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250W 50V DC-DC Adjustable Boost Step Up Constant Voltage Constant Current Power Module

The module adopts imported power management chip design, which has high reliability, small inrush current and small volume (length 70MM*width 36MM*high 13MM) efficiency up to 96% , power MAX 2 50W . At the same time, the aluminum substrate design is easy to install, and the back of the board can be directly flat on the metal casing to dissipate heat. Reduce equipment space.

Application range:
1. DIY a regulated power supply, input 12V, the output can be adjusted 12-50V.
2. Power your electronic device and set the output value according to your system voltage.
3. as a car power supply, power your laptop, PDA or a variety of digital products.
4. DIY a high-power notebook mobile power: with a large-capacity 12V lithium battery pack, let your books go where to shine.
5. solar panel voltage regulator.
6. Charge the battery, lithium battery, etc.
7. drive high-power LED lights.


Module nature:
non-isolated boost module (BOOST)
Input voltage: DC8.5V-48V
Input current: 10A (MAX) exceeds 8A or the module temperature exceeds 60 degrees, please strengthen the heat dissipation
Static working current: 10mA (12V liters 20V, the higher the output voltage, the quiescent current will increase)
Output voltage: 10-50V continuously adjustable (default delivery) boost module, suitable for application input voltage Less than the output voltage can not be stepped down
Output current: 10 A MAX More than 6A, please strengthen the heat dissipation (related to the input and output voltage difference, the larger the differential pressure, the smaller the output current)
Constant current range: 0.2-8A
Output power: = input voltage * 10A, such as: input 12V * 5A = 60W, input 24V * 5A = 120W, input 36V * 5A = 180W, input 48V * 5A = 240W,                 
Working temperature: -40~+85 degrees (enhance heat dissipation when the ambient temperature is too high)
Working frequency: 150KHz
Conversion efficiency: MAX 96% (efficiency related to input, output voltage, current, voltage difference)
Overcurrent protection: Yes (input over 13A, automatically reduce the output voltage, there is a range of errors.)
Input reverse connection protection: Yes, (less than 5A, if you need more reverse current, please input the diode in the input)
Output anti-backflow protection: None; if used for charging or load self-powered, you need to add a 2-pole tube.
Installation method: 4 3mm screw holes
Wiring method: wiring output
Module size: length 70mm width 36mm height 13mm
Module single weight: about 50 grams
Output voltage / current regulation method:
        1. Adjust the CV potentiometer and set the output voltage to the voltage you need according to your battery or LED. For example, 10 strings of LED voltage are adjusted to 37V.
        2. Adjust the CC potentiometer clockwise about 30 times, set the output current to the minimum, connect the LED, and adjust the CC potentiometer to the current you need. For battery charging, after the battery is discharged, it will be connected to the output and adjust CC to the current you need. (Be sure to use the battery after charging to charge, because the battery is left in the battery.) More, the charging current is smaller.)

Please do not adjust the current by short circuit. The circuit structure of the boost module cannot be adjusted by short circuit.


9450 Enhanced Self-tightened CW CCW Propeller For DJI Motors

Self-locking tension enhanced propeller(CW and CCW) for DJI multicopter
You can use the propeller easily
It is self-tightened. So you don't worry to lost it when your drones are flying
The design is more reasonable
Suitable for DJI Phantom 12 2 vision 2 vision + compatible
Not official, please well noted

Materal Plastic
Size 9.4'' x 5.0'' (Approx. )
Color Black
Net Weight 24g
Package Size 270mm78mm19mm package i
Package Weight 26g

per pair price is 350/-

Passive Speaker Buzzer Module Sensor

Working voltage:3.5-5.5V
Working current:<25mA
PCB Dimension:18.5mm x 15mm(LxW)
Passive Buzzer Module Feature:

No oscillation source, need square wave (frequency 2K-5K ) to drive.
Sound frequency control, you can make a "do re mi fa sol la si" effect.
For ARDUINO reference source programme:

int buzzer=8;// Set the control the buzzer digital IO pin
void setup()
pinMode(buzzer,OUTPUT);// Setting the digital IO pin mode , OUTPUT is Wen out
void loop()
unsigned char i,j;// Define the variable
for(i=0;i<80;i++)// Wen a frequency sound
digitalWrite(buzzer,HIGH);// Sound
delay(1);//delay 1ms
digitalWrite(buzzer,LOW);//Not sound
delay(1);// delay 1ms
for(i=0;i<100;i++)// Wen out another frequency sound
digitalWrite(buzzer,HIGH);// Sound
delay(2);//delay 2ms
digitalWrite(buzzer,LOW);// Not sound
delay(2);//delay 2ms
After downloading the program, the buzzer experiments are finish.

Package Included:

1 X Passive Speaker Buzzer Module

CD40106 DIP14 Hex Schmitt-Trigger Inverters NOT Gate


0.01uF Package Size 1206(5 Pcs Packet) SMD Capcitor

Name: SMD Capacitor
Quality Grade: Industrial
Manufacture Part no: 12065A100DAT2A
Manufacture: AVX
Package Size: 1206

Datasheet Link:

6 Switches Power Distribution Unit Board PDU for Labs








EWALL- 2 Channel Relay Module 5V TTL 220V 10A

This relay module is completely designed and manufactured by EWALL. 

The 2 channel 5V relay module provides 2 optically isolated inputs that accept a wide range of voltage, including the 3VDC and 5VDC signals available on the Arduino. This is a great way to switch on or off AC or DC loads using your Arduino.

The relays are single-pole-double-throw (SPDT) and are rated for 10A @ 250VAC. The ground for the relay coils is separate from the ground for the input signals. This, along with the optical isolation, provides a total galvanic isolation between the input and output. The two grounds could be joined together if desired with the included jumper.

The relay coils run on 5VDC, and the module has screw-terminal blocks for sturdy and reusable attachments for the external load. The signal and power inputs run through the male single-row header.

Serial Communication Module 433MHz HC-12 (hc12) SI4463 Wireless SCM


Supply voltage: 3.2V~5.5V. (If the module you want to work long hours in the emission state, it is recommended that when the supply voltage exceeds 4.5V threaded a 1N4007 diode to prevent module built-in LDO heated)
Default address range (open field test): About 600m (maximum communication distance adjustable reach 1000m, the baud rate is 5000bps)
Default idle current: 16MA (In different working modes operating current is different)
Module dimensions: 27.8 x 14.4 x 4mm
Operating frequency range: 433.4-473.0MHz, up to 100 channels of communication
The maximum transmit power: 100mW (settable)
Module support software upgrade
Default factory settings: Mode FU3, baud rate is 9600bps, communication channels CH001 (433.4M)

AT command set:
Module parameters, AT command set
AT command is used to set the parameters of the function module and switching modules need to exit the setting mode after setting to take effect. Meanwhile, modify the parameters and functions, power-down is not lost.
Enter the command mode:

The first entry mode - normal use (has the power) in the first 5-pin "SET" is set low;
The second mode of entry - power, 5th pin "SET" again first set low on power.
Both methods can make the module into AT command mode, release ("SET" pin is not connected low) to exit command mode. After the exit command mode, if you change the module function, the function will be cut to the appropriate state.
The second way is fixed in serial format 9600, N, 1 into the AT.

1. AT
Test instructions
Example: Send module commands "AT", the module returns "OK".
2. AT + Bxxxx
Change the serial port baud rate command. You can set the baud rate is 1200bps, 2400bps, 4800bps, 9600bps, 19200bps, 38400bps, 57600bps and 115200bps. The factory default is 9600bps.
Example: Set the module serial port baud rate is 19200bps, please send module command "AT + B19200", the module returns
"OK + B19200".
3. AT + Cxxx
Change the wireless communication channel, selectable from 001 to 127 (more than 100 radio channels after the communication distance not guaranteed). The default value is 001 radio channels, operating frequency is 433.4MHz. Step channel is 400KHz, the operating frequency of the channel 100 is 473.0 MHz.
Set module to channel 21, please send module command "AT + C021", the module returns "OK + C021".
After exiting the command mode, the module in the first 21 channels, operating frequency is 441.4 MHz.
Note: Because the wireless receiver module sensitivity HC-12 is relatively high, the baud rate is greater than when air 58000 bps, 5 must be shifted to the adjacent channel use. When the air baud rate is not greater than 58000 bps, if the short distance (10 meters) communication, but also need to stagger five adjacent channel use.
4. AT + FUx

Change the module serial pass-through mode, there FU1, FU2 and FU3 three modes. Module default mode is FU3, two serial pass-through mode module must be set to the same communication. See detailed above, "wireless serial pass-through" part.
Example: Send module commands "AT + FU1", the module returns "AT + OK".
5. AT + Px

The default setting is 8, maximum transmit power, communication distances. Transmit power level is set to 1, the minimum transmission power. In general, the transmission power of each drop 6dB, communication distance will be reduced by half.
Example: Send module commands "AT + P 5", the module returns "OK + P5". After exiting the command mode, the module transmit power is +11 dBm.