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Search results: 145   Output: 81-90
  1. LEDs in portable devices often show power status, battery status, or Bluetooth-connection activity. LEDs can be major factors in determining battery life because their intensity is directly proportional to power drain. Using a simple circuit, the ...
    Circuits » Light » Altera » EMP240
    13-07-2009
  2. An ordinary automatic room power control circuit has only one light sensor. So when a person enters the room it gets one pulse and the lights come ‘on.’ When the person goes out it gets another pulse and the lights go ‘off.’ ...
    01-07-2009
  3. Ahmad Ayar The main source of power in a telecommunications system is -48 V. This source’s negative polarity and its large magnitude with respect to ground pose a challenge when designers want to use low-power ICs in the telecom ...
    25-06-2009
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
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