NeezyDeezy said:
Can you post about how you made the DC-DC converter? Does it get hot?
Sure been meaning to do this for a while.
I found a perfect little DC-DC converter on eBay for cheap.
http://www.hitron-e.com/pdf/hdm/HDM30T-2003.pdf
IN: 18-72V
OUT: +3.3V/500mA, +6V/3000mA, +12V/1000mA
So I created a t-connector between the battery and controller, and power it up.
Then I have the 3.3V running a cheap LED red blinky light, removing the 2xAAA, and hardwiring it in.
Something like
this one:
Then for headlights I am using two of
these.
They happily accept the 6V. But if I did it again I would either go with lights without the different flash modes.
Like
this one. Or upgrade to something with a few more lumens and designed for a bike, so I don't have to hack as much. Something like
theseones.
Which you can get without the batteries from a couple of places, like
here.
Finally I have the swtich that both turns the CA backlight on/off, at the same time it turns the DC-DC converter on/off.
I ran the lights on the way in to work today, about a 30min ride, and had a temperature sensor sitting between the controller and the little plastic box the DC-Dc converter sits in (all inside the new battery enclosure), and it only registered 25 deg-C at the end of the ride, think it was about 17 deg-C ambient. So it didn't concern me enought to crack the little plastic box open and take a proper reading. But Mark_A_W has the same DC-DC converter running 4x R2's and he was concerned enough about heat to give it some proper ventilation. Not sure if he is running them off 6 or 12V though.
Hope this helps.
Adrian