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Search results: 142   Output: 81-90
  1. In this post I will try to show, why it's a good idea to use a current limiting resistor for an LED. And when it's save to drive the LED without any resistor. If you read about LEDs, you will notice that everyone tells you, that you need a current ...
    06-04-2009
  2. Alex Inspired by various LED Throwies, blinking LEDs and similar instructables I wanted to do my version of an LED controlled by a microcontroller. The idea is to make the LED blinking sequence reprogrammable. This reprogramming can be done with ...
    29-03-2009
  3. Almost all inexpensive commercial LED flashlights use a 4.5 V power supply three AA or AAA batteries because white LEDs require 3.3 to 3.5 V to fully turn on. Thus, there is a voltage gap between LEDs and traditional 3 V incandescent-flashlight ...
    08-02-2009
  4. This is a remake of the fireflies which I did a year ago. I was always fascinated by the emergence of patterns. One I like most is the synchronization of hundreds or thousands of fireflies. First they flash randomly but after some time and ...
    26-01-2009
  5. Using a CMOS 555 timer and a single NPN transistor, you can drive as many as seven LEDs using a minimal amount of voltage and power from a single NiMH (nickel-metal-hydride) AA cell. The circuit works by creating much higher-voltage pulses than the ...
    03-12-2008
  6. Here is a new version of the classic color organ, where different color lights are triggered by different frequencies of sound, resulting in a display that flashes along to music. In this case the newer type high intensity LEDs (3000 - 5000mcd) ...
    13-11-2008
  7. Description: This circuit will power a 6 inch 4 Watt fluorescent tube off a 12 Volt supply, consuming 300 mA. It may also be powered by a suitably rated universal AC/DC adapter. Advantages of the design are: good light, low power consumption, and ...
    05-11-2008
  8. Dave Clausen The problem: Grass dies without strong sunlight. The solution: Construct a grow light that doesn't consume a lot of power, doesn't block the natural sunlight, and produces natural-looking colors. Step 1: Solder up strings of red, ...
    02-11-2008
  9. Here is a white-LED-based emergency light that offers the following advantages: It is highly bright due to the use of white LEDs. The light turns on automatically when mains supply fails, and turns off when mains power resumes. It has its own ...
    01-09-2008
  10. joe The LED VU Meter was the height of late 80-s boombox technology. This instructable will build one out on the breadboard. Who doesn't like blinking lights.. You will need either the National Semiconductor LM3916 / LM3915 / LM3914 , 2 for ...
    Circuits » Audio · Light » National Semiconductor » LM3914, LM3915, LM3916
    01-09-2008
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