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Circuit Principle:
4.Input circuit is composed of J1, R5, R6 and C3. When the current of measured circuit passes through R5,it will generate a voltage on R5. This voltage will be input to chip 31-pin through R6 current limiting and be processed, C3 is input voltage filtering capacitor.
5.Display circuit is composed of DS1-DS4, D1, D4, 4 digital tubes can be drived directly by the chip. R10 is current limiting resistance of DS1-DS3 digital tubes decimal points.

Finished Product Debugging:
1.After connecting with DC 5V (please notice the polarity),the digital tube will display -.000 or .000,this is normal.
2.Use multimeter to measure the voltage between chip 36-pin and 35-pin,and adjust VR1 potentiometer let it be 100mV.

Key Points Voltage Reference Value:
1.Chip 1-pin and 21-pin: 5V.
2.Chip 36-pin and 21-pin: 100mV,
3.Chip 26-pin and 21-pin: -5V.

Specification:
Material: PCB + Metal + Plastic
Type: Digital Ammeter Kit
Panel Size:79 x 44mm / 3.11 x 1.73in
Mount Size:71 x 39mm / 2.8 x 1.53in
Quantity: 1 Pc

Electricity Parameters:
Working Voltage: DC 5V
Working Current: 35 mA
Accuracy: ±1mA
Measuring Range: 0 - 2A
Over Range Indication: Primacy Display 1/-1
Display Color: Red
Quantity: 1Set
Package includes:
1Set x Digital Ammeter Kit