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http://www.electronicshub.org/

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https://en.wikipedia.org/w/index.php?title=LM317&action=edit&section=1https://en.wikipedia.org/wiki/Pinouthttps://en.wikipedia.org/wiki/LM317#cite_note-1https://en.wikipedia.org/w/index.php?title=LM317&action=edit&section=2https://en.wikipedia.org/wiki/Linear_regulatorhttps://en.wikipedia.org/wiki/DC_to_DC_converterhttps://en.wikipedia.org/wiki/DC_to_DC_converterhttps://en.wikipedia.org/wiki/Heat_sink

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https://en.wikipedia.org/wiki/Switching_voltage_regulatorhttps://en.wikipedia.org/wiki/Switching_voltage_regulatorhttps://en.wikipedia.org/wiki/TO-220https://en.wikipedia.org/w/index.php?title=LM317&action=edit&section=3https://en.wikipedia.org/wiki/Decoupling_capacitorhttps://en.wikipedia.org/wiki/Operational_amplifierhttps://en.wikipedia.org/wiki/Bandgap_voltage_referencehttps://en.wikipedia.org/wiki/Voltage_divider#Resistive_dividerhttps://en.wikipedia.org/wiki/Operational_amplifier_applications#Non-inverting_amplifier

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https://en.wikipedia.org/wiki/LM317#cite_note-2https://en.wikipedia.org/w/index.php?title=LM317&action=edit&section=4https://en.wikipedia.org/wiki/Constant_current_sourcehttps://en.wikipedia.org/wiki/Low-dropout_regulator#Ripple_rejectionhttps://en.wikipedia.org/wiki/LM317#cite_note-ti317-3

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http://www.engineersgarage.com/content/seven-segment-displayhttp://www.engineersgarage.com/content/ledhttp://www.engineersgarage.com/microcontroller/8051projects/create-custom-characters-LCD-AT89C51http://www.engineersgarage.com/microcontroller/8051projects/display-custom-animations-LCD-AT89C51http://www.engineersgarage.com/insight/how-lcd-works