The
available voltage from a voltage source that is usually not appropriate
to the needs. It is necessary for a voltage regulator that functions to
maintain the constant voltage value on a certain value. Voltage
regulator chip is usually a code with the 78xx or 79xx. For the 79xx
series is used for DC negative voltage regulator. xx indicates the
regulator output voltage. For example, the system needs is a -5 volt
negative, the regulator used is 7905. Chip regulator consists of three
pins, namely input, output and ground. In this IC uses the input voltage
must be greater several percent (depending on the data sheet) from the
value output voltage.
physical 79xx regulator chip
