Power supplay (Adapter)

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12 volt dual voltage of adapter

• Transformator 18v-CT (min)
• Capasitor 35v
• Bridge Rectifier 2 Ampere /100 v
• c4, c5 Ceramic

12 VOLT 20 Ampere of adapter



Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 20 amps.

+12Volt|-12Volt Dual Regulator Power Supplay

type='html'>This is of a dual regulated that provides +12V and -12V from the AC mains. A regulator like this is a very essential tool on the work bench of an electronic hobbyist.

Transformer T1 steps down the AC mains voltage and diodes D1, D2, D3 and D4 does the job of rectification. Capacitors C1 and C2 does of filtering.C3, C4, C7and C8 are decoupling capacitors. IC 7812 and 7912 are used for the purpose of voltage regulation in which the former is a positive 12V regulator and later is a negative 12V regulator. The output of 7812 will be +12V and that of 7912 will be -12V.

Skema rangkaian Dual Regulator Power Supplay

IC regulator 78xx

IC regulator 79xx

Note:

• Use Transformer 15-0-15 V, 1A secondary step-down transformer.
• Capacitor C1,C2,C5 and C6 must be rated 50V or more.

IC regulator 78xx (7812) Description

The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single point regulation.

Maximum Ratings

• Input Voltage (VO = 5V, 12V and 15V) : 35V
• Operating Temperature Range (TA) : 0°C to +70°C
• Maximum Junction Temperature : 150°C
• Storage Temperature Range −65°C to +150°C
• Lead Temperature (Soldering, 10 sec.)

IC regulator 79xx (7912) Description

The LM79XX series of three-terminal negative regulators are available with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shutdown and safe operating area protection, making it essentially indestructible.


Maximum Ratings

• Input Voltage (VO = -5V, to 15V) : 35V
• Operating Temperature Range (TA) : 0°C to +70°C
• Maximum Junction Temperature : 150°C
• Storage Temperature Range −65°C to +150°C
• Lead Temperature (Soldering, 10 sec.)

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Rangkaian Power Supplay

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Electronic devices should be powered by direct current supply DC (direct current) which is stable in order to work properly. The battery or batteries is a source of DC power supply is best. But for applications that require greater power supply, the source of the battery is not enough. Sources of power supply is a source of alternating AC (alternating current) from power plants. This requires a power supply device that can change the AC into DC current.

Rangkaian Power Supplay

Now it should not need another effort to make good pwer supplay you do not need to look for op-amps, transistors and other components, because these circuits are packaged into a single fixed voltage regulator IC. Are now widely recognized as a component of 78XX series fixed positive voltage regulator and the 79XX series is a voltage regulator to remain negative. Even these components are usually already equipped with current limiting (current limiter) and also limiting the temperature (thermal shutdown). This component is only three pins, and by adding some components alone can be a series of power supply regulation was good.

Skema rangkaian power supplay

It's just to note that the IC regulator circuit that can work, the input voltage must be greater than the output voltage regulator. Usually the difference voltage Vin to the recommended VM is in the component datasheet. Usage heatshink (Aluminum cooling) is recommended if these components are used to supply large currents. In the datasheet, these components can pass the maximum current reached 1 A.