2.PCB Size: 70.6*39mm
3.Display Window Size: 51*24mm
4.Operating Voltage: DC 5V
5.Operating Current: 35mA
6.Measurement Precision: +/-1mA
7.Measurement Range: 0-2A
8.Overrange Display: the first bit displays 1 or -1
9.Display Color: Red
|Metal Film Resistor||0.1 ohm/2W||R5||1|
|Metal Film Resistor||2K ohm||R1,R9||2|
|Metal Film Resistor||56K ohm||R2||1|
|Metal Film Resistor||1M ohm||R6||1|
|Metal Film Resistor||100 ohm||R3||1|
|Metal Film Resistor||270 ohm||R10||1|
|Metal Film Resistor||20K ohm||R8||1|
|Metal Film Resistor||47K ohm||R7||1|
|Metal Film Resistor||100K ohm||R4||1|
|Digital Tube||1 bit Common Anode Red||DS1-DS4||4|
|Potentiometer||3296 1K ohm||VR1||1|
|Power Wire||2P Single Head||1|
AMM-TE ammeter is mainly composed of ICL7107, power circuit, reference voltage source,
input circuit and display circuit.
▲1. ICL7107 is a BCD output integral type A/D conversion chip, its internal includes ;linear amplification, analog switch,oscillation,display driving etc.
▲2. Power circuit is divided into positive power and negative power; positive power is input by J2,C8 filtering; negative is composed of R8,Q1,L1,C6,C7,D2,D3 and ZD1,and generate -5V voltage is input by chip 26th pin.
▲3. Reference voltage source is composed of R1,R2,VR1,R9 and U2;36-pin is reference voltage input pin; adjust VR1 potentiometer to let 36-pin voltage be 100mV.
▲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 voltage 5V
2.Chip 36-pin and 21-pin voltage 100mV
3.Chip 26-pin and 21-pin voltage -5V
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I. Tested by ICStation's Outstanding Partner ELECTROJUANYU:
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(The language in the video is Spanish)
II. Tested by ICStation's Outstanding Partner arduinoLab:
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(The language in the video is Russian)
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