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LED Headlight Design - 2x2
This is Stuart's take on how things should be. He thought a 2x2 stack of lights would be better than the spread out designs I'd been talking about.
This design didn't fly because I thought it would be too high and looking back on things, would have been very tricky to mount heat sinks too.
Although on the other hand, if you could find a nice square heat sink that the tubes could have been bolted directly too this would have been a good plan.
LED Headlight Design - 3+1
To overcome the difficulties in the first design (where the bracket holding the LED tubes is wider than the control box) this appeared.
Bolt LEDs to Berocca tubes (hence the green) and then into 20x20x1.5mm aluminium angle. The bottom part (with three tubes) is then fixed and hinged to the transparent box behind (83x54x30mm) which holds the control electronics.
The fourth and final LED is fixed atop the first bracket. Not sure I like this really as it's looking a bit vulnerable to impacts with tree branches.
LED Headlight Design - 4x1
This was the original idea - bolt the LEDs to Berocca tubes (hence the green) and then into 20x20x1.5mm aluminium angle. That's then fixed and hinged to the transparent box behind (83x54x30mm) which holds the control electronics.
Urban Polaris - 3/12/2006 - here it comes!
Bikes come to the streets, tracks, forests and parks of Canberra in Australia's biggest one day MTB navigation event. Its fun, it's different and it's a great way to plan a route around the nation's capital on two wheels.
Check it out at the Wild Horizons Urban Polaris home page
Interested? Post here. Looking for a partner? Post here. Well worth doing and a great intro to this type of event, loads of fun.
I can't see there is a team of teams entry category this year - but if there is make sure you put in NoBMob!
Beers @ End of Long Trail
One of the advantages of riding at night... no view to look at so might as well have a beer 
Figure out the direction yourself... Christine, Rob, Craig, Greg, Matt.
Novice
Hi, I am fairly new to MTB’ing; I’ve done the manly dam circuit twice and completed the red hill ride(so not a total novice but I certainly have a lot to learn).
I am very interested in a novice ride and was wondering if there is any coming up?
Tue 17th Oct - Terrey Hills Night Ride
Hey all,
By popular request (from Saturday, from the Fling trainees, from... well, that's it!) a Tuesday night ride has materialised:
When: 7:30pm 7:00pm. Updated
Where: Shops on Booralie Road (or the entrance atop the first climb if it rains loads).
What: Perimeter + Long (+ Duffys if I can talk you into it?) + detour to the Tavern if someone leads the way!
This is night - bring lights suitable for off road riding!
I won't be there if it's raining!
RSVP
Rob's Dimmer Control (proof of concept)
Here's most of the circuit prototype on a breadboard.
What is notably absent was the test of battery low voltage comparison, although the logic to 'blink' the main LEDs when given a low warning was tested.
The voltage test was meant to be the easy part but a slight miscalculation saw a bit of work with the de-soldering braid... doh!
Rob's Dimmer Control (schematic)
This is the second control circuit tried, and it actually works, so that's a plus 
Most of what you see here is for a nice low battery warning feature which will 'blink' the main lights about 4 times a minute when the battery is getting low. The plan was that there would be a complete cut-off a little later. Cunningly though, this complete cut-off caused a feedback effect and actually meant that the lights dim very nicely as the battery discharges.
If you're not interested in this warning the only stuff of interest should be the 270+500 trim and 470+1K trim resistance networks and switch between them. If you don't want dimming of course, forget that part.
