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Unformatted text preview: your TA that the circuit works accordingly. HOW TO CONNECT LEDs LEDs have polarity. The longer lead is connected to positive. You should also limit the amount of current flowing through the LED; in order to do that a resistor is connected in series with the LED. Use the following formula to find the value of the resistance: i V V R L S = V S : Power supply voltage (5 Volts) V L : LED Voltage (usually 2 Volts except for blue and white LEDs that use 4 Volts) i : Current (Usually 20 mA) CONNECTION DIAGRAMS 74LS04 NOT GATES 74LS08 AND GATES 74LS32 OR GATES 74LS86 EXOR GATES...
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This note was uploaded on 09/18/2011 for the course ME 140L taught by Professor Staff during the Fall '09 term at University of Texas at Austin.
- Fall '09