Design DC Circuit for 15V Battery: +10V, +5V & -5V, Max Power 1mA

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SUMMARY

The discussion centers on designing a DC circuit powered by a 15V battery to achieve specific node voltages of +10V, +5V, and -5V, with a maximum power demand of 1mA. The initial attempt involved using four equal resistors of 4kΩ in series, resulting in incorrect node voltages of +7.5V, +3.75V, and -3.75V. Participants suggest reevaluating the resistor values and configuration to meet the voltage requirements accurately, emphasizing the importance of understanding voltage drops across resistors in series circuits.

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Homework Statement


Design a DC cct having a 15V battery to provide the following node voltages: +10V, +5V, and -5V with respect to a circuit ground node. Select your resistors such that the max power demand on the battery does not exceed 1mA.

The Attempt at a Solution



I made a cct with 4 series resistors. 15V source is in series with R1, which is in series with R2, which is in series with R3, which is in series with R4. Since in the question the voltage drops are all equal (5V), I selected 4 equal resistors of 4k. With this design I can node voltages of +7.5, +3.75 and -3.75 with respect to a circuit ground. (I chose the cct ground to be the node connecting R3 and R4)

For the life of me, I don't see a way to get the node voltages specified in the question. Can somebody PLEASE guide me in the right direction??
 
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Try sketching down the outputs you want in order, starting with -5V, 0V (ground), 5V and 10V. How many gaps are there between the nodes?
 

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