T&L Publications

Very nearly. The lamp dimmer isn't actually part of it, I just want it to play well. The resistor should be between the capacitor and the LEDs. The whole reason for the space constraints already imposed is that I have a few CFL bases and I'm likely to have more as they burn out over the next few yea...

Ok, i understand, but i dont see how you are going to control an inductor out of phase current with a triac. Perhaps you can explain this. If you supply a circuit i can look into this more completely too. The current being out of phase is the whole idea behind reactive ballast. As for the triac, it...

LEDs in parallel -...19 is a prime number.... Yes, thank you. I am aware of current hogging and thermal runaway in carelessly paralleled devices. I would probably split it 5*4 with a different ballast resistor on the short leg. If the tube was run from DC that would explain why it burned out... Act...

Hot dog! I got lots of bites on this one. OKay, I've looked at capacitive ballast and what I see is that the triac dimmer may kill the LEDs with the switching action being so sharp- high frequency=low impedance, so an inductor will be needed to protect it. It looks like the inductor will be unlikely...

Are you operating at AC line frequency?
If so, why?

Yes. Mental exercise, expanding my horizons, making a lamp that may be compatible with dimmers.

The maximum current, which I didn't mention earlier, is pretty low. Maybe 60mA.

I'm looking at a project that I'll end up winding my own inductor for. I have some information on air core inductors, but nothing on ferrites or iron. Does anyone know of an information resource on this? FWIW, I'm looking at making an inductive ballast for a string of LEDs, but space is limited and ...

Great guacamole, MrAl! You really have a passion for this stuff. You're right, nothing comes free. An issue more limiting than the resolution is that the ADC may not be available in every application. I did have a flash of inspiration though. Instead of resistor weighted switches in parallel, why no...

I dunno, blood cavitating in my veins knocking loose any cholesterol deposits to clog something, spontaneous clotting, embolisms, flesh festering as benign foreign particles (eg. pencil lead pieces from childhood foolishness) get scrubbed, same with any medical implant, cartilage loosened from bones...

Hmm. Let me rephrase what I said earlier. Good linearity isn't very useful if the values are all crowded at one end of the range and the rest is unused- especially if the ADC has no margin for error. Having all the meaningful values (eight of them including nothing pushed) use 0.0338 of the range me...

Bigglez PMed me with: What are you trying to do? Do you have a human-readable schematic? So I took a look at the image as displayed and found that it will not reconstitute. I don't know what the deal is with imageshack, but what I uploaded is definitely human-readable (over four inches on a twelve i...

I heard a story of a Russian submariner who tried to soak his aching feet in one. The pain was gone pretty fast because his bones were pulverized. I'll have to see if I can verify this.

It occured to me sometime yesterday after I mentioned using an R2R ladder that SPSTNO switches can't quite do the job, so I'm stuck with binary weighting. I'm not sure I follow the exact values you gave for the switches, I think I should aim for something that will put all the activity in the middle...

...an excellent and thoughtful response that the forum timed out on and lost...

Ya' know, the R2R will work for this too. The power budget will be higher because of the ADC alone, and the resistors will have to be lower value too. But spare myself the lookup table, and about the same space either way... Now the time of 32uS isn't an issue from the human standpoint, but a single...

Thanks for the feedback, MrAl. I actually tried to minimize the file size. I didn't think anyone had a screen smaller than mine (11 inches), sorry. It's kinda funny that you mention using an analog line. My first idea was to use one except that I saw how much of a headache it would to figure the res...