A TRIAC is an component often used to control high power currents, both as a switch and as a "dimmer"-like construction for controlling lamps or electric engines.

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does polarity matters in this AC circuit

I am using the following circuit to drive a single phase AC motor using a microcontroller. I am worried about the polarity and need to know if it would be a problem if the polarity is switched, ...
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33 views

Should serial triac dimmers work for resistive load?

I have a cheap 120V hot plate that I assume regulates its temperature using a triac dimmer (because the heating element vibrates/hums at lower settings). But at its lowest setting it still gets too ...
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41 views

Triac limitations on mains (BT136-600)

Could someone tell me what are limitation on main ac on this triac and how to calculate current inside main circuit? http://www.nxp.com/documents/data_sheet/BT136-600E.pdf Here is how my circuit ...
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58 views

switch for AC voltage

I am designing a switch for AC circuit. E.g. when I apply a small DC voltage, AC current is allowed to conduct, otherwise there is huge resitance stop the current from flowing. I found 2 possible ...
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3answers
78 views

Triac BTA316 does not turn off

I had a look to other posts about Triac and I am pretty sure my problem was not in there. The goal of my system is to realized a controlled switch for home appliance. Then I designed a power supply ...
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1answer
49 views

Power rating for opto-triac trigger circuit resistors

RHS will be using 220v 400watt bulb 2 simple questions 1- does the 360ohm resistors has to be of high watt too ? 2- all i can find is 5-10watt resistors, can i use them ? would they snub correctly ...
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50 views

220V AC Light Dimming(triac H11AA1, MOC3052-M)?

Could I use triac H11AA1 and MOC3052-M to control 220VAC with arduino? I am new to electronics and I am not sure if that components can handle the voltage... Also could you show me some circuit with ...
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59 views

How to control AC high voltage with Arduino?

I found this great post: http://majsterkowo.pl/en/how-to-control-any-home-appliance-using-a-tv-remote-and-an-arduino/ and this scheme: ...
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63 views

What is the intended use of high current SSRs and triacs?

I answered a question recently regarding power dissipation in solid state relays. This is the calculation: Consider this 40 A rated triac - BTA40. Vto = Threshold voltage = 0.85V = Voltage drop ...
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3answers
77 views

Can I use a TRIAC on a secondary isolated AC winding?

Can a TRIAC be used on the secondary winding of an AC isolation transformer? Say I have 230 V on the primary, but I want to use the 12 V AC secondary, will a TRIAC work on the secondary? ...
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91 views

Light dimming regulator circuit

Here in this circuit, We have the load connected to a diac and triac circuit along with a variable resistance and a capacitor. When the circuit operation begins initially, the energy is stored in ...
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1answer
50 views

What to use to switch AC power supply using 5v micro controller? [closed]

Here is my question and situation in more details. I am working on a college project where I need to switch on/off AC appliances using 5v Micro Controller. Appliances can be fan, motor, Fridge, Air ...
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29 views

Synchronised Switchboard Controller

I'm Designing a wifi controlled electrical switch board for Home Automation project. Im planning to retrofit the solution into old switchboards which can be controlled wirelessly. Im using triacs for ...
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2answers
51 views

How do I gate a z0103ma triac using logic level output?

I'm trying to switch an el wire segment on and off by using a z0103ma triac. I have the AC current connected across pins 1 and 3, and when the gate is closed, the ac current is interrupted, but once I ...
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1answer
109 views

How to design a 2 way switch using Triac and SPST standard switch?

I have a triac which I turn ON and OFF by giving a gate pulse through microcontroller. With the help of triac I turn ON/OFF a light in my bedroom. The bedroom light is connected to a standard SPST ...
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42 views

480 VDC Series Battery Bank - Intelligent Discharge Control Circuit

I have a Lead Acid Battery Bank (40 x 12 VDC 50AH Batteries in Series) that services a small variable DC load of lighting and small heating elements. I want to protect the battery bank from being deep ...
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3answers
97 views

Automatic calibration of a zero cross detector latency

I have a circuit similar to this one (different component values, different uC): I expect a large phase error in the ZCD. The load is purely resistive and of unknown value between 100W and 1000W. ...
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2answers
118 views

Triac-Diac Dimmer build

I recently bought a DIY 1000W AC motor dimmer meant to be powered off 220-240VAC. I was hoping to use this to control a transformer which in turn powers a heating element. The heating element needs ...
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2answers
142 views

Using zero crossing detector for brightness control of several loads

Zero cross detector(IC H11AA1) generates a pulse exactly at zero crossing of AC wave. I am trying to control the brightness of several bulbs(nearly 48 loads). I have 5 different states for them. At ...
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1answer
62 views

Question about Triac vs Rlay [duplicate]

I am a software developer with little knowledge of Electrical Engineering. I have delivered some Raspberry PI projects that extensively use Relays. I recently heard that Triacs are much cheaper and ...
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137 views

Arduino driven triac circuit (SSR)

I found a nice circuit for my Arduino project, I wish to control AC based tools and machines up to 6A. The circuit had some issues but it was discussed and fixed on this link: Triac driven dimmer ...
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110 views

How to trigger triac using DC?

This video features a circuit that triggers a triac using a DC: https://www.youtube.com/watch?v=ZXXup79B6Gc I would like to make a little modification on it it. The video says that I have to connect ...
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1answer
66 views

A question about very simple light Dimmer circuit?

I've learned that a Triac works as a switch for controlling AC current. Why not connecting the load (L1) and Triac in series? at the position of red arrow? My reason is that a small amount of current ...
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1answer
70 views

Triac dimmer component

I was looking for a way to dim a regular light bulb in a circuit. With the help of this site, I learned that using (variable) resistors would dim the light, but eat up electricity in the form of heat. ...
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2answers
64 views

What type of Resistors be used with Triac terminals? 1/4 or 1 watt

I have used BTA41-600 with MOC3083. I Keep frying my MT1/2 connected 330E and 360E resistors. Resistors were used as per datasheet recommendation. I was using 330E and 360E but, both kept frying. 240V ...
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148 views

I am using a triac bta41-600b with MOC3083, doesn't work

I have used the circuit from Datasheet of MOC3083 directly. Problem is triac does not fire. 0.1uF cap is MPF and all the values given in data sheet are used as they are. I am using a 100W incandescent ...
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1answer
66 views

Electromechanical or Semiconductor solutions to control chandeliers and homes stuff

I've been designing some wireless modules and finally got them to work and now I have a network of them and want to use them for home automation purposes. Controlling stuff like chandeliers, heating, ...
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50 views

What happens when triac terminals MT1/MT2 are switched?

According all literature, terminals MT1/A1 and MT2/A2 must be connected to neutral and phase respectively. What happens if you reverse the wiring? House sockets here are randomly wired, so it's a ...
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38 views

Drive several triacs

There are several projects with triacs for cargo, including drives with use of it in parallel (which I don't recommend), but mine is the following: I'm replacing the triacs by lowly switches to that ...
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66 views

Short-circuit when switching off TRIAC circuit

I'm developing a circuit to control electric lamps using a TRIAC. I tested the circuit and it can switch on and off the lamps without any problem. For tests I'm using a regular light switch to cut the ...
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1answer
71 views

Digital replacement for Rotary Capasitor based fan speed controller

Is there a circuit using Triac and capacitor in series to control the speed of ceiling fan? There is a circuit using SSR but I wish to use Triac as SSR are bit costly. ...
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2answers
169 views

Triac fails unusually

The circuit is a MCU triggered, capacitor based fan speed controller. The circuit works fine when a single triac is connected but when both triacs are wired and triggered alternately, any of the ...
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100 views

Braking a motor commanded by an IC H-bridge

Firstly, some premises of the design are related to the high speed needed (maximum as possible) and precise stop point. The motor is feed at a maximum of 40V and consumes at normal operation 1.5A. Due ...
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93 views

Better triac gate configuration

I'm an intern who was tasked with finding a way to switch on a motor and solenoid from either 120 or 240 VAC. The circuit on which my supervisor suggested I base my design can be seen below. My ...
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3answers
224 views

Optoisolator with EL wire won't turn off, TRIAC works fine. Why?

I'm pretty new to electronics, and I'm making a circuit to control EL wire with a DC logic control signal. Specifically, I would like to blink the EL wire with the output of a 555 timer. My first ...
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1answer
255 views

Parallel TRIACs driving same load

I am designing a series of heaters. One of them, actually, is designed for 220V and uses two resistors on series to achieve the power desired. The total current is, on peak, almost 20A. To keep the ...
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1answer
78 views

Can someone verify my EL wire oscillator?

I'm pretty new to electronics, but my latest project is a circuit with two "frames" of animation that I make out of EL wire, and I want to build a circuit to switch between them every 2-3 seconds or ...
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1answer
41 views

Gate controlled turn-on time

Under DYNAMIC CHARACTERISTICS for BT137 is Tgt value set to typically 2us. If I then look under BTA16, I see no mention of the pulse width. Is there a minimum pulse width as a standard value for all ...
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69 views

Sensitive or not sensitive gate? [closed]

If there is nothing about it in the datasheet, how can I find out if it is a sensitive or not sensitive gate?
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1answer
77 views

Difficulty understanding data over opto-diac

I'm having difficulty understanding the data over MOC3021, DIAC side. Should I see it as with DB3? So DB3's \$V_{bo}\$ (28-36V) is the same in opto-diac, and DB3's \$V_o\$ (min 5V) is the same as ...
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68 views

How is it possible to use TRIAC dimming with an 110v input LED T-8 Tube light?

I have seen T8 or T10 Led Tubes made for entertainment lighting that can plug into a Triac dimmer and be dimmed down to approx 10% with no flicker and no color shift. Attached is a picture of the ...
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1answer
88 views

Switch high frequency AC on/off at zero crossing

I have a 3 phase generator which is powering some system. (50Vrms @3A, with variable frequency from 50-5KHz). I've used mechanical relays to control each phase to the load. However, there was no real ...
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1answer
51 views

TRIAC controlled fan voltage issue

I have a question that seems to baffle electricians that I've spoken to. I'm running a 115V Fan off a TRIAC controller that utilizes a 0-10VDC control signal. When I power the DC control signal ...
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1answer
215 views

Question regarding a resistor in optocoupler/TRIAC circuit

I'm building a ac motor starter with a optocoupler (FOD4218) and a TRIAC (BTA16), one for each phase in a three phase 400V system. I have a question regarding the circuits that can be found all over ...
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2answers
155 views

Parallel TRIAC's for greater heat dissipation

Is it possible to parallel TRIACS to lower heat dissipation per device? If so, what would be the best strategy to ensure balanced current sharing between devices? The target application is to switch ...
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2answers
195 views

Triac - opto-coupler Circuit Confusion

I have the following question regarding this circuit: How is the opto being used to trigger the base of the triac?The collector of the photo-transistor is connected to the base of the triac. As per ...
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76 views

Considerations when repairing dimmer switch

I originally asked this question on DIY StackExchange. So far no answers and a suggestion to try on Electronnics, so here goes: I have an IKEA lamp with dimmer switch which took a knock and ...
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4answers
62 views

230V AC Wave forms in an analog ocillocope

I was doing a project on AC Phase control using triac,and I needed to see the phase controlled waveforms in a scope.But the scope that I am using has maximum volts/div as 5V (found on many scopes as ...
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3answers
141 views

Live switching AC loads with TRIACs or SSR

I have been designing a system whose purpose is to provide high reliability to a set of outlets (8), it takes to inputs of diffrent phases mains current, now the purpose of the system is that if the ...
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1answer
262 views

triacs from dishwasher

I have PCB from broken dishwasher and I would like to learn something from it. There are 6 smaller - STMicroelectronics Z7S, 1A triacs and one bigger STM T4 3570. My guess is (cannot verify it now) ...