alt.energy.homepower

"(PeteCresswell)" wrote in message news:ihems3dfa05hsuaqac8olt1kbfr8iog093@...
> Per Ulysses:
>>You could make a bridge rectifier with four very small diodes and use an
>>adjustable voltage regulator (LM317 Radio Shack). You would only need to
>>add a couple of capacitors and resistors, one being adjustable, and the
>>whole thing would be not much bigger than a book of matches. You could then
>>choose 3 volts or 6 volts (3 would be easier) as long as the bulb does not
>>use more than amps. If necessary you could use the bicycle for a heat
>>sink. The Radio Shack regulator has the circuit diagram on the back of the
>>blister pack.
>>
>
> I wimped on the bridge rectifier and ordered 3 from Radio Shack
> (figuring I'll toast at least one klutzing around... and at three
> bucks each, why not?)
>
> Looks like I'll be getting a voltage regulator too.
>
> Sounds obvious from the name, but just tb sure: this thing will
> lock the voltage at whatever I set it to, right? So the input
> voltage may vary from 3 to 20 volts, but the output will always
> be, say, 3.
>
> As far as using the bike frame for a heat sink goes, I'd expect
> to find some sort of heat-conductive putty and embed the two
> components in that and just stick it to someplace on the frame.
> Sound right?
>
> Where do the capacitors and resistors come in?
>
> Capacitors to even out the flow and/or store a little for a few
> seconds of light when the bike stops?
> --
> PeteCresswell

__________
________ | LM317 |
HUB------------------|AC +|------+-------|VIN Vout|----+------3V
| | | | | |
| | C | ADJ | R
| | 1 ---------- 1
| | | | |
HUB------------------|AC -|------+ +---------+
-------- | | |
| R C
| 2 2
| | |
\-------------+---------/
|
GND
C1 = 100Uf
C2 = 1uf Optional
R2 = 240
R1 = 180 (calc 173)

Vout =

Ref
/ds/LM/


Cheers