analogmosfetpower electronicsswitchingtriac
Triac BT 136 not working with load connected to MT1 terminal..
but working with load in MT2 Terminal.
Please see the below connection diagram in working and non working cases.
If its bidirectional device(like a mecanical switch or relay), when load connected in MT1 or MT2 terminal it should work..
The relay draws more current than that module can supply. If you keep doing such tests you may damage the receiver!
If you read the SC2272-M4 datasheet, you'll see it can supply a maximum current of 3 mA. That relay needs 89 mA at a 55 ohms coil resistance. So the load current is 5 / 55 = 0.09 A = 90 mA. Now, the minimum hFE of the transistor should be (0.09 / 0.003) x 5 = 150. The resistor between receiver and transistor base should be 0.2 x 55 x 150 = 1650 ohms. Choose 1.8 k. Calculations made on http://pcbheaven.com/wikipages/Transistor_Circuits/
Due to the very low available current from receiver output pin, a high hFE transistor is required. 2N2222 should work (its maximum hFE is 300).
Use a (transistor) driver. Something like:
Here's an invaluable reference which indicates that your load's on the wrong side of the TRIAC and your gate resistance is way too high.
Best Answer
It works, but in both cases the Gate current must be switched relative to MT1.