Single Output Power Supply +5V to +15 V / 1A based on LM78xx

This power supply is very simple and suitable for the device either analog or digital type. Key Features of the power supply:
Voltage: 5 V, 6 V, 8 V, 9 V, 12 V or 15 V
Current: 1 A
Regulated: Yes

This single output power supply circuit uses a voltage regulator which is quite famous LM78xx fixed type. Output voltage of 5 V here, but the adoption of other values ​​from +5 V to +15 V is very possible, with the changes described in the image above. The current that can be drawn from this supply is directly related to the type of regulator used here and is limited to 1 A, and therefore provided to add a heatsink for cooling. This power is required even if you do not need 1 A; current supplied by power supply depending on the needs of the device. If we connect the device consumes 100 mA current at the power source capable of providing a value of 1 A, it will only provide 100 mA.

Before starting assembly, it is useful to describe two or three things about your power supply. This type of regulator used in theory can provide a maximum current 1.5 A. Under such currents, the controller gets a lot of heat, and are in thermal protection if it is too hot (it turns itself off to protect itself, and released when the temperature has returned correctly). Heating controller depends on two factors: the potential difference between the input and output, and the current passing through it (which is what will cost you). If the potential difference is important, you can not make a lot of power to the controller. At the same time, the controller must have input voltage of 3 V above the output voltage (for +5 V regulated output, the input voltage must be at least 8 V). Knowing that the voltage regulator receives input as high as 37V, you will discover what makes sense between the two limits, depending on the desired output current. For the summarize, if you want to get high current (say, 1 A), you should not apply overload input voltage (say it will be limited to 10 V. V 0.12 to 5 V output). To be able to work the regulator in the power range incurred, it is very important to provide cooling heatsink.