The 7805 is a three terminal +5 volt regulator.
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7805 ic is a voltage regulator,up to 5 Volts can maintain.
in ic 7805 their is two capacitor is used one of them is used for the settling/transient time and another is used to provide inductive effect....
Ic 7805 we are mostly used for regulator & its minimum input voltage is 7.2 V. Sandeep Chauhan
There could be a number of reasons. A 7805 has three pins: Voltage in, voltage out and an earth. If the earth is not tied to the earth reference (ground) of the circuit, the output will be held close to the input voltage. If there are no suppression capacitors on the inputs and outputs, high frequency oscillation can be present and at a level where some meters will read it as a DC shift. The IC may be damaged. It has a maximum input voltage of around 35V (dependent on the specific IC). Exceeding the input voltage doesn't do the IC any good at all. The other possibility is that the output side of the IC is being fed with a voltage from another part of the circuit. Keep taking the meter readings with the IC in circuit and out of circuit and one of these errors is likely to show up.
In linear IC'S the output voltage is very according to input voltage In digital IC's the output voltage is either high or low