• How to Place an Order

  • Store Pick Up

  • Request for Quotation/ International Sourcing

  • Order Status

Choose Your Size Quick view

Reference: RBD-984

Heat Shrink Tube

Heat Shrink Tubing 2:1, Eventronic Electrical Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit (1 pcs) Please Choose Size Below

Price BDT 2
More
In-Stock
Jumper Wire Single Medium Quick view

Reference: RBD-1354

Jumper Wire Single Medium

Length: 8.5 inches (Medium) Material: Copper Plated.EachPin Spacing: 2.54mm.Color: Colorfulcompatible with 2.54mm mil spacing pin headers.It can be used for PCB project, pc motherboard, etc.Allow you to plug and unplug easily for prototyping.Package Contents: 1 x Jumper Wire You will get only one pcs.

Price BDT 3
More
In-Stock
470 Ohm 1/4w - Pack of 5 Quick view

Reference: RBD-245

Kiloohm (KΩ) 1/4w Resistors - Pack of 5

Choose your desire Resistor value from below: 

Price BDT 5
More
In Stock
Jumper wire 40 Pcs Quick view

Reference: RBD-31

Jumper Wire 40 Pcs Set

3 Types Available 1. Male to Male  2. Male to Female 3. Female-Female

Price BDT 90
More
In Stock
Buzzer Quick view

Reference: RBD-766

Ohm (Ω) 1/4w Resistors - Pack of 5

Choose your desire Resistor value from below: 

Price BDT 5
More
In-Stock
Push Button Switch Quick view

Reference: RBD-761

Push Button Switch

Push Button Switch

Price BDT 5
More
In-Stock
5 mm Green LED (Pack of 5) Quick view

Reference: RBD-768

5 mm Red LED (Pack of 5)

5 mm Red LED (Pack of 5)

Price BDT 5
More
In-Stock
Buzzer Quick view

Reference: RBD-758

BC547 NPN Transistor

BC547 NPN Transistor

Price BDT 2
More
In-Stock
On sale! Arduino Uno R3 (Made in Italy) Quick view

Reference: RBD-94

Arduino Uno R3

Arduino UNO in Bangladesh The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller.

Price BDT 609
More
In Stock
Buzzer Quick view

Reference: RBD-755

5 mm Green LED (Pack of 5)

5 mm Green LED (Pack of 5)

Price BDT 5
More
In-Stock
All best sellers

Solar Charger Controller Adjustable Step-Up / Down Automatic Power Module

RBD-1564

ZK-SJ4 is a DC adjustable constant voltage constant current step down/up power supply module.Adjustable stable output voltage and current.Set output current to meet the demand.It can be used as ordinary buck power supply module, charger and LED constant current driver.Simple and efficient, practical.Support solar charging.

BDT 559
rating Read the review
Average rating: 5/5 - Number of reviews: 1
Quantity
In-Stock

  • Store Pickup Available! Store Pickup Available!
  • Free Ship Over 5000 BDT Free Ship Over 5000 BDT
  • Quality Product Quality Product
  • No Warranty No Warranty
  • No Replacement No Replacement
Description

1.Description:

 

ZK-SJ4 is a DC adjustable constant voltage constant current step down/up power supply module.Adjustable stable output voltage and current.Set output current to meet the demand.It can be used as ordinary buck power supply module, charger and LED constant current driver.Simple and efficient, practical.Support solar charging.

 

2.Features:

 

1>.High voltage resistant terminal.

2>.Support solar charging.

3>.Support undervoltage protection.

4>.Support short circuit protection.

5>.Support automatic buck/boost voltage.

6>.Support solar charging.

7>.Support anti-backflow Protection

8>.Support charging function.

9>.Support working status indicator.

10>.High current, low heat.

 

3.Parameters:

 

1>.Product Name:ZK-SJ4 4A Step Down/Up Power Supply Module

2>.Product Number:ZK-SJ4

3>.Working Voltage:DC 4.8V-30V

4>.Output Voltage:DC 0.5V-30V

5>.Output Current:4A(4A need heat sink;3A is stable for long time)

6>.Output Power:60W(60W need heat sink;35W is for 3A)

7>.Conversion efficiency:About 94%

8>.Working current:30mA

9>.Undervoltage Protection:Yes(Self-recovery)

10>.Anti-backflow Protection:Yes

11>.Short Protection:Yes

12>.Work frequency:180KHz

13>.Working Temperature range:-20℃~85℃

14>.Working Humidity range:0%-95%RH

15>.Size:68*37*22mm

16>.Heat sink size:48*16*10mm

 

4.Potentiometer/LED introduction:

 

1>.CV Potentiometer:Adjust output voltage.Increase the output voltage when rotating clockwise.

2>.CC Potentiometer:Adjust output current.Increase the output current when rotating clockwise.

3>.CC LED:Red LED.Constant current output indicator.It enters the constant current state when the load current reaches the set current and CC constant current indicator turns ON.

4>.FL LED:Green LED.Charged fully indicator.When battery is charged fully.It will turn ON.It will turn ON if output current is less than 0.2A when the Set Current is 2A(about 10%).

5>.CH LED:Blue LED.Charging indicator.It will turn ON when charging.

 

5.Using Steps:

 

1>.As a ordinary step down power module:

1.1>.Connect right input voltage at input terminal;

1.2>.Adjust CV constant voltage potentiometer to set output voltage according to require.

1.3>.Rotate CC potentiometer counterclockwise more than 10 turns at first.

1.4>.Test Output short circuit current by multimeter at 10A or 20A(Connect two Test Probes to output terminal on module)

1.5>.Rotate CC constant current potentiometer clockwise to set output current according to require overcurrent protection value.

1.6>.Test and using(E.g:Module’s maximum output current is 2A if display 2A on multimeter.Red LED indicator will turn on if output reach to 2A.Otherwise LED is OFF.)

1.7>.The output voltage will decrease due to the current sampling resistor at the output. The higher the current, the more the voltage is reduced.

2>.As a charger:

2.1>.Tops:Power module can not be used as charger module if it does not support constant current function.The voltage difference between the battery with insufficient voltage and the charger is very large.Causes excessive charging current even damage the battery.So it need keep charging in constant current mode to reaching a certain level.Then automatically switch back to constant voltage charging.

2.2>.Make sure floating charge voltage and charge current for battery.If the lithium battery’s parameter is 3.7V/2200mAh, then the float charge voltage is 4.2V, and the maximum charging current is 1C, which is 2200mA.

2.3>.Connect right input voltage at input terminal.(Note:Please don’t connect load during set parameter).

2.4>.Test output voltage by multimeter and adjust CC potentiometer to make sure output voltage reach to require floating charge voltage.(If charge a 3.7V lithium battery, adjust the output voltage to 4.2V)

2.5>.Rotate CC potentiometer counterclockwise more than 10 turns at first.

2.6>.Test Output short circuit current by multimeter at 10A or 20A(Connect two Test Probes to output terminal on module)

2.7>.Rotate CC constant current potentiometer clockwise to set output current according to require charge current value.

2.8>.Connect battery at output terminal and start to charging.

3>.As a high power LED constant current driver:

3.1>.Make sure LED working current and maximum working voltage.

3.2>.Connect right input voltage at input terminal.(Note:Please don’t connect load during set parameter).

3.3>.Test output voltage by multimeter at output terminal and adjust CV potentiometer to set output voltage to LED’s maximum working voltage.

3.4>.Rotate CC potentiometer counterclockwise more than 10 turns.

3.5>.Test Output short circuit current by multimeter at 10A or 20A(Connect two Test Probes to output terminal on module)

3.6>.Rotate CC constant current potentiometer clockwise to set output current according to require LED working current.

3.7>.Connect LED and test.

 

6.Note:

 

1>.Input undervoltage protection voltage is 4.2V.Module will self-recovery if input more than 4.2V.

2>.Please rotate the CV potentiometer counterclockwise more than 20 turns if there is no output voltage.

3>.It is a DC power module,So it can not connect to AC power.

4>.Please connect input before connect battery when use as charge and make sure output voltage is higher than battery voltage.

5>.’IN-’ and ‘OUT-’ can not be connect together,otherwise module can not support constant current output.

6>.Please make sure input power is more than load power.

7>.Please step down output power if module is hot.

8>.Please read use manual and description before use.

 

7.Application:

 

1>.Ordinary power supply;

2>.Battery charger;

3>.LED drive power;

4>.Instrument voltage display;

5>.Test meter;

6>.Circuit test;

7>.Power conversion.

 

8.Package:

 

1>.1pc ZK-SJ4 4A Step Down/Up Power Supply Module;

2>.1pc Heat Sink;

Product Details
RBD-1564
22 Items
প্রডাক্ট রিভিউ
rating
12/02/2021
রিফাত
টাইমলি ডেলিভারি পাইছি, প্রোডাক্ট প্যকেজিং ভালো ছিল।
30 other products in the same category:
Raspberry Pi Power Adapter... Quick view

Reference: RBD-110

Raspberry Pi Power Adapter Micro USB

Raspberry Pi fully compatible Power AdapterRaspberry Pi Power AdapterCompatible with:Raspberry Pi 3B+Raspberry Pi 3BRaspberry Pi ZeroRaspberry Pi Zero WRaspberry Pi 2BRaspberry PiUSB Type: Micro USB5V, 3A

Price BDT 390
More
In Stock
AC-DC 5V 700mA 3.5W... Quick view

Reference: RBD-1646

AC-DC 5V 700mA 3.5W Precision Buck Converter AC 220V to 5v DC Step Down Transformer Power Supply Module

AC-DC 5V 700mA 3.5W Precision Buck Converter AC 220V to 5v DC Step Down Transformer Power Supply Module

Price BDT 110
More
In-Stock
LM2596 DC-DC Step Down... Quick view

Reference: RBD-406

LM2596 DC-DC Step Down Adjustable Power Supply Module 3A Max Buck Converter

This is a very compact DC-DC step-down converter capable of supplying any voltage between 1.23 and 30 V from a higher voltage power supply (up to 35 V). 

Price BDT 95
More
In-stock
TP4056 Lithium Battery Charger Module With Protection Dual Functions Quick view

Reference: RBD-919

TP4056 Lithium Battery Charger Module With Protection Dual Functions

Micro USB 5V 1A 18650 TP4056 Lithium Battery Charger Module Charging Board With Protection Dual Functions

Price BDT 33
More
In-Stock
18650 Battery Holder 3S with wire Quick view

Reference: RBD-988

18650 Battery Holder 3S with wire

18650 Battery Holder 3S Compatible Battery: 18650 Cell: 3  

Price BDT 70
More
In-Stock
NVIDIA Jetson Nano 5V 4A DC... Quick view

Reference: RBD-1414

NVIDIA Jetson Nano 5V 4A DC Power Adapter

Since the micro USB interface of Jeston Nano only supports 2A current, when we use other devices with the Jeston Nano, such as fan, 7-inch display, camera, and so on. They will not work properly due to the insufficient power supply. We launch this 5V 4A DC power adapter, which can provide more current and more stable voltage for the Jetson Nano. It can...

Price BDT 690
More
In-Stock
DC-DC Step Up Boost... Quick view

Reference: RBD-1754

DC-DC Step Up Boost Converter Module MT3608

Step-up converter (output voltage higher than input). Supply voltage 2-28V, output max. 28V at max 2A.

Price BDT 80
More
In-Stock
XBee USB Adapter Quick view

Reference: RBD-282

XBee USB Adapter

Specifications: - 3.3V and 5V dual power output- 3.3V and 5V IO compatible- USB2.0 protocol- BitBang mode ready- Easily connected to PC via mini USB cable- Support XBee-setting with software X-CTU

Price BDT 1,200
More
In-Stock
DC 9V Charging Step Up... Quick view

Reference: RBD-1560

DC 9V Charging Step Up Booster Module for 18650 Lithium Battery UPS Voltage Converter Protection

It is a UPS uninterruptible power supply control board. DC 9V Support charging and discharging at the same time Large current Small size High efficiency Support short circuit protection

Price BDT 450
More
In-Stock
5V Fixed Output DC-DC Buck... Quick view

Reference: 1705

5V Fixed Output DC-DC Buck Step-down Converter

3A DC-DC Buck Step-down Converter Constant Voltage 5V  Fixed Output Module

Price BDT 150
More
In-Stock
Multifunctional 2 in 1 Type... Quick view

Reference: RBD-1749

Multifunctional 2 in 1 Type C USB Tester Color Screen

2 in 1 Type C USB Tester Color Screen LCD Digital Multimeter, USB C Voltage Current Voltmeter Amp Volt Ammeter Detector USB Cable Charger Indicator DC3.6-30V/0-5.1A

Price BDT 1,650
More
In-Stock
Raspberry Pi 4 Power... Quick view

Reference: RBD-1702

Raspberry Pi 4 Power Adapter Type C

Raspberry Pi 4 fully compatible Power AdapterRaspberry Pi Power AdapterCompatible with: Raspberry Pi 4BUSB Type: Type-C5V, 3A

Price BDT 390
More
In Stock
LM2596 DC DC Step Down Buck... Quick view

Reference: RBD-1524

LM2596 DC DC Step Down Buck Converter with Digital Tube Display

Module Model:LM2596 Buck Converter + Voltmeter Input Voltage: DC 4.0~40V ; Output Voltage: 1.25V~37V; Output Current: 2A(normal and stable), 3A Max Cutting Size: 66mm x 35mm Measure Range:4~40V (for measure accurately, please ensure that the input voltage is more than 4V) Ripple Frequency: About 150Khz; Ripple Peak: About 100mV; Voltage Meter Error: ±0.1V

Price BDT 249
More
In-Stock
USB DC 5V to DC 12V Step up Cable Module Converter Quick view

Reference: RBD-696

USB DC 5V to DC 12V Step up Cable Module Converter

USB DC 5V to DC 12V Step up Cable Module Converter

Price BDT 390
More
In-Stock
150W LDM Digital Electronic... Quick view

Reference: 1725

150W LDM Digital Electronic Load Discharge Capacity Tester USB Voltmeter Ammeter

150W LDM Digital Electronic Load Discharge Capacity Tester USB Voltmeter Ammeter Test range 150V 10A 150W, meeting the needs of most electronic enthusiasts

Price BDT 4,590
More
In-Stock
9-40V to 5V 3A Step Down... Quick view

Reference: RBD-1545

9-40V to 5V 3A Step Down Power Supply Buck Converter

9-40V to 5V 3A Step Down Power Supply Buck Converter Input: 9V-40V DC Output: 5V, 3A DC

Price BDT 350
More
In-Stock
Battery 9V Quick view

Reference: RBD-652

Battery 9V

Battery 9V

Price BDT 49
More
In-Stock
5V 4000mA AC/DC Power Adapter Quick view

Reference: RBD-1655

5V 4000mA AC/DC Power Adapter

5V 4000mA AC/DC Power Adapter Use it with Jetson Nano

Price BDT 750
More
In-Stock
TP4056 5V Mini USB Charger Module Quick view

Reference: RBD-388

TP4056 5V Mini USB Charger Module

TP4056 5V Mini USB Charger Module

Price BDT 30
More
Pre-Order
5V 2A Large Current... Quick view

Reference: 1723

5V 2A Large Current Wireless Charger Module Wireless Power Supply Module

5V 2A Large Current Wireless Charger Module Wireless Power Supply Module Transmitter Receiver Charging Coil Module

Price BDT 890
More
In-Stock
Breadboard Power Supply... Quick view

Reference: RBD-1697

Brand: DFRobot

Breadboard Power Supply 5V/3.3V

This is a very simple board that takes a 6-12V input voltage and outputs a selectable 5V or 3.3V regulated voltage. All headers are 0.1" pitch for simple insertion into a breadboard. It can be either powered from 6-12 DC2.1 power jack or from USB power.  The maximum current it can provide is 500mA. 

Price BDT 450
More
There are not enough products in stock
XL4015 DC-DC Step Down Adjustable Power Supply Module 5A Max Quick view

Reference: RBD-395

XL4015 DC-DC Step Down Adjustable Power Supply Module 5A Max

 Specification: Input voltage range:4~38VDC(Note:input voltage not exceeding 38V) Output voltage range:1.25-36VDC adjustable Output current: 0-5A, recommended for use in 4.5A. Output power: 75W Working temperature: -40~+85 degrees Operating frequency: 180KHz Efficiency:96%(max) Short circuit protection: yes(limit current 8A).

Price BDT 190
More
In-Stock
WGP Mini UPS - Router + ONU... Quick view

Reference: RBD-1535

WGP Mini UPS - Router + ONU Backup Output 5V, 12V, 12V

WGP Mini UPS is a DC uninterruptible power supply which can store power; It can provide hours of operation during a power failure at a low price vs a traditional UPS. It is designed to provide emergency power backup to all kinds of DC power equipment such as routers, modems, set-top boxes, VOIP phone systems, surveillance systems, alarm systems, personal...

Price BDT 1,900
More
In-Stock
Breadboard Power Supply Module 3.3V 5V Quick view

Reference: RBD-549

Breadboard Power Supply Module 3.3V 5V

Details For plug-in test boards, the 3.3V and 5V power supplies have jumper to adjust the desired power. Supports 9V battery jacks, 6.5 - 12V input power adapter, or power supply.Access via USB via Mini USB cable is small space wasted experiment board.  

Price BDT 99
More
In-Stock
Raspberry Pi 4B/3B+/3B U100... Quick view

Reference: 1732

Raspberry Pi 4B/3B+/3B U100 UPS HAT Expansion Board with Cooling Fan

This U100 UPS is a raspberry pi ups hat with super cooling fan for all current models of the Raspberry Pi using a 40-pin header. It can provide output 5V/3A continuously and stably. U100 supports Type-C PD fast charge protocol; Support Huawei FCP, Samsung AFC, MTK PE+1.1/2.0 input fast charge protocol; You can apply for more power from the adapter to...

Price BDT 1,990
More
In-Stock
DC 12V Charging Step Up... Quick view

Reference: RBD-1559

DC 12V Charging Step Up Booster Module for 18650 Lithium Battery UPS Voltage Converter Protection

It is a UPS uninterruptible power supply control board. DC 12V Support charging and discharging at the same time Large current Small size High efficiency Support short circuit protection

Price BDT 450
More
In-Stock
12V DC Switching Power... Quick view

Reference: RBD-1653

12V DC Switching Power Supply Mean Well RS-50-12

12V DC Switching Power Supply Mean Well RS-50-12 Input Voltage: 88~264V/47~63HzOutput Voltage: 12V/4.2A DCOutput Power: 50W

Price BDT 1,999
More
In-Stock
Boost Module Quick view

Reference: RBD-730

DC-DC Boost Module

XL6009 DC-DC Booster

Price BDT 94
More
In-Stock
9V Battery to 2.1mm for Arduino Uno Quick view

Reference: RBD-732

9V Battery to 2.1mm for Arduino Uno

9V Battery to 2.1mm for Arduino Uno Connector 

Price BDT 20
More
In-Stock
B3 Pro Lipo Balance Charger Quick view

Reference: RBD-212

B3 Pro Lipo Balance Charger

B3 LIPO Battery Charger 7.4v 11.1v Li-polymer Lipo Battery Charger 2s and 3s Cells for RC LiPo Battery Brand: Build Power/ IMAX (Clone) As per stock

Price BDT 499
More
In-Stock
Customers who bought this product also bought:
IMAX B6-AC Charger/Discharger 1-6 Cells Dual Power 80W (GENUINE) Quick view

Reference: RBD-215

IMAX B6-AC Charger/Discharger 1-6 Cells Dual Power 80W

Charge at home on 110/240v or in the field on 12v. The B6-AC handles both! The IMAX B6-AC is a rock solid charger thats able to charge, balance and discharge Lion, LiPo, LiFe (A123), NiCd and NiMH batteries. (Clone) Clone Variant

Price BDT 2,495
More
In-Stock
T Connector Male-Female Pair Quick view

Reference: RBD-571

T Connector Male-Female Pair

These are generic connectors similar to the popularDeans Ultra Plug connectors. They are sold as matching male-female pairs and have a current rating of 50 A. They are the smallest high-current connectors we know of, and they are great for projects that involve bigger motors and controllers, such as our Simple Motor Controllers and high-power motor drivers.

Price BDT 20
More
In Stock

NVIDIA Jetson Nano... Quick view

Reference: RBD-1373

NVIDIA Jetson Nano Developer Kit-B01

  The power of modern AI is now available for makers, learners, and embedded developers everywhere. NVIDIA® Jetson Nano™ Developer Kit is a small, powerful computer that lets you run multiple neural networks in parallel for applications like image classification, object detection, segmentation, and speech processing. All in an easy-to-use platform that...

Price BDT 14,900
More
Pre-Order

3650 Brushless Motor 3930KV + 60A Waterproof BEAST Series ESC Quick view

Reference: RBD-309

3650 Brushless Motor 3930KV + 60A Waterproof BEAST Series ESC

3650 1/10 Scale Brushless Motor 3930KV + 60A Waterproof BEAST Series ESC Motor Feature:4 poles 12 slot Hi-torque motor designCNC machined 6061 T6 windings maxinmizes efficiencyHigh RPM ABEC5 oversize bearingsUniversal fit, fit all 1/10 brushless cars-multi-mounting system for M3 screwsPrecision balanced rotor,smoothness for best reliability and maximum RPM

Price BDT 8,000
More
Pre-Order
Wire Cutter Mini Quick view

Reference: RBD-1170

Wire Cutter Mini

The Xuron 170-II is the original Xuron Micro-Shear® Flush Cutter.  Note: Cutter brand & shape may vary slightly from image as our stock rotates.

Price BDT 199
More
In-Stock
Choose Your Size Quick view

Reference: RBD-984

Heat Shrink Tube

Heat Shrink Tubing 2:1, Eventronic Electrical Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit (1 pcs) Please Choose Size Below

Price BDT 2
More
In-Stock
On sale! Product Description Quick view

Reference: RBD-555

Current Sensor ACS712-30A

Product Description 1. Current sensor chip: ACS712ELC-30A. 2. Pin 5V power supply, on-board power light. 3. The module can be measured plus or minus 30A current, Corresponding analog output of 66 mV / A. 4. No test current through, the output voltage is VCC / 2. 5. PCB size: 31 (mm) x13 (mm). 

Price BDT 219
More
In-Stock
18650 Battery Holder – 1 Cell Quick view

Reference: RBD-989

18650 Battery Holder – 1 Cell

18650 Battery Holder – 1 Cell

Price BDT 35
More
In-Stock

Follow us on Facebook