Recent content by Porque223

Consumer use or commercial use? Although one guy I knew (now deceased) bought cheap stuff multiple times and it was still cheaper than buying commercial use stuff once.

Verily, Sires & Miladies, this is the thread that will not die! :(

It's much worse than that. I think you can connect dissimilar transformers in series or parallel for current sharing or voltage increasing with some cases requiring resistors to alter the current sharing. The two cases to be checked are full load and no load (if the application ever has the...

It'll cost ya'! :D

IIRC, red, green, and blue LEDs all have different design center voltage values. It used to be for a red indicating LED at 20 mA and a 5v supply you assumed a Vf of 2v and so it was a 150 ohm resistor and you lived with the brightness you got. By mistake I drove an LED with a TTL output...

If I could improve on this, I would. I can't.

Vs R LED v I 6 125 2.5 0.028 6 125 3.5 0.02 6 125 3.5 0.02 6 125 4 0.016 12 425 2.5 0.022 12 425 3.5 0.020 12 425 3.5 0.020 12 425 4 0.019 Assuming the only variable is LED voltage, if 16 to 28 mA gives an unacceptable variation in LED brightness, you could go to 12v if you have...

Wikipedia has a good article on antifreeze. Apparently even the car makers are not sure in some cases what not to use for long, trouble-free operation. The dye coloring is another issue.

[/url] Yes, the span tables incorporate deflection and strength of material for the joist and the joist strength depends on the material and shape. If you pick a table entry I guess some of us can say whether that choice will work, and why or why not.

I believe I've thought of that. If V1, Z1 and V2, Z2 are the voltages and winding impedances then paralleling them with no load would give an I of (V1-V2)/(Z1+Z2). If this I is less the winding current rating I'd say it's OK for one winding to sink or source this much current. And with a...

Formatting is bad, but, thanked percentages posts\/ thanked \/ percent 770 0 0.00 999 3 0.30 so out 999 posts there were 3 thanks for a percent of 0.3 264 4 1.52 26245 789 3.01 2463 339 13.76 623 19 3.05 2940 7 0.24 41416 1340 3.24 46241 2545 5.50 1836 237 12.91 708 5 0.71...

I'll post some examples.

The hour is late, but having fortified myself with milk, sugar and bread I now realize that your use of qualifiers is beginning to sound like this http://en.wikipedia.org/wiki/No_true_Scotsman fallacy. :D

This 150/92 ratio represents what more than half of their customers will go for, but your decision seems easy if you can find a drop-in replacement. Yeah, a growler. You might be able to sand down the commutator yourself and, depending on how many commutator strips there are, take many ohm...

Try it. Assume the LED voltages at 20 mA are approximated by 3.5, 3.5, 4 and 2.5v (the unspecified low end of LED voltages). With three LEDs this is 4x3 values. Then add voltage distribution, assume 12.8, 13.5, 14.4, 14.4, 15. Then add resistor tolerance, assume a normal distribution with...