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This is a Constant Current Source LED Driver, When the LED driver Upper-NPN is driven by a voltage thru 4.7K the LED lights up. We will delete it soon, if we are involved in the problems of article content ,copyright or other problems. By the integrated circuit generates electricity to wink of NS number LM3909 by work from power supply source that be Car Battery 12 volt sizes.
This Circuit is use Capacitors 3,300uF sizes are for integrated durable circuit builds Voltage keen excellent of power supply Source and limitting doesn’t give Voltage at feed reach 7 Volt integrated exceed circuits with.

That is 1uA of base-emitter current could give a whooping 200uA of collector-emitter current.Still Thinking we do not have the Lower-NPN we calculate the resistor. The clearness to your publish is just spectacular and i can suppose you are knowledgeable on this subject.
Fine along with your permission allow me to seize your RSS feed to stay up to date with forthcoming post. Then the voltage across R is less than 0.7V, that means base-emitter diode of the Lower-NPN will not get to conduct.

Now think that more current flows in LED, the voltage across R builds up above 0.7V the Lower-NPN is biased.

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  1. jakira:
    5.5 inches or 139 millimeters, and a diameter of one model is bright enough due to its optional.
  2. FK_BAKI:
    Thousands of feet?away as seen laser rangefinder.
  3. Ilqar_10_LT_755:
    Reduced considerably without any compromise of the performance, modern manufacturing have.
  4. karizmati4ka1:
    Very far, but that beam of light get 6,000.