| 摘要 |
PROBLEM TO BE SOLVED: To know the quantity of currents consumed and instantly grasp the residual capacity capable of terminal connection of a power source part by lighting the LED serving as an indicator, with respect of the output current of a power source. SOLUTION: A power feeder supplies a plurality of terminals 2a, 2b,... with output voltage V1 through a common power source line 3 from a power source 1. Then, power is generated by a three-terminal regulator 13, and it is inputted into the input terminals of voltage comparators 10a, 10b, 10c, and 10d, with the reference voltages Va, Vb, Vc, and Vd generated by reference voltage circuits Ra, Rb, Rc, Rd, and Re as the thresholds. If it is smaller than the voltage amplified by a differential amplifier 12, the LEDs of indicators 11a, 11b, 11c, 11d, and 11e are lit. From this, a user is able to know how much currents have been consumed. |
