Simple Battery Level Indicator Circuit
The circuit gets the power source for its operation from the battery of the instrument itself. It utilizes 10 LEDs connected in a 10-dot mode. Applying various coloured LEDs helps make it simplier and easier to determine the voltage level on the basis of the calibration made. Red LEDs (LED1 through LED3) show battery power of lower than 40 percent. Orange LEDs (LED4 through LED6) show battery power of 40 to lower than 70 percent and green Simple Battery Level Indicator circuit diagram. LEDs (LED7 through LED10) show battery power of 70 to below 100 percent. The brightness of the LEDs could be fine-tuned by altering the value of variable resistor VR2 in between pins 6 and 7.
In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.
In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.