Been busy with work so I haven't had much time to spend in the shop. The turn signal flasher circuit is almost finalized. Here's a shot of it on a breadboard:
http://img217.exs.cx/img217/3036/dscn0012r2zg.jpg
On the left side are the 7812 12V regulator, the 2 power MOSFETS (IRFZ34N) and at the very left side buried under the wiring is a 555 timer that generates the flasher signal. On the right are the 4 sets of turn signal LEDs. Each set has 5 Quickar amber Piranha LEDs wired in series. The front and rear pairs are wired in parallel and each side is controlled by a MOSFET. I included a hazard option where all 4 flash together. I gutted the Eurolight handlebar unit, which is made of nice tough plastic, and will use my own switches.
The daytime headlight I'm using
http://tinyurl.com/4caed is a sealed unit with a 1Watt LED and a series resistor inside and is designed to be powered by 4 AA cells. In fact it draws just under 300ma at 6V, so connecting it to the nominal 12V electrical system would require adding an external series dropping resistor and wasting that power. Instead I decided to use that excess voltage to power my Warp Drive™. My Warp Drive consists of 2 cyan Luxeon Emitter LEDs connected in series with the headlight. They will be installed inside a minibox mounted on the back of the seat, and will shine down on the back wheel and illuminate the road in that area. Should look awesome at night! Here's a shot of the 2 Emitters in series with the headlight on my bench:
http://img60.exs.cx:81/img60/7509/3s...mitters7yh.jpg
Those babies are really bright. The 3 LEDs in series supplied by a 7812 regulator (the black device with the metal tab on the breadboard) draw about 275ma. which is well below their 350ma. max rating. Here's a closeup of an Emitter:
http://img60.exs.cx/img60/3081/emittercloseup0dd.jpg
It's a little more than 1/4" dia. Did I mention it's bright? I'm still working out how to package all the electronics. There will be a plastic minibox attached to the back of the seat with a tail/stop light and rear turn signals attached, and the battery will be velcroed to the underside of the seat, but I might need a second minibox if there isn't enough room in the first.