ELEC 332

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Build a battery power supply module that will plug into the ELEC 332 breadboard and provide a regulated 5 V power source from an onboard 7.4 V battery or from an external 12 V unregulated wall wart.

Specifications

Input voltage.

7-14 V.

Output voltage.

Either 5.0 V or 3.3 V, jumper selectable

Output current.

Up to 500 mA.

Battery connector.

JST RCY female connector. This is the connector used on a number of small radio-controlled vehicles, and will be available as a stock part.

12 V connector.

2.1 x 5.5 mm coaxial power connector, e.g. Cui PJ-047A or PJ-028A. Center pin positive. These will also be available.

Output connector.

Standard ELEC 332 breadboard J1 connector.

Regulator.

Since high regulator efficiency is essential to achieve maximum battery life, you should use a switching, rather than linear, regulator.

Size.

Your system must be contained on a standard 3" x 1.5" ELEC 332 breadboard module (the same as was used in the previous exercise).

Cost.

In addition to the stock parts available in the lab, you may order any parts that you require, as specified in Ordering parts Excluding stock parts and the battery, your total expendature for parts must be less than $50.