T&L Publications

I guess you never looked at an LED spec sheet either! LED Reverse voltage 5V PERIOD! LED "bulbs" would have a diode and current limiting (probably not resistor) built in. Dacflyer is not looking for a single blue LED "bulb" at 120VAC. According to link he wants equivelent light to 10W incandescent i...

Additional- A resistor's power rating is based on it's max power in free air which is at 25°C. Your calculation for 5mA was still 0.6W. Inside the base and bulb is not free air, it is not 25°C, and the resistor is not alone. So with thermal conductive epoxy (to move heat to metal shell) it might get...

You did not look at the page at the link Dacflyer gave. The calculations were for a bulb like that, not a single indicator LED. An LED is a diode, but the PIV is like 5V. For use in a 120VAC circuit another diode (or bridge) with a PIV of at least 200V is needed. With all components in the bulb, The...

I never said your dual contact socket had power on the shell. I was answering Externet who said a bayonet would expose 120VAC. Even if shell were used, properly connected it would be safe. Repeat, I DID NOT (NOT) say your setup used the shell for power. From the page you linked, it seems it contains...

A dropping resistor for 120VAC would be a huge beast. A dropping capacitor wastes a LOT less power.

And because it is for AC a rectifier is also needed.

Cheers,

Dacflyer, Then how would the shell get 120VAC on it like Externet suggested. In vehicles dual contact bulbs are sometimes used for brake and turn signal. The bulbs have two elements, one contact to each ans the shell is common return. So not using shell at all for electrical contact doubles the no p...

I believe they are not made/marketed because when inserting/replacing such bayonet bulb, the outer case terminal is exposing 120VAC to fingers.

???Neutral to shell, switched hot to contact.

... makes them look very faded. Because they are! A white "LED" is really a blue LED with fluorescent elements. Some blue light causes some green fluorescence. Some blue light causes some red fluorescence. Some blue light leaks out. The combination makes white. A blue filter absorbs 2/3s of the lig...

2nd is SPAM
1st just a waste of space

Copper is also more expensive.

People that don't know/care about a fairly small difference in performance and appearance go for the cheaper. so that is what mostly made. Others buy more expensive thinds for long term cost efficiency or "status".

Like I said before for the power filter capacitor, doing the math will pick the components.

See if you can find a copy of Fundamentals of Electronic Devices by Ronald J. Tocci.

I am not reference material for a paper.

Turn cell phone off in class.

Cheers,

not sure what the advantage is.

copper is a better heat conductor

((even the spammers were encrypted while created user accounts , (different protection called for)))

What is your major?

Oh yeah! How waterproof? Rain/spit/sweat? Or, submerged? (and depth?)