great explanation. I tried phase control for motor speed control. I have had issues of resistor burning from current limiting resistor on the A.C side.

Hello Sir, What's the use of R1 (10K) connected across GATE and GND ? How is the values for R1, R2 and R3 resistors are calculated ? Helpful video BTW. Thanks :)

we use moc3031 to control the speed of fan and thee output was not stable do you think the delay effects on the output?

Hi, thanks for your video How the triac work to deliver constant voltage on a smart switch without neutral ? (With capacitor on the bulb) Do you have a schematic ?

Very cool video, thank you for sharing.

I need a scheme tic circuit for 1/2hp dc230v motor speed regulator

Lewis, this was most helpful thank you for the video. I have a question I was going to use a MOC 3031 connected to a an arduino to run a lawn sprinkler. The sprinkler valve is on a 24VAC circuit at about 225 ma. From what I see this should work, can you confirm this? Or is there a better approach? Thanks

@LewisLoflin

7 жыл бұрын

By it self the MOC3031 won't carry the current.

While I'd prefer to just buy a random switch SSR relays for my project, comparedd to ZCD SSRs they're so damn expensive (and rare) that I'd rather try my luck with TRIACs. Thanks for such detailed explanation.

Hello Mr Lewis, If i want to control a single phased motor which has three wires. How should i connect the live, neutral and ground?

@LewisLoflin

7 жыл бұрын

The triac is connected to the "live" the neutral and ground are connected as usual.

In the H1 1CX circuits could you explain how the resistor on the gate works? I don't understand how it can do anything because it's not appearing to complete a circuit. Thanks

@LewisLoflin

5 жыл бұрын

That controls the gate sensitivity. Without it it turns on all the time. I used 47K myself.

Hi Lewis, How do we protect the above TRIAC based circuit from AC short circuit ? Will Snubber circuit work in that case ?

@LewisLoflin

7 жыл бұрын

A snubber won't help with a short. Use a fuse.

MOC 3041 or 63 with traic are quite old technology. Is there something better solution, available for soild State relay? Traic has good chance of failure. I am looking for some better IC with zero cross detector and with good protection. Please guide me.

excellent video. can i connect 2 or 3 TRIAC in parallel to drive more powerfull loads ??? i need a optotriac to each TRIAC ??? thanks

@LewisLoflin

4 жыл бұрын

I wouldn't. Try paralleling 2-3 separate circuits. Yes you need an optocoupler for each circuit.

Is the MOC 3043 turning off in AC because of the low spot or reversal of the current? And staying on in DC because there is none? And so these optocouplers would not work in anything other than single phase? Thanks

@LewisLoflin

6 жыл бұрын

It turn off when the voltage goes to zero.

Nice explanation, I have a doubt, for the snubber (5:57), could I use this values for a 0.5 hp @ 4 A pump water? Hope you could help me. Thank you

@shoppingoneclick2044

5 ай бұрын

Did you got answer?

@hectorbarrera9496

5 ай бұрын

@@shoppingoneclick2044 nop

please circuit diagram using triacs for on and off led lamps with power supply 220

@LewisLoflin

6 жыл бұрын

You don't use triacs with DC or LEDs.

Thanks, interesting video... I found some SSR which can control the phase based on input voltage (0/1-10V | 0 - 5V) or current 4-20mA ... How does these work and can these be used as dimmer for regular lightbulbs AND dimmable LED drivers... In the specs I could connect resistive and capacitive loads and simple cut the phase. These SSRS could be very interesting for my home automation and simply hook them to an Arduino pwm and simple RC. Or do you have better ways to create a steady but varying voltage using Arduino? Regards Dennis

Thanks for making this video very well explained sir, can you make a tutorial about ac/dc relay snubber circuits?

@wolfgangboettcher3126

2 жыл бұрын

Gleichrichter

Thank you Please how can i test a moc 3051 or 3052 in circuit and out of circuit With a digital multimeter

@LewisLoflin

2 жыл бұрын

You can only test the input LED maybe if the DVM can check LEDs. You can only check if the photo triac is shorted. It should read open.

How you are sizing the resistors and capacitors in the optocoupler with a triac circuit with the snubber?

@LewisLoflin

Жыл бұрын

Spec. sheets and working circuits. Optocouplers I allow 5-10mA. Snubbers spec. sheets, schematics.

1:33 What power rating do the resistors R2, R3 and R1 need? 1/4 W? 1/2 W? 1 W?

@LewisLoflin

2 жыл бұрын

1/2 watt is what I used.

sorry sir, why we can't use TRIAC for DC ? do you suggest Relay than Triac when we use DC?

@LewisLoflin

7 жыл бұрын

With DC once the triac is turned in with DC it will not turn off unless the DC is disconnected.

@nurulbasyiroh1385

7 жыл бұрын

+Lewis Loflin ooh I see. thank you very much sir

Hello sir, How can we protect TRIAC From high current OR Overload ?

@LewisLoflin

7 жыл бұрын

Use a triac with specs above what is needed. If you need 3 amps use a 10 amp. A dead short circuit will wipe out anything. If this was DC which you can't use with a triac use a current limiter. How about a circuit breaker?

@Dharmendrasavaliya012

7 жыл бұрын

sir, i need less then 2A for lamp dimming & i have used BT137 8A triac for it. But i had found on blog that triac blow off before MCB .

@shoppingoneclick2044

5 ай бұрын

I too Heard, people talk about failure of traic.

Hello, IF I want to use 120 volts, what is the values of resistor I must change, excuse me my english , thanks.

@LewisLoflin

3 жыл бұрын

Where are you in the video? In general the resistors are not critical.

@plinioabreu2185

3 жыл бұрын

@@LewisLoflin Thanks for answer, I am in the 5:52 time of video.

THANK YOU, FOR THIS WONDERFUL, CONCISE, AND WELL EXPLAINED LOOK AT THESE DEVICES!

what is power(watt) of 470R,0.05uf , 39R and 0.01uf component if load is 5KVA

@LewisLoflin

4 жыл бұрын

About 1 watt on the resistor and 5KV on the cap. This is a spike suppression circuit and isn't critical.

@meenakshimaurya7949

4 жыл бұрын

@@LewisLoflin 1W is enough for 39R .

@LewisLoflin

4 жыл бұрын

@@meenakshimaurya7949 In series with a cap there isn't much power in the circuits. It's a spike suppressor to prevent false triac gate firing.

@meenakshimaurya7949

4 жыл бұрын

@@LewisLoflin thanks

why we are using a capacitor of 100n

@LewisLoflin

4 жыл бұрын

Spec sheet.

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thanhs

I really dislike schematic representation where input is on the right and the circuit on the left, with no clear separation between input hot/live and the output live wire. Makes schematics hard to read and it is even worse for understanding what the hell it does.

What is triac ?

@LewisLoflin

3 жыл бұрын

A triac can be thought of as a solid state AC switch. Apply a small current to the gate it turns on.

@thehighriseconstructionob9679

3 жыл бұрын

@@LewisLoflin so triac is Base in transister ?

@thehighriseconstructionob9679

3 жыл бұрын

@@LewisLoflin thank you repray sir. triac is base in transister ?

@LewisLoflin

3 жыл бұрын

@@thehighriseconstructionob9679 No it is not a transistor. Its terminal are gate, MT1, and MT2. The gate must be triggered from MT1.

Stari pappendi Fai buddia

How come the current doesn't run through the RC snubber circuit while the triac is closed?

@LewisLoflin

Жыл бұрын

The snubber due to the small component values suppress/conducts the higher frequency, fast rise time noise spicks. 60Hz is ignored.

@peki1701

Жыл бұрын

@@LewisLoflinThank you!

SSR's are still a stupid stuff in compare to electromechanical realys.🥱

@shoppingoneclick2044

5 ай бұрын

I didn't understand your question? You mean relays are better then , traic + optocoupler?