Voltage regulator diodes (Zener Diodes)
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.
7809 is a 9V Voltage Regulator that restricts the voltage output to 9V and draws 9V regulated power supply. The 7809 is the most common, as its regulated 9-volt supply provides a convenient power source for most TTL components.
