simple triac on/off switch for 2X250 W bulbs

[aliyesami]

hi I want to control two 250 W bulbs with MCU and Triac . I found a posting here refering to this document https://www.littelfuse.com/data/en/Application_Notes/an1003.pdf

I want to use circuit in fig AN1003.22 , can you please confirm :

1- will this circuit work for what iam trying to do ?
2- does this circuit have a snubber part in it ?
3- why this circuit is not using DIAC ?

and one general question

is there any chip available with built in triac - snubber circuit and opto isolator in one package ?

thanks
Sami

Added after 18 minutes:

I also found this circuit , is this one better than fhe first I posted earlier?

I guess I can replace the variable resistor with n opto isolator for on/off function?

**broken link removed**

Added after 33 minutes:

I think this circuit is the one i am looking for . . can you please confirm ?

https://www.electronics-lab.com/projects/misc/022/index.html

 

[IanP]

Same thing, well - almost, as the circuit from your last link, but the difference is that the optocoupler controls the triac at zero-crossing ..

If you can, replace MOC3021 (non-zero or random-phase crossing) with MOC3041 or MOC3042 (zero-crossing) ..

If you want to read about zero-crossing jump to:
https://en.wikipedia.org/wiki/Zero_cross_circuit
or
https://www.fairchildsemi.com/an/AN/AN-3004.pdf


Rgds,
IanP

 

[aliyesami]

Thanks Ian !

whats the max output load this circuit can handle ?
where can i find these resistors with E ? i looked up digikey and jameco they dont have them.
the TRIAC name i cant read properly can you please type it here?

thanks

Added after 4 minutes:

oh i see MTA or BTA triac you meant.
can you plz recommend one for operating 250 W load at 110 V ?

thanks

 

[IanP]

The load depends on the triac type ..
For example, the BT137/500 (8A triac) should easily handle 2 - 250W bulbs at 110Vac ..

The "E" means is the same as "Ω", so 120E <=> 120Ω ..
Any resistor will be OK ..

Rgds,
IanP

 

[aliyesami]

last question but not least .. i cant find this part on either digi-key or jameco .. where can i buy it from ?

Added after 4 minutes:

searching jameco i came acrosss this one , can i use this ?


TRIAC, Q6008L5, TO-220AB, ISOLATED 8.0A 600V
Part no. 160215
Manufacturer TECCOR ELECTRONICS
Manufacturer no. Q6008L5

 

[IanP]

By all means, go for it ..

And one more thing: a small heatsink wouldn't heart ..

Rgds,
IanP