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5v regulated power supply
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<blockquote data-quote="Byrd2" data-source="post: 213162" data-attributes="member: 384"><p>It depends on the power dissipation that the regulator has to do. The 78xx regulators are good up to very high temperatures. What causes dissipation in the regulator is the difference between input voltage and output voltage coupled with the power being supplied on the regulated (5V in this case) side of the circuit. The second circuit you posted has the 47Ohm resistor in order to absorb some of the dissipation by the regulator, but the resistor then is doing the dissipating. </p><p></p><p>You need to minimize the voltage in (try making it 1 / 2 volts above your regulated voltage). How much current does the Pi use?</p><p></p><p>On the other hand a USB charger seems an excellent and cheaper idea.</p></blockquote><p></p>
[QUOTE="Byrd2, post: 213162, member: 384"] It depends on the power dissipation that the regulator has to do. The 78xx regulators are good up to very high temperatures. What causes dissipation in the regulator is the difference between input voltage and output voltage coupled with the power being supplied on the regulated (5V in this case) side of the circuit. The second circuit you posted has the 47Ohm resistor in order to absorb some of the dissipation by the regulator, but the resistor then is doing the dissipating. You need to minimize the voltage in (try making it 1 / 2 volts above your regulated voltage). How much current does the Pi use? On the other hand a USB charger seems an excellent and cheaper idea. [/QUOTE]
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DIY & Tutorials
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5v regulated power supply
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