hai all
i would like to controll a triac BTA12 using the 89c2051
which will switch on the triac when an interrupt is occured
i want this triac to be on for both the cycles as i am connecting
the triac to switch on a bulb
could anyone please provide the schematic for that?
should i use optocouplers for isolation?
or any other method is there?
Use an Moc 3020 and an bc 547 an few componets and you have the problem solved.
Use similar circuit and just changing the resistor of 470 ohm tow lower if you use 5 V supply.
You can remove the led that indicates the output is on and change the value of the resistor.
dear ave
thank you for the reply
when i am using AC for the bulb,i heard that
the triac will be off on the -ve half cycle
is it so?
if so there will be the problem of power loss
and i want to switch on the bulb continously
not to controll the intensity
Int this configuration the triac is on in all cicle becouse the tension that is on the gate is the tension on the main supply an not an dc tensio.
The optoacupler is able to let the triac be fired in the positive cicle and negative
The gate is syncronized with the Main and the triac conduct all the wave.
Just need to put a tensio on the gate of thr transistor and its all ok
thank you for your reply
what should be the value of resistors R1/R2/R3 ?
which is connected from the main to the optocoupler?
i think i can connect the 89c2051 pin directly to the opto coupler
without the transistor to the optocoupler as the 89c2051 can source
current up to 10 mA
i think i have to provide a resistor of 220 ohm from +5v to the opto coupler
hai
thank you for your reply
BT 139 is not available here
can i use BTA12 insted?
i am using MOC3021 will it be ok?
should i make any modifications to the circuit?
please reply