Diy LM3914 дисплей доска тестер общий 12 В батарея 3 7 в литиевая уровень мощности

Diy LM3914 дисплей доска тестер общий 12 В батарея 3 7 в литиевая уровень мощности

Note:

Red connection positive, black negative, must not be reversed, or directly scrapped, the module maximum voltage is 20V DC,  please use anti-static welding or soldering station pull electric heat welding.

To adjust the voltage, we must understand the above steps, according to the order of the order can not be adjusted, the first adjustment of the high-end, and then adjust the low-end, blindly causing chaos is difficult to restore.

Color: Red, Green, Blue ( send random)

Measuring range: Universal 2.4-20v battery

PCD board size: 45 * 14 mm

Display mode: Multi lamp or single lamp display

Power consumption: Bar display full bright 42mA, single lamp display 4mA

Package List: 1 x LM3914 Display Board Tester 

Adjustment method:
Required equipment: adjustable voltage power supply one, the board precision display accuracy. A little screwdriver.
Single lithium 3.7V, for example 3V for low-end power supply, 4.2V filled with high-end.
1. Adjust the power supply voltage to the voltage required to display the high voltage of 4.2V, connected to the circuit board, there are two results: one is not bright, one is bright or bright several. At this point in the 503 (50K) potentiometer slowly adjust the circuit board until the LED lights up. Do not light up or light up a few counterclockwise adjustments when the entire lamp rotates clockwise.
2. Turn the power supply to the required low voltage 3V. Adjust the 502 (5K) potentiometer on the circuit board, just light up an LED, do not light the clockwise adjustment, light up a few or all light counterclockwise.
3. Patiently repeat the first step in the second step. Usually 2 times to adjust to the desired range.
If there is no high precision adjustable power supply, a simple way to adjust the battery is full of high voltage, battery.
Power as low as possible, enter the circuit board to adjust the power supply.

Various batteries show the high and low voltage range adjustment table below:

1. lithium battery:

 After the completion of a single lithium battery discharge voltage of 3V, full power 4.2V;

1S corresponds to 3V (first lamp) to 4.2V (Tenth lamps);
2S corresponds to 6V (first lamp) to 8.4V (Tenth lamps);
3S corresponds to 9V (first lamp) to 12.6V (Tenth lamps);
4S corresponds to 12V (first lamp) to 16.8V (Tenth lamps);
Other series voltage.

 Lead acid is generally 6V or 12V battery:

6V corresponds to 4.8V (first red light) to 6.75V (Tenth lamps);
12V corresponds to 9.6V (first red light) to 13.5V (Tenth lamps);
According to the design of the standard battery discharge range, the module can accurately reflect the battery power, so that the user can observe the state of the battery at any time.

Display Mode A / P: full brightness linear / single lamp lattice mode switch, the default is a linear model, the board set aside a switch pad, even with soldering pads can be turned into full light linear mode, no welding is the point like single light display.

RM42399920692558