964a5e6dfb
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30273 a1c6a512-1295-4272-9138-f99709370657
28 lines
1.3 KiB
TeX
28 lines
1.3 KiB
TeX
\subsection{Resistor Calculator}
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\screenshot{plugins/images/ss-resistor}{Resistor calculator}{img:resistor}
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The resistor calculator is a plugin that works in 3 modes:
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\subsubsection{Colour to Resistance}
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In Colour to Resistance mode, use the menus to select the colours of the
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bands of a resistor which you would like to know the resistance of.
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\subsubsection{Resistance to Colour}
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In Resistance to Colour mode, use the menus to select the unit that you
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would like to use (choose from Ohms, Kiloohms, Megaohms), and use
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the on-screen keyboard to input the value of the resistor that you would
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like to know the colour code of. The colour codes are presented
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\opt{lcd_color}{graphically and} textually.
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\subsubsection{LED resistance}
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LED resistance calculator is used to determine the resistor necessary to light
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an LED safely at a given voltage. First, select the voltage that the LED will
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use (the first option is the most common and a safe bet), and the current
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that it will draw (likewise with the first option). Then, use the onscreen
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keyboard to type in the supply voltage and, if selected, the custom
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forward current. This function produces safe estimates, but use your own
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judgement when using these output values. Power rating and displayed resistance
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are rounded up to the nearest common value.
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