| 摘要 |
A constant current supply circuit is provided to simplify a circuit configuration by not adding an amplification circuit while using a resistor as a reference source of the current. A bridge circuit is connected to a commercial DC power source and is composed of a diode, an LED, and a zener diode using a PN junction to connect a first resistor, a second resistor, and a third resistor in series. A constant current controller is connected to the commercial DC power source, receives the output voltage of the bridge circuit, and controls the constant current of the bridge circuit. A transistor receives the voltage outputted from the constant current controller and supplies the current to the bridge circuit. |
