Matching to the impedance of an alternator.

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

JT is a tit and his posts here are tat.

Equivalent? I'm discussing electronics and he's making goofy noises.

John

Lot of blather, from a guy who can't tell inductance from reactance.

John

I also ran the dynamo model into a _perfect_ auto-transformer, varying inductance all the way up to 100H, hunting for success. As I posted, the results look very much like a power-limited source.

'Tis a shame they built it that way to avoid any electronics.

Larkin will sink his own boat, I don't have to do it. He can keep lying, but I have the whole thread in time sequence. ...Jim Thompson

And can't read either!

He claims to be quoting me as saying the exact opposite of what I actually did say.

Bizarre.

I suggested the fixed-duty-cycle buck switcher current multiplier on the 9th. You did it, badly, on the 15th. That's a long time to design a bad switcher.

John

The excess inductance was a good idea when bicycle dynamos were invented, but I agree that it just gets in the way now. It would be nice to design a "proper" dynamo then have a small box of electronics that takes care of voltage regulation and power management. You could then have separate outputs for accessory power, lighting power and battery charging, each with their own power management algorithm.

the

And if I was also born in a leap year, I would be 11. That wouldn't necessarily give me license to act 11.

the

I'm not. ...Jim Thompson

Indeed! It would be so easy! ...Jim Thompson

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

No - more like 5.

For some people... I'm far enough away from electronics design (and more importantly, mass production electronics assembly) that my best bet is for one of you folks to design and market said device.

of

Debatable. Your taunting of Larkin has become tiresome to me and maybe others.

?-)

The electronics is easy, as I've already demonstrated. I pursued this thread because it intrigued me that maybe I could make a saleable product with very limited resources.

Circuits are easy. Mechanical production almost _requires_ China. So I'd be more apt to simply make an add-on to existing Sturmey-Archer units.

I'll ask around and see what the bicycle crowd would buy... we have a lot of folks right here in my neighborhood. Seems that Sturmey-Archer hubs are only 1.8W, but new Shimano hubs are 3W, and can be had for ~$100. Spin it up an actually measure it. Find a nice LT buck chip that will run faster than a 555, and away you go ;-) ...Jim Thompson

can't be constant power: peopole run two headights in series off them for twice the illumination.

hmm, series:

use a relay to put the battery in series with the lamp when there's enough speed (use a diode pump driven by the altenator to power the relay) short the bottom diode when there's enough charge.