دانلود رایگان تعداد صفحه : 2Example LED Driver Circuit Running an LED with pulses to get maximum brightness
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Example LED Driver CircuitExample LED Driver Circuit Running an LED with pulses to get maximum brightness To give maximum brightness an LED needs to be driven by a pulse circuit. In this way, it is possible to put 0.5 Amp current pulses through an LED at a frequency of around 100Hz which fools the eye into thinking that it sees a continuous light. If the LED is run at 0.5 Amps for very long, it will burn out (usually within a fraction of a second). By keeping the pulse duration relatively short, we can avoid overheating the LED. This circuit allows adjust ment of the pulse width so that the maximum average current is no more than 50mA. To ensure long LED life, it should be adjusted for maximum brightness then reduced slightly to an average current of around 40mA. One or two LEDs can be driven simultaneously. C1 can be around 1000uF and acts as a reservoir because the average battery is unable to supply half Amp pulses of current. The circuit can be run from a battery or dc supply of 9 to 12 volts. We had intended to supply all the parts as a kit but weve had only 2 enquiries in two years. However, you should be able to order all the components from Maplin Electronics in the UK.
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