How Did We Find Out About Dinosaurs? by Isaac Asimov

By Isaac Asimov

Lines the historical past of the research of fossils and explains what this has enabled researchers to profit in regards to the dinosaurs.

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Repeat for the other pair of motor driver chips. 17{2 Power Jack. Install J1, DC power jack. When soldering, use ample amounts of solder so that solder completely lls mounting pads. 18{2 Phone Jack. Install J2, modular phone jack. 19{2 Piezo Beeper. Mount the piezo beeper so that it is centered on circular outline. Polarity does not matter. 20{2 Battery pack. Clip connector and about 1" of length o battery pack leads. From bottom of board, insert leads for battery pack. Note polarization: black lead goes in hole marked ( ), red lead in hole marked (+).

Use the red and black wire to make the two jumpers between the cells (color of these jumpers does not matter). Make sure to get polarities correct. 21 can be selected. The battery pack may be held in the desired con guration using a variety of materials, including rubber bands, cable ties, glue, and/or electrical tape. 6 The Infrared Transmitter The infrared (IR) transmitter board emits modulated infrared light that can be detected by the Sharp IR sensors (of type GP1U52). The board has infrared transmitting LEDs that are driven by an oscillator circuit (the 74HC390 chip) and a power op-amp (LM386) on the Microprocessor Board.

The careful designer will test mechanisms both from the Switch Board and from the Microprocessor Board before committing to them. 25 provides a reference to parts mounting on the Motor Switch Board. 1{2 Get Motor Switch Board, and determine which side is the component side. The component side is marked with the parts placement layout. 8. 25: Motor Switch Board Component Placement 2{2 Diodes. These diodes have black epoxy bodies. Polarity matters: Install the diodes with the banded end as marked on the circuit board.

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