The chronograph represents the device which is necessary to define periods. It becomes by means of comparison of initial and final marks of intervals which watch, with those marks of periods which are already known. The device is necessary for bigger objectivity of measurements. It is possible to get a chronograph, but time of the price of the good device exceed your opportunities. For this reason it is possible to try to make this cunning device independently.
Instruction
1. At certain knowledge of physics and skills of soldering and collecting chips and payments to make a chronograph in house conditions it is quite real. As details collect everything that you will find in the house: the broken details of devices, the failed devices. All this can be useful for creation of a chronograph.
2. For a start find a tube which can be put on a trunk. Length of a tube there have to be not less than 15 cm, and as much as possible it can reach 20 cm. Note 7 cm from one end of a tube to designate the site of a tube which will need to be put on a trunk. Then measure 10 cm and note a basic unit. In the place of a mark drill four openings which diameter has to be no more than 1 cm. Drill openings so that they turned out in couples which are located the friend opposite to the friend. When drilling be extremely exact, otherwise sensors will not be able just to see each other. Before starting drilling, surely several times check all measurements. In spite of the fact that the small inaccuracy will not lead to a serious error, it is better to avoid it.
3. You pass to work with electronics. Prepare a small strip of textolite which width has to be not less than 3 cm. Fasten a tube to this strip, and then collect sensors. For this purpose you need the working or broken mouse. After installation of sensors start the quartz generator. To be necessary for you the generator on the basis of a chip 176LA7 which frequency is not less than 1 MHz. Also you need the counter. Use three-digit. If there is an indicator from some old computer, attach also it. thus, at you two triggers will turn out what requires the special button for dumping of counters.
4. Adjust generator frequency, put on a trunk, dump counters and you can begin to use a chronometer.