Fixed Regulators
"Fixed" three-terminal linear regulators are commonly available to generate fixed voltages of plus 3 V, and plus or minus 5 V, 6V, 9 V, 12 V, or 15 V, when the load is less than 1.5 amperes.
The "78xx" series (7805, 7812, etc.) regulate positive voltages while the "79xx" series (7905, 7912, etc.) regulate negative voltages. Often, the last two digits of the device number are the output voltage; e.g., a 7805 is a +5 V regulator, while a 7915 is a -15 V regulator. There are variants on the 78xx series ICs, such as 78L and 78S, some of which can supply up to 1.5 Amps.
Read more about this topic: Linear Regulator
Famous quotes containing the word fixed:
“But see, the Virgin blest
Hath laid her Babe to rest:
Time is our tedious song should here have ending;
Heaven’s youngest teemed star,
Hath fixed her polished car,
Her sleeping Lord with handmaid lamp attending;
And all about the courtly stable,
Bright-harnessed angels sit in order serviceable.”
—John Milton (1608–1674)