Difference between revisions of "File:Linear Dimmer CAT4101.png"
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Jump to navigationJump to search (Brightness control is achieved by dividing a 0-5V signal generated by the brightness trimpot then using the resulting voltage to set a current through a sense resistor. The sense resistor is 300Ω, meaning that the voltage across it for 2.5mA is 750mV. Th) |
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| − | Brightness control is achieved by dividing a 0-5V signal generated by the brightness trimpot then using the resulting voltage to set a current through a sense resistor. The sense resistor is 300Ω, meaning that the voltage across it for 2.5mA is 750mV. Thus, the divider must then be set to divide the buffered 5V signal by 6.67, or 15% of a trimpot. The circuit | + | Brightness control is achieved by dividing a 0-5V signal generated by the brightness trimpot then using the resulting voltage to set a current through a sense resistor. The sense resistor is 300Ω, meaning that the voltage across it for 2.5mA is 750mV. Thus, the divider must then be set to divide the buffered 5V signal by 6.67, or 15% of a trimpot. The circuit uses both sides of a dual rail-to-rail op-amp. |
Latest revision as of 11:54, 26 February 2014
Brightness control is achieved by dividing a 0-5V signal generated by the brightness trimpot then using the resulting voltage to set a current through a sense resistor. The sense resistor is 300Ω, meaning that the voltage across it for 2.5mA is 750mV. Thus, the divider must then be set to divide the buffered 5V signal by 6.67, or 15% of a trimpot. The circuit uses both sides of a dual rail-to-rail op-amp.
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| current | 11:48, 26 February 2014 |  | 1,184 × 412 (19 KB) | NebarnixWikiSysop (talk | contribs) | Brightness control is achieved by dividing a 0-5V signal generated by the brightness trimpot then using the resulting voltage to set a current through a sense resistor. The sense resistor is 300Ω, meaning that the voltage across it for 2.5mA is 750mV. Th |
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