Wow, that's confusing.
In that case, back to reply#13! 
... no extra parts required, except a separate power supply for the relay board.
dlloyd:
Wow, that's confusing.In that case, back to reply#13!
... no extra parts required, except a separate power supply for the relay board.
hehe i know 
I dont use arduino bord on it. just 5v power 
so eply#13 dont work i think.
Then it will work connected like this:
- Connect the relay board's VCC to your 5V supply (+5V)
- Connect the relay board's GND to the 5 volt supply's negative terminal.
- Leave the JD-VCC jumper installed.To test, touch IN1 to GND with a jumper wire. Relay1 will click and LED1 will turn ON.
That's all it takes for any or all relay inputs.
dlloyd:
Sure it does.Connect VCC to your 5V supply (+5V) and GND to the 5 volt supply's negative terminal.
Leave the JD-VCC jumper installed.
Touch IN1 to GND with a jumper wire. Relay1 will click and LED1 will turn ON.
That's all it takes for any or all relay inputs.
Yes it work. but the problem is that I have to use 5v (5v on IN) to turn on the relay.
Why? Because of the system is build to give out 5v to relay ( IN1 ,IN2 etc) and not GND
But the transistor work.
The problem with that is that when I put a jumper wire on base (Transistor) . so give it some power of things around i think. if I take on the wire. then the light on the relay going on. If I remove the jumper wire on the Base, then it working
If you look: - YouTube
Why? Because of the system is build to give out 5v to relay ( IN1 ,IN2 etc)
Well, your system will operate it in an inverted way. If this is not acceptable, or if using the NC-COM terminals to correct the problem is not acceptable, then you would need a different relay module.
For this one, you can change each channel to trigger on HIGH level. The only (potential) problem here is that it would not be opto-isolated as advertised (they haven't figured out how to do this yet).
Yes:) I can use just 6x 1 channel of this to: http://www.ebay.com/itm/5V-1-2-4-8-Channel-Relay-Board-Module-for-Arduino-Raspberry-Pi-ARM-AVR-DSP-PIC-/252051910091?var=&hash=item3aaf76edcb:m:mdbiogK3bG3MfWb_sjDpLvw
so I connect my 5v signal on vcc ( Signal ) and GND to GND ? If you know what I mean
Like this:
PS is wrong relay on this image 
The problem with that is that when I put a jumper wire on base (Transistor) . so give it some power of things around i think. if I take on the wire. then the light on the relay going on. If I remove the jumper wire on the Base, then it working
Try this:
dlloyd:
Try this:
I try it:)
Was much better. However relay vibrate slightly still You hear the power in it. and the led is light.
I see from the video you're testing with your fingers on the control wire when disconnected.
So try changing the 10K to 1K.
What is the part# of the transistor?
dlloyd:
Try changing the 10K to 1K. What is the part# of the transistor?
2n3904 b331
Try 1k now:)
Is working! 
Thx m8
if I take my finger on Base. then the light coming on xD but know it working:) What happen if i change 1k to 330 ?
EDIT: tested with a long cable now (1-2m), and it the same 
Yes, you can go with 330Ω for a pulldown resistor.
With the 2N3904, you could change the 330Ω base resistor to 150Ω or 180Ω or 200Ω or 220Ω.
This will ensure full saturation (turn on) because the gain of the 2N3904 will be significantly lower when driving the relay coil @ 80mA.
dlloyd:
Yes, you can go with 330Ω for a pulldown resistor.With the 2N3904, you could change the 330Ω base resistor to 150Ω or 180Ω or 200Ω or 220Ω.
This will ensure full saturation (turn on) because the gain of the 2N3904 will be significantly lower when driving the relay coil @ 80mA.
Can i Use 100Ω Dont have 150Ω or 180Ω or 200Ω or 220Ω.
I would just leave it at 330Ω if everything works OK.
Going to 100Ω would draw too much current (40+mA) load for whatever you're using for the control signal. If the transistor doesn't perform well, a better alternative is the PN2222A and use existing resistors.
