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I adapted this from a theory of the expanding universe. I used these equations to regulate the expansion of Farmer John hot dogs on a gas barbeque. In EE filters you will run into Chebyshev polynomials. It's just a math technique no deep meaning beyond the math.

I was a math major as an undergrad so this kind of exercise was routine and not really abstract at all. I was also an EE major years later and this problem came up in filter design so I got curious and tried the Bessel procedure from a first course in complex analysis and it worked with a little...

Yeah this type of problem is mathochistic. It's done the same way an explicit expression for Bessel functions is calculated by defining them in terms of the Laurent expansion of a generating function. The Bessel function's generating function has an exponential term that has to be expanded as a...

Have you used residues to calculate the Laurent expansion of the ordinary generating function for the Chebyshev polynomials of the first kind to find an explicit expression for the Chebyshev polynomials? I did it once and found one and it was correct in magnitude but the signs were wrong like a...

Has anyone used residues to calculate the Laurent expansion of the ordinary generating function for the Chebyshev polynomials of the first kind to find an explicit expression for the Chebyshev polynomials? I did it once and found one and it was correct in magnitude but the signs were wrong like...

Take this at least, this last advice, my son: Keep a stiff rein, and move but gently on: The coursers of themselves will run too fast, Your art must be to moderate their haste.

I've always been welcomed by benevolent non-sadistic intelligent spiral or helical vine creatures over which body is splattered when I smoke extract. I must be masochistic because every time I begin to merge with what seems to be a fun-house size collection of rooms full of intelligent vines I...

Thanks I have a few I'll try with the 2 10,000+ lm cobs soon I'm going to order soon .

Yeah no comparison, any good mid from deliveries or dispensaries is much stronger and can be a lot better tasting. It's just that I've never grown indoors with an intense source and a verified good genetic base and I was surprised the leaf from my young preflowering plants tastes good, not great...

This is off topic but since I started this thread....I got grief for stating hyperbolically in the newbie section that I preferred the leaf from BF critical kush 6 wk teens to some mid dispensary bud. The taste was vastly superior to a lot crap I've inadvertently been saddled with at...

Thanks I just ordered a variety of $5 converters to try with various power sources and loads.

I'll experiment with these circuits but I'm really not inclined to leave one powered when I leave the house. Considering safety, portability and resale value for permanent lighting I'll use properly engineered devices.

Sure but from what I gather (I'm completely new to lighting, my engineering degree is over 30 yrs. old and I was never an engineer) commercial led power supplies are superior to the type of system I'm looking at. I'm doing this because I'm interested in electronics again decades after serious study.

Thanks I'll connect my platinum 93% power supply to a quality converter with a load and do an automated test of the circuit. I'm curious about stability. The power supply is rock solid, a seasonic 1200W. If it's stable I might use it, I'm in no hurry to build a conventional light I do electrical...

I've used very small amounts because one of the benefits of salvia is empathy and it is activated even when I don't go beyond stage 1. If you smoke more than a micro dose get a good friend to sit for you. A sober sitter can prevent injuries if you get frightened (you will at some point) or go...

[ The 1200W 20A/60V DC High Current Programmable Digitally Controlled Power Supply TTL is capable of 1200W when both the current and the voltage are at their maximum. In general P=VI in a DC resistive circuit where P is power V is voltage and I is current. Maximum power is then 1200VA=60V*20A...

The 1200W 20A/60V DC High Current Programmable Digitally Controlled Power Supply TTL is capable of 1200W when both the current and the voltage are at their maximum. In general P=VI in a DC resistive circuit where P is power V is voltage and I is current. Maximum power is then 1200VA=60V*20A or...

There are some I've seen in the 600W range, but I've literally only been reading about led lighting for a few days. You could use 2 to power separate circuits. I just did a quick search, here's one for about $130 that matches 1200W with up to 60V out at proDCtoDC. I can't post links yet. 1200W...

[ You can use arbitrarily large power supplies, you just have to add the voltage and current controlling circuits built in to led drivers like Meanwell LDDs.

I'm thinking of getting Meanwell LDD and a few different ones like you suggested this morning to try. I have a roleadro 400W I'm converting to Citizen CLU048-1212 cobs, it's extremely easy just thermal adhesive or drill to mount and use 2 of 4 drivers available. For the more powerful setup I...