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AMM-TE ICL7107 4 Digits Segments Digital Display Ammeter Kit DIY Module DC 5V 35mA DIY Kits

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Product Introduction:
1.Model:AMM-TE
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

Packing List:


Circuit Principle Picture:


Circuit Principle:
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

Tested by ICStation's Outstanding Partner ELECTROJUANYU:









Learn More Details in the Video:

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1. Hongkong / Sinapore Airmail

(1) Due to the high risk of package lost recently, we have to stop using the free shipping way these days. Hope for your kind understanding! And the $3 is for tracking number and delivery insurance ^0^ Enjoy order from us. 

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(2) Shipping time 
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7-15 working days to: Most of Asia countries
10-16 working days to: USA , Canada , Australia , UK , Most of Europe countries
13-20 working days to: Germany , Russia
18-25 working days to: France , Italy , Spain , South Africa
20-45 working days to: Brazil , Most of South America countries

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Total price of the order >= 200USD or Total weight of the order >= 2.2KG

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AMM-TE ICL7107 4 Digits Segments Digital Display Ammeter Kit DIY Module DC 5V 35mA DIY Kits
$4.79
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