rs to give various voltage steps.

Sure, but if it isn't here it isn't here.

NT

opportunity

NT