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Search results: 139   Output: 71-80
  1. Paul Hill The circuit is drawn with PCB 123 which you can download for free from http://www.pcb123.com Click for enlarge As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the ...
    18-08-2009
  2. Constant current circuitry 12V Battery operation Circuit diagram: Parts: R1 10K 1/4W Resistor R2 33R 1/4W Resistor (See Notes) R3 15R 1/4W Resistor (See Notes) D1 1N5819 40V 1A Schottky-barrier Diode (See Notes) D2--D13 LEDs High brightness, high ...
    05-08-2009
  3. Bar-mode LED-cluster sequencer Can drive up to 16 clusters Circuit diagram: Parts: R1,R5 1K 1/4W Resistors R2 33K 1/4W Resistor R3 100K 1/2W Trimmer Cermet R4 1M 1/4W Resistor R6,R7,R8 10K 1/4W Resistors R9 4K7 1/4W Resistor R10 33R 1/4W Resistor ...
    29-07-2009
  4. Ultra-low current drawing 1.5V battery supply Circuit diagram: Parts: R1, R2 1M 1/4W Resistors R3 47K 1/4W Resistor (optional: see Notes) R4 Photo resistor (any type, optional: see Notes) C1 100nF 63V Polyester Capacitor C2 220µF 25V ...
    21-07-2009
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
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