for the new lamp I wanted to use a linear voltage regulator, but a switching regulator (buck regulator). Decided I adjust for an LM2576. In this type, various output voltages adjustable and it needs no power needed for the heat sink. Furthermore, it can be without power with a small switch on and off. The electronics, I built a small round board to join me later to accommodate the optics, the LED and the heat sink in a round housing.
The search for a suitable case was difficult because I was looking for a suitable internal diameter and had to take on the heat dissipation of consideration. Finally I found a tube of the Sänitärtechnik that all requirements were. In a piece of 11cm long, I built one of the components of the new lamp on the front, I glued a piece of plastic on to protect the lens of the optics.
heated in the first test operation, the tube to about 45 degrees, for my first test ride was not felt due to a warming of the air stream.
With a handlebar mount from Sigma, the lamp is attached to the handlebars, the new battery (7.2 volt, 3700mA) remains attached to the top tube.
Here are some pictures from my first test drive.
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