8-Channel Relay Interface Board


Introduction: 8-Channel Relay Interface Board

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This project is a general purpose 8 Channel Relay Board.

Step 1: Description

8 Channel Relay Board is a
simple and convenient way to interface 8 relays for switching application in your project. Input voltage level support TTL as well as CMOS. Easy interface with Micro controllers based projects and analog circuits. but in this bord is old . but PCB of new version of 8 channel relay module. with handle AC supply directly for home automation. this module are work same as our home distribution panel board.

Step 2: Specifications:

Input AC supply for switching application like Fan, Motor, etc.

Input supply 12 VDC @ 336 mA

Output eight SPDT relay

Relay specification 5 A @ 230 VAC

Trigger level 2 ~ 15 VDC

Header connector for connecting power and trigger voltage

LED on each channel indicates relay status

Screw terminal connector for easy relay output and aux power connection

Four mounting holes of 3.2 mm each

Step 3: Schematic

here Schematic is old Module in this schematic AC supply not edit


Here PCB layout of new version with AC supply handling directly thorough output terminals .

Step 5: Parts List

this parts list of old version .



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    Thanks for posting the original page. We also have other useful projects here:


    Its amazing for me i find many relay interfacing circuits but here ac supply added same circuit no need joint ects

    pls send the pdf file to my email muhdzaim.136@gmail.com

    pcb dosyası

    cok guzel dosyalarıatarmıısnız

    very nice work ...

    Plz send me pdf in my inbox...