7909 Voltage Regulator - TO220

Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a different input voltage. In our case the 7909 IC is a negative 9V regulator, meaning it provides -9V as output. The name 7909 has two meanings, "79" means it is a negative voltage regulator and "09" means it provides 9V as output.

 

Negative voltage regulators are mainly Op- It is used in amp and other circuits where negative supply voltage is required. In many cases where an Op-Amp is operating on a dual-mode power supply, a negative voltage will be regulated by these 79XX ICs.