Hi,
I'm tired of trying search about this problem, and I didn't find any topic help me,
I made a circuit as in this image with keeping terminal 3 disconnected,
the problem is the lamp is flickering once I put/remove the plug in/from the power socket, as in this video
I tried with two another triac bt136&bt138, but the same problem occured, any one can help me?
Thank you in advance.
Hi,
I think we need to see your complete ciruit.
OPs image;
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you post a picture of your project so we can see your component layout?
Why is terminal 3 open circuit?
Thanks.. Tom... 
You will have enough current leaking trough the TRIAC to have the LED's power supply trying to power on.
Your circuit will probably not behave like that with an incandescent LED.
LED-bulbs and TRIAC control don't really mix.
If you are only planning to turn on/off the LED-lamp, it might work if you place a snubber across the lamp. A 100 ohm, 2 watt resistor in series with a 100nF/400V X-rated capacitor.
// Per.
Hi,
Zapro:
Your circuit will probably not behave like that with an incandescent LED.LED-bulbs and TRIAC control don't really mix.
If you are only planning to turn on/off the LED-lamp, it might work if you place a snubber across the lamp. A 100 ohm, 2 watt resistor in series with a 100nF/400V X-rated capacitor.
// Per.
Good catch.
If you want to phase control an LED lamp you need to purchase a "Dimmable" LED lamp.
The regular LED mains powered lamps have a capacitive dropper and switch mode power supply inside them, each of those features does not like phase controlled power supply.
Tom...
TomGeorge:
Why is terminal 3 open circuit?
I tried to to control AC by connecting the triac with arduino using moc3021, but the problem occurs whether I connect the triac with moc3021 or disconnect it.
Zapro:
LED-bulbs and TRIAC control don't really mix.
I don't know if it's LED bulb, but I think it's filament bulb, I will be sure when I back to home, thank you for this note.
Hi,
This looks like a LED globe to me;
Tom...
the trigger occurs regardless the type of device, I tried to connect Samsung charger that connected to phone, the same problem occurred
abdallahbadarneh:
the trigger occurs regardless the type of device, I tried to connect Samsung charger that connected to phone, the same problem occurred
Yes, because the "charger" (actually a power supply) works on the SAME principle as the LED-bulb. It's a switchmode power supply. You cannot readily switch something like that with a TRIAC as i wrote in an earlier post.
Try with an INCANDESCENT BULB.
// Per.