12V power supplies (or 12VDC power supplies) are most common in use today.
In general, a 12VDC output is attained from a 120VAC or 240VAC input with a combination of transformers, diodes and transistors.

Applications for 12V DC power supplies:
Computer Peripherals and Networking Applications
Telecommunications and Fiber optic Network
Voice, Data and Analog Communications
Universities and Educational Facilities
Instrumentation and Electronics
Utility and Power Industries
Data Acquisition
Medical
Military
Motor control


12V power supplies have two categories: 12V regulated power supplies, and 12V unregulated power supplies. 12V regulated power supplies have also three styles:
Switching regulated AC to DC, Linear regulated AC to DC, and Switching regulated DC to DC.

Switching regulated 12VDC power supplies are also known as SMPS power supplies, switchers, or switched mode power supplies. they regulate the 12VDC output
voltage. a complex high frequency switching technique is used in this process. it
employs pulse width modulation and feedback.

Linear regulated 12VDC power supplies regulate the output with the help of a dissipative regulating circuit. This is an extremely stable, low ripple option. and have no switching frequencies to produce EMI. Galvanic isolation is standard in our 12VDC linears, affording our users input to output and output to ground isolation for maximum versatility. Linear regulated power supplies are available AC to DC single and wide adjust outputs. There are also more advanced Rainproof 12V Power Supplies.

Unregulated 12VDC power supplies are basic power supplies that come with an AC input and an unregulated 12VDC output. The output voltage keeps changing with the input voltage and load. These power supplies are not costly and they are extremely reliable.

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