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Newbie help with relay card

towijo

Feb 16, 2013
5
Joined
Feb 16, 2013
Messages
5
Hello!

I want to use a relaycard to control a 12VDC/180mA device using a 5VDC/20mA signal wich i think is pretty basic stuff :) but im getting kindof confused on how to connect things.

The relay card im using is B197 - Relay card 12 V/DC (Kemi electronics)
datasheet: http://www.kemo-electronic.de/product_info_pdf.php?products_id=334

It has three input pins: "MINUS", "IN", and "PLUS". and specifies the following:
* Between "MINUS" and "PLUS": 12 VDC
* Between "IN" and "PLUS": 3 to 12 VDC > 5mA

and it has a relaycontact with max 30VDC/3A

So Im going to tell you what i think and then you can correct me :)

Step 1: Connect a 12 VDC powersource to "PLUS" and "MINUS" which will be used to supply "operating power".

Step 2: Connect my weak output signal between "IN" and "MINUS" to be able to control the switch

Step 3: connect the device curcuit (which also is powered by the 12 VCD powersource) through the relaycontact

Would this be correct?

My main concern is if the relaycontact is acting as a powersource or just a "dumb" curcuit switch?

Thanks in advanced for helping out!

Cheers!
Towijo
 

Harald Kapp

Moderator
Moderator
Nov 17, 2011
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* Between "IN" and "PLUS": 3 to 12 VDC > 5mA
That should read:
* Between "IN" and "MINUS": 3 to 12 VDC > 5mA
Step 1: O:K.
Step 2: O:K:
Step 3: O:K:

The relay contact is just a switch, no power source of its own. You need to supply external power for the load circuit
 

towijo

Feb 16, 2013
5
Joined
Feb 16, 2013
Messages
5
Ok thanks for eliminating my doubt! and yes, controlling signal between "minus" and "in".
 
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