2. LED Constant Current Drivers

Figure 13 shows the circuit diagram of the two LED constant current drivers. The LM317’s must each be mounted on a heat sink. The IRF9630 and BC107 form an on/off switch of the High Current feed to the LED. The current fed to the LED is thus Normal (189mA) or the sum of Normal plus High Current ( 568mA) = 757 mA. I modified the 2R2 to 1R8 to increase the High Current to (694mA) so the sum is now 883 mA. An equivalent range of f 3.4 to f 8. Photograph 24 shows the two drivers for the LED and the PIC board.



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