Features:
This watch has fast response speed and high accuracy;
The display is clear, the reading is intuitive, and the stability is good;
The circuit design is advanced and reasonable, with strong anti-interference ability and can effectively suppress high-frequency interference;
The kit features good materials, good workmanship, beautiful appearance, long service life, and easy installation and use.
A voltmeter suitable for DIY enthusiasts to weld and assemble.
Parameter introduction:
Working voltage: DC5V
Working current: 35mA
Measurement accuracy: Can be calibrated to obtain higher accuracy, no parameters yet.
Measuring range: divided into 3 levels:
0-2V range for measuring small voltages
0-20V range, measuring medium and low voltage
0-200V range, measuring higher voltage.
PCB size: 70.6*39mm
Meter head installation opening size: 77*40mm
Display window size: 51*24mm
Display color: red
Tools required for production (not included): multimeter, soldering iron, nozzle pliers
Range selection method: There are solder joints on the board for gear selection.
When the two points of the 0-2V range are welded together and the RX welding resistor resistance is 1K, the measurement range is 0-2V;
When two points in the 0-20V range are welded together and the RX welding resistor resistance is 100K, the measurement range is 0-20V;
When two points of the 0-200V range are welded together and the RX welding resistor resistance is 1M, the measurement range is 0-200V;
Over-range display: the first digit displays 1 or -1
In the kit, RX comes in two types: 100K and 1M. You can choose welding according to your own measurement range.
This voltmeter can also be changed into an ammeter. How to change the ammeter: reserve a 2W 0.1 ohm high-precision resistor welding position on the board, weld this resistor, and then RX does not need to be welded, so it is a 0-2A ammeter.
The function of measuring and calibrating the potentiometer: input a voltage, and then adjust the potentiometer. The value displayed on the meter head is the same as the measured value of the multimeter.
Product List:
Set one:
1X Parts Kit
Parts include:
PCB board x1
1N4148x3
5.1V Zener diode x1
100 ohm resistor x1
270 ohm resistor x1
2K resistor x2
20K resistor x 1
47K resistor x1
56K resistor x 1
100K resistor x2
1M resistor x1
2.2MH inductor x1
104 monolithic capacitor x2
101 monolithic capacitor x2
224 monolithic capacitor x1
474 monolithic capacitor x1
10UF25V electrolytic capacitor x2
C1815x1
TL431x1
3296-202 potentiometer x2
XH2.54-2P straight seat x1
XH2.54-2P line x1
KF301-2 seats x1
40P chip holder x1
LT7107 chip x1
0.56 bit common yang digital tube x4
Case x1
M2*6 self-tapping screws x4
Set two:
1X voltmeter
1X line
