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i think instead of building a complete circuit for diy adjustable dc power supply. use 19v adapter with LM317 with series pass transistor. arduino and sensors need very low current in mA and Vindc of 5vdc or 3.3vdc .but for motor like small servo motor include series pass transistor.

[QUOTE="codemaster11, post: 1789032, member: 623953"] i think instead of building a complete circuit for diy adjustable dc power supply. use 19v adapter with LM317 with series pass transistor. arduino and sensors need very low current in mA and Vindc of 5vdc or 3.3vdc .but for motor like small servo motor include series pass transistor. [/QUOTE]

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