| 摘要 |
PROBLEM TO BE SOLVED: To provide a light emitting diode driving circuit for device provided with constant-voltage DC power source which can reduce the power consumption of electronic equipment, such as the digitizer indicating controlled states with an LED by supplying electric power to a load from a constant-voltage DC power source. SOLUTION: The input-side Vin of a three-terminal regulator 11 which is a constant-voltage DC power source is connected to a primary power source 10 and the output side Vout is connected to a load 4. The anode side of an LED 12 is connected to the input side of the regulator 11 through a resistor Re and the cathode side is connected to the output side of the regulator 11. Since the LED 12 is connected in the above-mentioned way, the power consumption of a device can be reduced as compared with the conventional circuit which is connected in parallel with the load 4. |
