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The Infamous LED Driverltinsert music Dunt Dunt
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• Weekly Progress Report
• 2004 February 4th

NIU
Tony Dmytriw
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Todays Presentation

• Overview of LED Driver Project
• How it was built
• Results that have been attained

NIU
Tony Dmytriw
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Overview Of LED Driver

• Why am I working on this?
• ?There is a need for an LED driver that delivers
  a very constant current, which in turn, gives off
  a very constant amount of light that can be used
  to emulate a certain amount of photons

NIU
Tony Dmytriw
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Overview Of LED Driver
The Circuit
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Tony Dmytriw
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Prototype

• A prototype has been made
• A layout was drawn
• A board was etched
• Components were soldered on

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Tony Dmytriw
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Steps

• 1 ? Draw out a Layout in AutoCad

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Tony Dmytriw
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Steps (continued)

• 2 ? Print it out on Photo paper in a 11 ratio

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Tony Dmytriw
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Steps (continued)
Copper Clad

• 3 ? Iron it on to the
  circuit board with a iron

HOT
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Tony Dmytriw
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Steps (continued)

• 4 ? Using Ferric Cloride (FeCl3) and a Hot
  Plate, Etch the circuit board removing all the
  unwanted Copper

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Steps (continued)

• 5 ? Drill the holes for the components and
  solder them onto the board.

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The LED Driver Circuit Board
NIU
Tony Dmytriw
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Testing

• Originally, I wanted to see the current pulse
  that flows through the LED however, due to the
  slow sampling rate of the Pico-Ammeter and the
  Program written for Lab-View, this is was not
  attainable at this time

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Tony Dmytriw
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Testing (continued)

• Solution
• Look at the Voltage Pulse created across a
  resistor and compare it with a spice simulation

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Tony Dmytriw
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Simulation Results
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Tony Dmytriw
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Actual Wa eform
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Tony Dmytriw
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Actual Wa eform
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Tony Dmytriw
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Things to Consider

• The Waveform shown may not be a good
  representation of the actual pulse. This is due
  to the the 500 MHz scope sampling frequency
  (which means it samples every 2 ns). Since we
  are dealing with pulses in the nano-second range,
  the waveform may be lacking as a really good
  representation of the actual pulse.

NIU
Tony Dmytriw
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The End

• Thank you very much and have a nice day.

NIU
Tony Dmytriw