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7805 Regulator IC Circuits

2018-02-28 22:45  
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Fixed voltage Positive and Negativeregulator ICsare used in circuits to give precise regulated voltage.78 XX seriesregulator IC can handle maximum 1 ampere current. The Regulator ICs require minimum 1.5 higher input voltage than their voltage rating. For example7805 ICrequires minimum6.5 voltsto give 5 volt output. Here are some circuit designs of IC 7805 to monitor the output voltage.

1.This is the manipulation of the RegulatorIC 7805to give9 volt regulatedoutput. Normally the pin2 of the regulator IC is connected to the ground. Here it is connected to a 3.9 volt Zener diode. So the output from the Regulator IC will be 9 volts.

7805 Circuit 1

2. This circuit can tell whether the IC 7805 is giving output or not. IC 7805 requires minimum 6.5 volt input to give 5 volt regulated output. When the input voltage is above 6.5 volts, Zener conducts and LED turns on indicating sufficient input voltage. Diffuse type Red LED requires 1.8 volts and Zener 4.7 volts .So to activate both these, input voltage should be minimum 6.5 volts. If the input voltage drops below 6.5 volts, Zener cutoff and LED turns off. This indicates the zero output from the regulator IC.

7805 Circuit 2

3. This is a simple LED monitor to tell the output voltage from 7805. If the input voltage is above 6.5 volts, LED shows full brightness. When the input voltage reduces below 6.5 volts, brightness of LED decreases.

7805 Circuit 3


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