ok, I see,
I wonder if that zentrix or something in that direction offers samples =
:)
will have to look into that..
would be pretty cool to fit LEDs on the bike for light.
I guess I iwll add it to my giant TODO list..
right after building a new computer case :)

Cheers,
Patrik

----- Original Message -----=20
From: "Bob Ammerman" <RAMMERMAN@PRODIGY.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, July 09, 2001 6:13 PM
Subject: Re: [EE]: LED bicycle headlight


> The white LEDs have a rather high forward voltage (3.6V ?) so to drive =
them
> off one or two batteries you typically need some sort of DC-DC =
converter.
> Also by using current instead of voltage feedback, the converter can =
be
> quite efficient.
>=20
> Bob Ammerman
> RAm Systems
> (contract development of high performance, high function, low-level
> software)
>=20
> ----- Original Message -----
> From: "Patrik Husfloen" <u58611234@TELIA.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Monday, July 09, 2001 11:14 AM
> Subject: Re: [EE]: LED bicycle headlight
>=20
>=20
> It seems from the Bulb life thread that there are a lot of drivers ICs =
for
> white LEDs
> is that for any special reason? I mean your regular red LED never had =
a
> driver IC..
> are the white LEDs "special" in some way, or can I drive them with a =
series
> resistor
> like I do with all the other LEDs?
>=20
> I'm not sure how many LEDs one would need to give sufficient lite..I =
was
> thinking 4 maybe..and a couple of red ones for the tail light..
> you mentioned NiCd, I thought those could only be recharged when they =
were
> completly drained or you pretty much ruined them.
>=20
> I wasn't part of the Piclist at the time for thsoe free cells :/
>=20
> /Patrik
> ----- Original Message -----
> From: "Roman Black" <fastvid@EZY.NET.AU>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Sunday, July 08, 2001 6:42 AM
> Subject: Re: [EE]: LED bicycle headlight
>=20
>=20
> > Patrik Husfloen wrote:
> > >
> > > Neat, I was looking to do the same thing, though I have a
> dynamo/generator driving my bulbs.
> > > so I guess I'd need some rectifier circuit, using a backup cap to =
give
> som glow while stopped might be nice also.
> > > too bad I have no clue on electronics :)
> >
> >
> > Hi Patrik, what about a small NiCd or NiMH
> > battery pack (like the free ones someone gave
> > to piclisters before?) Small and lightweight.
> >
> > That gives continued glow when the bicycle is
> > stopped, steadier glow when moving and is a very
> > simple way of protecting the LED headlight from
> > overvoltage.
> >
> > You need the NiCd battery, LED and it's resistor,
> > and maybe a protect zener and on/off switch
> > would round it out nicely. Nothing too complicated
> > there.:o)
> > -Roman
> >
> > --
> > http://www.piclist.com hint: The PICList is archived three different
> > ways.  See http://www.piclist.com/#archives for details.
> >
> >
>=20
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
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>=20
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>=20
>=20

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