Answer to Question #85275 in Electric Circuits for Anand

Question #85275
You are given one IC 7812 and you require +8V regulated voltage. Design and draw
a circuit to obtain the required voltage by using this IC and appropriate resistors.
1
Expert's answer
2019-02-25T10:41:51-0500

IC 7812 is a voltage regulator with the input voltage 14.6 - 35 VDC and the output voltage of 12 V. We need 8 volts, so design the circuit:


We'll use a voltage divider to obtain 8 V from 12 V by the following expressions:


R2=R11VoutVrequired1R_2=R_1\frac{1}{\frac{V_{out}}{V_{required}}-1}


Where VoutV_{out} is 12V and V required is 8V. Substitute:


R2=2R1.R_2=2R_1.


Let's choose R1=10 ΩR_1=10 \text{ }\Omega and R2=20 ΩR_2=20 \text{ }\Omega because the load resistance must be high relatively to the divider's resistances to work effectively.


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