Here this circuit diagram is for +12V regulated (fixed voltage) DC power supply. These power supply circuit diagram is ideal for an average current requirement of 1Amp. This circuit is based on IC LM7812. It is a 3-terminal (+ve) voltage regulator IC. It has short circuit protection , thermal overload protection. LM7812 IC is from LM78XX series. The LM78XX series IC is positive voltage regulator IC for different voltage requirements, for example LM7805 IC is made for 5 volt fixed output voltage . There is LM79XX IC series for negative voltage .
Circuit diagram of 12V fixed voltage power supply
![](http://3.bp.blogspot.com/-EaWjPhhwdRY/UQV36f3wgHI/AAAAAAAAAdE/P0FC_VE7awc/s1600/12V-regulated-power-supply-circuit-diagram.png)
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