This is a 8 channel relay box that the input connect to a controller allow it to control large loads like home appliances.
I'm using this relay box for a snooker centre to control snooker table lamps. The lamps consists of 6 pieces 20W and 3 pieces 10W fluorescent lamps, total of power consumption is 150W per table.
Material:
PVC BOX
DIN Rail
2A 12 DC adapter
Omron MKS2P relay x 8
On/Off Swith x8
Relay Socket
ULN2803 IC
18pin Swiss machined socket
PCB with copper hole
Pin Header connector
Wire/IDE cable or Floopy drive cable
Key Switch
Finish product shows 10 on/off switch. I'm using only 8 of them, 2 of them reserved for future use.
Block diagram
Connection diagram
The relay is control by an ULN2803 line driver. As shown in figure below, I'm using Swiss machined socket for the ULN2803 since the ULN2803 can generate heat & require more current on it especially on pin9 (Gnd), but I agree the best thing is a solid soldered connection.
To turn on relay manually, on/off switch must connect between the output of ULN2803 and relay coil. See figure below on how to adding on/off switch and indicator to the circuit. This is very useful when the controller is not able to control the relays while still want to turn on the lights.
Figure below shows 10 units on/off switch fixed to the cover, I'm using only 8 of them, the other two is reserved for future use. A key switch is use to prevent manually turn on the relay.
More pictures and instruction available at
http://ediy.com.my/index.php/projects/item/43-8-channel-relay-box
I'm using this relay box for a snooker centre to control snooker table lamps. The lamps consists of 6 pieces 20W and 3 pieces 10W fluorescent lamps, total of power consumption is 150W per table.
Material:
PVC BOX
DIN Rail
2A 12 DC adapter
Omron MKS2P relay x 8
On/Off Swith x8
Relay Socket
ULN2803 IC
18pin Swiss machined socket
PCB with copper hole
Pin Header connector
Wire/IDE cable or Floopy drive cable
Key Switch
Finish product shows 10 on/off switch. I'm using only 8 of them, 2 of them reserved for future use.
Block diagram
Connection diagram
The relay is control by an ULN2803 line driver. As shown in figure below, I'm using Swiss machined socket for the ULN2803 since the ULN2803 can generate heat & require more current on it especially on pin9 (Gnd), but I agree the best thing is a solid soldered connection.
To turn on relay manually, on/off switch must connect between the output of ULN2803 and relay coil. See figure below on how to adding on/off switch and indicator to the circuit. This is very useful when the controller is not able to control the relays while still want to turn on the lights.
Figure below shows 10 units on/off switch fixed to the cover, I'm using only 8 of them, the other two is reserved for future use. A key switch is use to prevent manually turn on the relay.
More pictures and instruction available at
http://ediy.com.my/index.php/projects/item/43-8-channel-relay-box