Standlight circuits


Posted on Feb 6, 2014

Didn`t measure my resisitors exactly and since they are +/-5% and Vref has a range of 1. 2 to 1. 3 volts you can easily end up over 6 volts. Here is a worst case example: The reason that I disagree with that statement is that they clearly work well in commercial headlights. The IQ Fly dims in standlight mode, but still puts out more light than the 30-50ma that works well for this circuit.


Standlight circuits
Click here to download the full size of the above Circuit.

The reason that I disagree with that statement is that they clearly work well in commercial headlights. The IQ Fly dims in standlight mode, but still puts out more light than the 30-50ma that works well for this circuit. I have a B&M d`Lumotec Oval N-plus, and I appreciate the quality of its standlight. I do think useful things can be done with supercaps. I`ve been told that the commercial standlight circuits are really complex, and presumably the designer felt that the performance improvement was worth accepting the additional complexity. Personally, if I were making a home-built standlight I would use something much simpler with a modest performance degradation. With that said, I now use a self-built LED dynamo light with no built-in standlight. A flashlight, which I require anyway for repairs in the dark, sits on my bars and performs the standlight function. As I`ve mentioned before, I think this is the simplest solution of all. As always, your mileage may vary. I finally got the breadboard from a friend tried out the most basic circuit, and found the results underwhelming. I`ll try out frontranger`s clamped circuit feeding off 7. 2v and report back. I`ll also try it with a second supercap in series instead of diode clamps and with the clamps but the 2nd supercap in parallel and see how it goes. edit: After talking it over with a friend, it seems that keeping the clamp but using the supercaps in parallel is the most...




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