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Download Building a 5 volt power supply
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Transcript
Building a 5 volt power supply Most digital logic circuits and processors need a 5 volt power supply. To use these parts we need to build a regulated 5 volt source. Usually you start with an unregulated power supply ranging from 9 volts to 24 volts DC (To make a 5 volt power supply, we use a LM7805 voltage regulator IC (Integrated Circuit). The IC is shown below. The LM7805 is simple to use. You simply connect the positive lead of your unregulated DC power supply (anything from 9VDC to 24VDC) to the Input pin, connect the negative lead to the Common pin and then when you turn on the power, you get a 5 volt supply from the Output pin. The bread boarded circuit is shown below. The 5 Volt output is connected to the red power supply line of the breadboard. The ground from the input is connected to the blue ground line of the breadboard and a jumper wire is used to connect ground from there to the common (ground) pin of the 7805. Sometimes the input supply line may be noisy. To help smooth out this noise and get a better 5 volt output, a capacitor is usually added to the circuit, going between the 5 volt output and ground (GND). We use a 220 uF capacitor.
