This is a 4 Channel Relay Board Which is Controlled by ULN2003 Based IC Driver Triggered by 8051, Arduino, PIC, Raspberry PI Digital Pins.
A relay is an electromechanical switch which is activated by an electric current. A single relay board arrangement contains driver circuit, power supply circuit and isolation circuit. A relay is assembled with that circuit. The driver circuit contains transistors for switching operations. The transistor is use for switching the relay. An isolation circuit prevents reverse voltage from the relay which protects the controller and transistor from damage. The input pulse for switching the transistor is given from the microcontroller unit. It is used for switching of a four devices.
• Input voltage: 12VDC
• Driver unit: ULN2003A
• Isolation unit: In4007
• Fast switching
• Motor forward and reverse operation
Compatible With Arduino, Raspberry, 8051, PIC.
• Ac load Switching applications
• Dc load Switching applications
• Robotic applications