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Measuring RPM via Photo reflector
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Install the capacitors from the photodiodes cathode leads to the ground loop you make in the first step. The completed brain. The 2.2K ohm resistors are installed from the Base of the 3906 to the Collector of the 3904 on both sides. Leave a length of lead on the side of the resistors that connects to the Collector (3904) to hook to your motors. These 2.2K resistors are for tuning the solar engines to perform it's best with your particular motors. Experiment for best results. Check for visible shorts and bad solder connections. You may want to clean off all the flux too. For those of you that couldn't wait...here's the final steps. Solder the capacitors positive lead to the solarcells positive lead then solder the capacitors negative lead to the solarcells negative lead. A capacitors negative lead is labeled on the can with a minus sign and arrows to the negative lead. Now solder the positive connection to the red "positive" lead and the negative connection to the white "ground" lead (ground loop). Now, choose with motor is going to be on the right (iny, miny, miney, moe works well for me) and figure out the lead polarity. Red is positive and the dark color or white is usually negative. The right motors positive wire goes to the photovores red "positive" lead and the negative motor wire is soldered to the green "left" lead (confused yet?). The left motor is installed the same but flipped. The left motors positive wire goes to the blue "right" lead and the negative wire is connected to the red "positive" lead. Put the photovore under the closest desk lamp and it should take it's first steps. Photovores are rather slow and boring by themselves but if you build 3 or more, you'll be quite surprised by the little quarks and attitudes of each one.
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