7909 is a negative 9V Voltage Regulator that restricts the voltage output to –9V and draws -9V regulated power supply. The 7909 is the most common, as its regulated -9 volt supply provides a convenient power source for most TTL components.
7909 is a series of 79XX negative voltage regulators (as known as L79xx, LM79xx, MC79xx…), the xx is replaced with two digits, indicating the output voltage (for example, the 7905 has a negative 5-volts output, while the 7912 produces negative 12-volts).
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