Did you supply the self made shield from the Arduno, or did you connect it to its own supply and connect the GNDs of both supplies ?
And schematic is needed.What is the load?
You made a mistake linking the image.This is the image:You also made another mistake,The schematics tell about a resistor of 10 K (brown black orange).The photo shows brown black red; 1 K.Which of those is correct ?Did you answer to my earlier post, telling that you are powering the Arduino from the shield, or is that not what you meant ?
What transistors are you using ?
These relay circuits are extremely sensitive to lead length and lead "dress".Optocouplers are only relevant if the power supply to the relays themselves is completely isolated from the Arduino and its power supply, neither Vcc nor ground being connected from one to the other. Note also that you must have a supply capacitor (say, 220µF) on the relay board so that the length of connections between that capacitor, the switching transistor and the relay are as short as possible.
If you are having trouble with a relay then an SCR is even more tricky.Write a simple sketch to test the relays, if that does not work then post your code.