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Case 101: In at Whatever, Out at 12:00

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John Linstrom likes to listen to his portable tape player while traveling, but it made quick roadkill of the batteries. The car's 12V system would eliminate the carnage, but the range of voltage at the lighter socket was too wide to power the tape player directly. This Buck/Boost voltage regulator solved that problem. It converts 9-14V to a steady 12.0V at up to 1A. Now John and his tape player are happy travelers. If you need a stable dc supply to power your electronic traveling companion, this is for you. Changing two resistors will set the output voltage to replace the stack of “D” cells in any boom box.

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"On the Road Again"

Amt Part Description

 Allied Part #
1 1uF 50V Aluminum Electrolytic Capacitor 613-0656
2 0.1uF 50V Ceramic Capacitor 881-0158
2 1000uF 50V Aluminum Electrolytic Capacitor 859-2224
1 Schottky Rectifier 30V 3A (SR303) 266-0279 or 950-0175 or 950-3610
1 TO-220 Heatsink 619-0134
1 Lighter Plug 283-1175
2 50-100uH 4.8A Inductor 967-8760
1 1K, 1/4W, 5% Resistor 832-0537
1 10.2K, 1/8W, 1% Resistor 895-0356
1 1.18K, 1/8W, 1% Resistor 895-0903
Other Parts:
1-LT1271CQT (Linear Tech) Switching Regulator IC
2-Low ESR 3300-4700 uF 16v Aluminum Electrolytic Capacitors, min 4.8 A Ripple Current Rating (See Text)
1-Project Box, min 4 cu in
Output Termination(s) to match your requirement

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