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View Full Version : Mischief with a Nightrider Digital Smart Lighthead <Cross post from Commuting>


Sirrus Rider
05-26-08, 12:41 AM
I have a hardly used (Maybe 20 times at most) Niterider Digital Smart light head (15W) from around 1998 that I want to put back into service; however, I don't want to have to bow down to Niterider and buy the Pop-plug to Surlock adapter and a new Digital Battery. What I am wondering (and I'm certainly not an electronics whiz) is the a way to graft this light head and build an acceptable voltage regulator to cut 12V in half to run it with 7ah SLA motorcycle battery?



http://i137.photobucket.com/albums/q219/Sirrus-Rider/Old%20Niterider%20head/smarthead002.jpg

It's a bit of a shame to relegate this head to the rubbish bin just because the maker went more proprietary with their connectors (and batteries!). I figure that POP plugs are readily available from Radio Crack (Shack) and other E-parts wholesalers that of all the Niterider light heads this one should be the easiest to hack provided that one has the electronics background.

I do have the Pop to Surlock adapter (It's in the pic) but it's garbage as the center pin pulls out and the connection is anything but certain.

I am aware that using a non smart battery might nullify the nifty "Fuel Tank" light, but run time would be a moot point with 7ish Amp hours to play with on a short distance vehicle.


My plan is to use a handlebar bag to mount the battery to the front side of my trike's basket just under the seat.

http://i137.photobucket.com/albums/q219/Sirrus-Rider/07%20Bikes/07SchwinnTownCountry.jpg

Sirrus Rider
05-27-08, 11:43 PM
Anybody??? Is everyone to afraid to piss off the Niterider godz???:lol:

dayve
05-28-08, 09:28 AM
I'll give it a shot. I think the efficient way to do it would be to come up with a PWM voltage converter. You may have to build it yourself, but it doesn't look too terribly complicated. If you get fancy about it, you can give yourself a switch or dial to adjust the pulse width. This would allow you to over/under-volt your lamp as you desired.

Examples:
http://www.dprg.org/tutorials/2005-11a/index.html
http://www.cpemma.co.uk/555pwm.html

You may have to be careful how much you drain your battery, though. You could conceivably run it REALLY low without noticing much/any change in light performance. Lead-acid batteries don't like that.