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Figure 14 - Building the high current pulser on a solderless breadboard
Figure 14 - Building the high current pulser on a solderless breadboard

The changes to the new schematic involve only swapping out the low current 2N2222 transistor for a high current transistor such as the TIP120. I also removed the current limiting resistor R2 and ran my LEDs in a series parallel configuration to reduce the pulsed current to each LED slightly. If you wanted to make the output variable, you could add a 100K potentiometer in place of R3 in order to reduce the drive to the base of the transistor. Some experimentation will certainly be necessary if you plan to get the maximum output from your LEDs.



Figure 15 - The completed infrared pulse circuit is made on a bit of perforated board
Figure 15 - The completed infrared pulse circuit is made on a bit of perforated board

To allow the pulse circuit to be tested around the house, I rebuilt the circuit on a bit of perforated board as shown in Figure 15. All wiring is made by connecting the wires on the underside of the board to form traces. Perforated board is great for fast prototyping of small to medium circuits and changes are easily made by simply moving wires around.

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