Occasionally some PC power supplies I’ve seen a different fan control circuit usually transistor circuits are used , but in this circuit 7805-5 volt positive regulator IC 1 7v zener 1 x 470 ohm...Electronics Projects, Regulator 7805 with Fan control
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Occasionally some PC power supplies I’ve seen a different fan control circuit usually transistor circuits are used , but in this circuit 7805-5 volt positive regulator IC 1 7v zener 1 x 470 ohm resistor and 3k NTC used logic simple first voltage amplification phenomenon Let me tell you though 78xx , 79xx series and similar regulators known in anything but those who do not have the regulator in the chassis leg as a sort of setting end can be counted but only for an upgrade available so 7805 output zener or regular diode can be upgraded with , but not down- that’s logical fan -tested Meanwhile, thanks to 470ohm zener connected to the 5v output to be slightly higher outside the NTC is provided
Fan control circuit diagram used for;
Voltage to upgrade zen and says connection diagrams below were given zener value until the upgrade can be done , for example 7812 12v output gives 3v zener is connected 15v output describes its diode is connected 0.6 volt is a rise diodes connected in series and the voltage can increase , for example 7805 5 volts gives 2 1N4001 series tied 6.2v you can get different names of the same nature as I said, can also be used in an integrated regulator I can not remember the last name 1.8v voltage regulator had an urgent need to upgrade upgrades have made with this method