I havn't looked yet but I was planning on buying them from Elfa (.se). If I decide to use them that is. Patrik ----- Original Message -----=20 From: "David P. Harris" To: Sent: Wednesday, July 11, 2001 2:15 AM Subject: Re: [EE]: LED bicycle headlight > Can you tell me who sells teh super caps? > Thanks, David >=20 >=20 > Patrik Husfloen wrote: >=20 > > Well I am going to replace bulbs with LED that's already decided. > > I don't have the parts to just _do it_ though, I would need to = figure out what I need and order it. > > I checked white LEDs today, they are about $2-3 (USD) each. > > I figure using 3-4 would give enough light to be legal. > > I was thinking a supercap would be easier to use, I also read the = pulsing the light would be more efficient, in that case just a resistor = isn't going to do it.. > > > > About the dynamo, not sure really, it's one of those that "leans" on = the tire for rotation. > > I'm guessing that is friction, this hub thing, what is that? > > > > Any suggestions would be greatly appriciated, > > > > Patrik > > > > ----- Original Message ----- > > From: "Jinx" > > To: > > Sent: Tuesday, July 10, 2001 11:19 PM > > Subject: Re: [EE]: LED bicycle headlight > > > > > > Well currently I use a dynamo (this is a very old bike, 20-30 = years > > > > or so) and it has filametn bulbs front and rear, what I would = like is > > > > a constanst light output no matter how fast I bike, which is not = the > > > > case atm, and light when the bike isn't moving, in case you have > > > > to stop for traffic or something. One idea would be to have the > > > > light on for about a minute after the dynamo stops charging. > > > > > > > I was browsing maxim earlier for those battery ICs, found a few, > > > > most were programmable by an SMB bus, I'd rather keep this > > > > as simple as possible > > > > > > Patrik, the first decision you need to make is whether you stick > > > with filaments or change to LEDs. That will then help you decide > > > what back-up supply to use. If you stay with filaments, a supercap > > > won't do it (two bulbs could use 1500mA). Go to LEDs and you'll > > > find the current requirements drop dramatically to 20-30mA, which > > > could be supplied by a battery or supercap. I think this is really = a > > > case of putting aside a Saturday and as Nike would say, just do > > > it ;-) BTW, are you using a hub or friction dynamo ? > > > > > > -- > > > http://www.piclist.com hint: To leave the PICList > > > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > > > > > > > > -- > > http://www.piclist.com hint: To leave the PICList > > mailto:piclist-unsubscribe-request@mitvma.mit.edu >=20 > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu >=20 >=20 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu