Skema Dual Regulator power supplay +12 dan -12

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.

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.

Features IC LM7812

Output current in excess of 1A

Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18 , 24V

Internal thermal overload protection

No external components required

Output transistor safe area protection

Internal short circuit current limit

Absolute Maximum Ratings IC LM7812

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

Features IC LM7912

• Output Current in Excess of 1A

• Output Voltages of -5, -6, -8, -9, -10, -12, -15, -18 , -24V

• Internal Thermal Overload Protection

No external components required

• Short Circuit Protection

• Output Transistor Safe Operating Area Compensation

Absolute Maximum Ratings IC LM7912

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.)