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:
Where is 12V and V required is 8V. Substitute:
Let's choose and because the load resistance must be high relatively to the divider's resistances to work effectively.
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