Car Radio Backup System: Electrical Explanations

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cassadana
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Back up system designed to prevent the loss of memory in a car radio when the radio is removed from the car,
how will you do this through electrical explanations..
 

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cassadana said:
Back up system designed to prevent the loss of memory in a car radio when the radio is removed from the car,
how will you do this through electrical explanations..

Sounds like a school asssignment. What is the context of the question? What have you come up with so far?