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12v is a common voltage supply rail used in Automotive, Computing, Battery, and Consumer devices. 12v is the highest commonly found in consumer device power supplies, though (through power supplies) has become very ubiquitous. Other common voltages are (mainly in audio devices due to the use of dual rail op amps), (Pushed by the need for lower powered and circuits), and 3v (mainly from using two 1.5v batteries).

Higher voltages can be found in dedicated chargers, for example, Laptops or Printers, but these are often internally regulated down to 12v, 5v, 3.3v, or lower.

Circuits connected to the so-called "12 VDC" power available in automobiles (often not anywhere close to 12 V) should be tagged instead. They require extra components and special techniques for dealing with load dumps, etc. that are unnecessary circuits powered by the "nice" 12 VDC supplied by computer power supply units (PSUs) plugged into or most other sources of 12 VDC.

12v is a common voltage supply rail used in Automotive, Computing, Battery, and Consumer devices. 12v is the highest commonly found in consumer device power supplies, though (through power supplies) has become very ubiquitous. Other common voltages are (mainly in audio devices due to the use of dual rail op amps), (Pushed by the need for lower powered and circuits), and 3v (mainly from using two 1.5v batteries).

Higher voltages can be found in dedicated chargers, for example, Laptops or Printers, but these are often internally regulated down to 12v, 5v, 3.3v, or lower.

12v is a common voltage supply rail used in Automotive, Computing, Battery, and Consumer devices. 12v is the highest commonly found in consumer device power supplies, though (through power supplies) has become very ubiquitous. Other common voltages are (mainly in audio devices due to the use of dual rail op amps), (Pushed by the need for lower powered and circuits), and 3v (mainly from using two 1.5v batteries).

Higher voltages can be found in dedicated chargers, for example, Laptops or Printers, but these are often internally regulated down to 12v, , 3.3v, or lower.

Circuits connected to the so-called "12 VDC" power available in automobiles (often not anywhere close to 12 V) should be tagged instead. They require extra components and special techniques for dealing with load dumps, etc. that are unnecessary circuits powered by the "nice" 12 VDC supplied by computer power supply units (PSUs) plugged into or most other sources of 12 VDC.

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12v is a common voltage supply rail used in Automotive, Computing, Battery, and Consumer devices. 12v is the highest commonly found in consumer device power supplies, though (through power supplies) has become very ubiquitous. Other common voltages are (mainly in audio devices due to the use of dual rail op amps), (Pushed by the need for lower powered and circuits), and 3v (mainly from using two 1.5v batteries).

Higher voltages can be found in dedicated chargers, for example, Laptops or Printers, but these are often internally regulated down to 12v, 5v, 3.3v, or lower.

12v is a common voltage supply rail used in Automotive, Computing, Battery, and Consumer devices. 12v is the highest commonly found in consumer device power supplies, though (through power supplies) has become very ubiquitous. Other common voltages are (mainly in audio devices due to the use of dual rail op amps), (Pushed by the need for lower powered and circuits), and 3v (mainly from using two 1.5v batteries).

Higher voltages can be found in dedicated chargers, for example, Laptops or Printers, but these are often internally regulated down to 12v, 5v, 3.3v, or lower.

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