Portable personal computer (laptop) is a universal thing, it can to use as video player for watching movies DVD and other formats audio player, and even TV if you connect together with a light attachment USB-TV", and now in every way advertise mobile Internet. All is good - take it to the country, the nature, and enjoy life without inconvenience. But the battery capacity with hardly enough for a few hours, and where to get the power source if you are "in isolation from the mains is of course the battery of your vehicle, be it a car or a boat. Here's the problem-only the voltage of the car battery 12 In, and the laptop eats 18 V.
The figure shows a diagram for lifting automotive 12 V to notbecause 18, and collected "from what it was."
Generates a pulse diagram for the timer CREW. They arrive at the shutter powerful key to VT1. On the inductance L1, which is rectified by diode VD1. This voltage charges the capacitor C4. When the voltage across it reaches and exceeds 18 In the Zener diode VD3 opens and opens the transistor VT2, and it bypasses the valve VT1, closing it.
L1 is wound on a core network of the throttle. DPPC from an old TV set. Contains 100 turns of wire wound Sew 0,43, folded in half (to make it 0,86, but it is easier to wound).
All collected "hedgehog" in the building and on the Board from faulty switch carburetor "Volga" with an inductive sensor. The housing serves as a radiator VT1.
Author: V. We Can Say