AMM-TE ammeter Manual I. Kit Details

Kit Name: Ammeter Kit Kit Model: AMM-TE

PCB Size: 70.6 * 39mm Screen size: 51 * 24mm

Electrical parameters

Operating voltage: DC5V Operating Current: 35mA Accuracy: ± 1mA

Measurement range: 0 ~ 2A Outrange display: the first data 1 or -1

Display color: red

Ⅱ.Circuit

Diagram

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 202122232425262728293031323334353637383940

U1

ICL7107CPLZ

E D

V C PBAVFG

DS1

E D

V C PBAVFG

DS2

E D

V C PBAVFG

DS3

E D

V C PBAVFG

DS4

1G VC 1C1C 1P

2G 2F VC 2A 2B

2E 2D 2C 2P

3G 3F VC 3A 3B

3E 3D 3C 3P 4E 4D 4C

4G 4F VC 4A 4B5V

4D 4C 4B 4A 4F 4G 4E 3D 3C 3B 3A 3F 3E 2D 2B 2F 2E 1C 1G

2G2A2C3G

C1101

C4

474 C5

224

R12K

R4

100K

R256K

R747K

C2104

VR1

1K

12

3U2

TL431A

R92K

5V R61M

R5

1 2J1

C3103

Q1

C1815

R820KR3

100R

L1 2.2mH

C610UF/25V

C710UF/25V

5V

5V VC

C8104

12

J2 5V

�益奇 子

ZD1

5V1

D1

1N4148

D3

1N4148

D21N4148

R10270R

� � �小 点

200

20

2

III. Circuit Principle

AMM-TE ammeter is mainly composed of ICL7107, the power supply circuit, a reference voltage source,

the input circuit and display circuit.

1. ICL7107 is a BCD output of the integrator Type A / D converter chip, contains internal linear

amplification, analog switches, vibration, display drivers and other components.

2. The power circuits into positive and negative supplies, the positive supply by the J2 input, C8 filter;

negative power from the R8, Q1, L1, C6, C7, D2, D3 and ZD1 like, -5V voltage generated by the chip 26

feet input.

3. The reference voltage source is R1, R2, VR1, R9 and U2 constituted 36 feet for the reference voltage

input pin, VR1 potentiometer to adjust the voltage of 100mV to 36 feet.

4. Enter the circuit J1, R5, R6 and C3 constitute, by measuring the current flowing through the circuit R5,

it will produce a voltage on the R5, R6 after the voltage by limiting the input to the chip 31 feet for the

treatment, C3 as input voltage filter capacitor.

5. The circuit consists of DS1 ~ DS4, D1, R3 configuration, four digital tube directly driven by the chip,

R10 is DS1 ~ DS3 These three LED point limiting resistor.

IV. Finished debugging

1. Access DC 5V voltage (note polarity), or a digital display -.000 .000 is normal.

2. Use a multimeter to measure voltage chip 36 feet and 35 feet between the regulator VR1

potentiometer, so this is the pressure of 100mV can.

V. The key point voltage reference value

1. The chip 1 foot and 21 feet - voltage 5V

2. The chip 36 feet and 21 feet - voltage 100mV

3. The chip 26 feet and 21 feet - voltage -5V

Parts list Note: Since the batch is not the same, could lead to some elements out of stock, it will be replaced with similar functions components There are some differences between the products and the list! Use the material object as the standard!

Name Model/specific

ation

Serial

numbe

r

Quantit

y

Name Model/specificati

on

Serial

number

Quantit

y

5-color

resistance

0.1R 2W R5 1 diode 1N4148 D1 D2

D3

3

2K R1

R9

2 voltage-regulat

diode

ST5V1 ZD1 1

56K R2 1 Transistor C1815 Q1 1

1M R6 1 inductance 2.2mH L1 1

4-color

resistance

100R R3 1 Digital tube 1bit common

positive RED

DS1~DS

4

4

270R R10 1 integrated

circuit

ICL7107 U1 1

20K R8 1 TL431A U2 1

47K R7 1 Potentiometer 3296 1K VR1 1

100K R4 1 IC socket 40P U1 1

Monolithic

capacitors

101P C1 1 terminal 2P vertical type J2 1

104P C8 1 301-2P J1 1

474P C4 1 power line 2Psingle-end 1 1

CBB

capacitance

104P C2 1 PCB board 70.6*39mm 1 1

224P C5 1 light filter 1 1 1

Dacron

capacitan

ce

103P C3 1 outer skin 79*43mm 1 1

electrolytic

capacitor

10uF/25V C6

C7

2 screw M1.7*6 4 4

Production steps

Before welding please carefully read the following steps, some of the installed components must be the order, this may

lead to the production of unsuccessful!

1. welding two colored ring resistance (color ring color is red dark brown brown, the same colors of the two resistance)

2. Welding a colored ring resistance (green blue black red brown)

3. Welding a colored ring resistance (brown black black yellow and brown)

4. Welding five four-color ring resistance

R3 color is brown black brown golden

R4 color is brown black yellow gold

R7 color is yellow purple orange gold

R8 color is red, black and orange gold

5. Welding three diodes, three of the same model (with direction)

D1 D2 D3 model: 1N148

6. welding a Zener diode (directional)

ZD1 model: ST5V1

7. welding a color ring inductance (color ring color is red red red silver)

8. welding three monolithic capacitors

9. Deal with the IC socket like this:

10. Place the 1st row in the red box installation position (directional)

11. Welding the 1st header row, install the four digital control (with directions)

12. After welding finished four digital tube, cut off the excess pin digital

13. Welding on the 2nd row home (with directions)

14. Welding a transistor and a reference voltage regulator chips (with direction, and note to distinguish models)

Q1 model: C1815

U2 model: TL431A

15. Welding 2 CBB capacitors and two electrolytic capacitors (electrolytic capacitors have direction)

16. The welding a sampling resistor

17. The welding a potentiometer and a polyester capacitor (potentiometer directional)

18. welding power socket and input socket (both with directions)

19. Install the IC, plug in the power cord (with direction), short circuit decimal point selection joints.

20. Test Procedure:

1) Use DC 5V voltage (note polarity), digital display -.000 or .000 is normal

2) Adjust the VR1 potentiometer, so between 36 feet and 35 feet voltage is100mV

21. Locking four screws, finished produced.