Questions tagged [triac]

A TRIAC is a 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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27 views

NO current passes through the Opto-coupler in Proteus

I tried to run the AC circuit using Opto-isolator MOC3021 . But no current passes through it. These are the warning in Proteus simulation log Pin 'MT1' does not exist in child module. [U2] Pin 'MT1' ...
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38 views

Arduino based triac dimmer bulb flicker fix on touching Arduino ground

I've designed a triac based dimmer circuit. It is working just fine except the bulb is flickering on dimming (working fine with full brightness). Bulb I am using is filament based and dims perfectly ...
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29 views

Transmission gate vs triac

Both transmission gates and triacs can be used as an analogue switch, but I am a bit confused about what the difference would be in using them for a design. Is one better at higher current situations ...
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37 views

TRIAC not triggering

I am attempting to make a circuit that would allow me to control a standard CFL 13W lamp with a microcontroller. As the lamp would run on AC power, I am making use of the following circuit using a ...
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42 views

TRIAC driver circuit behavior when switching low current loads

I'm doing a project that involves switching different kinds of loads (edit: by that I mean loads that go from just a couple mA, up to 5A or so) using the usual TRIAC + opto-isolator combo (in my case, ...
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44 views

MOC3043 possible failure

Problem : BTA16 triac is always on with using MOC3043 as driver Facts: BTA16 working correct when moc3043 is disconnected from it's gate pin. Atmega8 output pin is connected to 330ohm resistor and it'...
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39 views

How to explain how the DIAC and TRIAC works in a digitally controlled fan regulator circuit?

There are two version of the circuit that do the same thing. One with capacitor, and, one without. The schematics below depict the circuit needed for diac/triac activation properly. (I have missed out ...
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43 views

Triggering BT139 triac with MOC3063 opto triac

First time poster having some problems with triggering triacs. I'm well aware of the dangers of working with mains voltage and I'm very careful. I'm using one BT139-800 triac to switch a 35W single-...
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3answers
80 views

Fuses & current ratings - are there fuses that blow “fast” close to their nominal rating?

The context or reason for this question is the following: Reminder: the question is about the fuse, not about the TRIAC. The context may help to understand the question. A 230V output is controlled ...
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2answers
68 views

Why did this triac driver resistor let the magic smoke out?

I hope the title is acceptable under this website rules but it is exactly what happened. I wired up this circuit that I thought I tested in the past multiple times, but I might have wired up slightly ...
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87 views

Why “substrate” is exposed through a “do not connect” pin at all?

I've were reading through MOC3041 opto-isolated triac when I noticed this part: "Substrate". It's also repeated later on one page down further, but there's no explanation. I guess that might be the ...
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51 views

Heinner OMX-600 blender motor not turning

I have this blender that won't spin when switched on, the leds turn on tough. I managed to take it apart:https://imgur.com/a/eMSSXm4 From the mains power (!caution is used all times!) we have: on ...
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62 views

How to test an ACS line switch

I have SMD AC line switch (ACS1207S) on my washing machine electrical board. I need to check if it is faulty, what's the appropriate test?
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46 views

Designing a triac based regulatable DC supply

I need about (30V-160V)32A DC for my project. I am trying to build an electronic circuit to regulate AC mains (220V, 50Hz) to produce voltage from 30V to 160V and rectify it to produce DC voltage. ...
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99 views

This Potentiometer Keeps Catching Fire And I Can't Locate The Short

Device: KADA 852 Hotair rework station (not 852D) VR9 keeps catching on fire and R42 is half toasted but still keeping its resistance, I removed and checked CA12 and CA13 and they are not shorted. ...
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48 views

Triac's gate isn't fully activated

I'm testing on BCR12LM-14LB8XO Triac. According to its datasheet, the gate is triggered by a 1.5v. https://alltransistors.com/scr/datasheet.php?pdf=BCR12LM-14LB I have a 2.7VDC power source, 700mA ...
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28 views

Using a triac plus an H-bridge to switch DC or AC

I've been working on a controller for inductive loads, and I want the system to be compatible with either DC or AC loads. I've got a 24V to 34V DC boost regulator powering an H-bridge, which is ...
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96 views

How to switch 1000w AC load with minimal heat?

I am trying to heat a 1000w heating element with 120VAC. I am currently using a thermocouple and SSR to regulate the temperature, but the SSR is getting too hot at full power even with a heatsink. In ...
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47 views

How to fix triac control module?

This is scheme of triac control module. I'm using optotriac MOC3041 (T1 on scheme) and triac BTA140 (T2 on scheme). Is it possible that my control module doesn't work correctly due to too small ...
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427 views

Triac Switch Circuit using MOC3021 and BT136

I am tinkering with BT136 & MOC3021 optocoupler to control AC loads, and below is the schematic i have put together. I have a few doubts here. Is the value of 100 ohm 1 watt correct on pin 6 of ...
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70 views

Triacs are getting damaged BTA41 BTA24

guys, I tried to make an SSR for my window Air conditioner 2 Tonnes "2.5kW" the problem the Triacs get damaged instantly I tried 4 Triacs so far 2 BTA41 and 2 BTA24 I tried different circuits, I'm ...
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34 views

How does a negative trigger close the latch in triac?

When anode to cathode voltage is positive, I get that the left latch will be closed if positive voltage is applied at gate. However when anode to cathode voltage is negative, I don't get how the ...
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91 views

TRIAC holding current

I'm having problem with triac handling. The plan is to use it to drive traffic light signals. The trigger is fine, but I want to use the hold current as a burnt bulb detector. Meaning, if the current ...
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50 views

Triac never switch off

I designed this circuit; PRI_LO and NEUT are connected to 220v. The "high side" triac is Q4004D3RP (datasheet). I measure voltage at J2. Whatever is the command signal, I always measure 220v. I ...
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45 views

Triac-Circuit not Latching

I've built this triac test circuit here: https://320volt.com/en/triyak-tristor-test-devresi/ My transformer only delivers 10.5 V, however. I've tested some triacs which seems to work well. Both LEDs ...
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58 views

What happen when same phase is applied to both MT1 and MT2 of an AC triac

If same phase is applied to both MT1 and MT2 of an AC triac while it is OFF, will it spoil the Triac? Eg. BTA16. Context BTA16 along with MOC3021 is being used to control a 220V AC appliance using a ...
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30 views

FOTEK SSR replacing the Triac

I recently bought a few of FOTEK SSR-40DA relays believing that they are 40 A. Anyway I've burned one of then connected to my boiler, and I've opened it, and it turns out that they actually having ...
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148 views

Motor 1kw 220V AC controll using BTA16-600BW

I am trying to change an analog AC speed motor control to digital control. The analog configuration has a BTA16-600BW and uses DB3 as diac. The snubber components are 1K resistor and 47 nF. I tried ...
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21 views

Does a hybrid DC relay suffer from contact erosion (albeit much less than normal), or is it effectively eliminated?

Given a hybrid DC relay, I've been wondering if contact erosion is occurring (albeit at a slower rate), or if the design eliminates this entirely. (Assume that there is no snubber or other contact ...
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36 views

Detecting different heat element power

I have a range of heating elements with different power ratings (i.e. different resistances). Is there a way for my microcontroller to detect what power they are so I can use the microcontroller and a ...
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26 views

Connecting phototriac substrate to adjacent pins

For a regulatory exercise I am analyzing the result of a short fault between a phototriac's substrate (MOC3023) and its anodes (one at a time). The datasheet warns ...
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164 views

Opto Triac driver (moc3051) basic circuit problem

I wanted to try the basic circuit of MOC3051 which is a random phase optoisolator triac driver. I used this circuit from the datasheet: with following parameters: Vcc : 3.3v Transistor : BD139 ...
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62 views

BT136 inner resistance

I found two datasheets for the BT136 triac: Datasheet one Datasheet two But those datasheets didn't mention the inner resistance of the triac (or I couldn't find it.) What's the resistance ...
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1answer
66 views

Transformer open circuit output voltage and current limiting resistor at gate of Triac

Im kinda new to electronics and have some questions before i solder my projekt together. I want to make an Arduino controlled soldering iron and designed the circuit below. The optocoupler i used is a ...
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118 views

BTA12 Triac driver circuit

I'm using circuit in the picture as a replacement for a mechanical relay running a 40 watt 220 volt water pump. The problem is the circuit seems to be correct, but it doesn't work and I'm getting a ...
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27 views

Triac failure and Capacitive Transformerless Power Supply Load

I have done a dimmer using a PIC microcontroller (with a Transformless Power Supply), with BT137 (sensitive gate, four quadrants), firing on QII and QIII, and its load an old fashion Edison style 220V ...
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48 views

Triac Switching Circuit

I will switch an ac load with a triac. I am providing a dc voltage of 5V on the gate of first Triac and 0V on the gate of second Triac. In the first picture the triac is working and the switch is ...
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88 views

Why would a 3-Quadrant Triac NOT be Snubberless/Alternistor/High-Commutation?

While researching TRIACs, I came across this question: What's the difference between 3 and 4 quadrant triacs? Ok, straightforward enough, and that matches Wikipedia's explanation. However, I ...
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151 views

How can an optocoupler detect the zero cross point in an AC wave?

I am having some trouble using Triacs in order to dim a light bulb operating at 220V AC, I am a student at school and I don't have any background about using Triacs or Diacs or so, so I seeked the ...
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52 views

Firing Triac strategy for motor phase control

I try to design a replacement potter's wheel motor controller for an old potter wheel. I have solve some problem and I am able to control the phase standard of filament light. Now I try my board on ...
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1answer
48 views

Simple voltage presence monitoring with negative power supply

I am switching a 230-240 V load with a TRIAC and relay while also monitoring the presence of voltage on both ends of the load (i.e. not measuring the amplitude -- just that the switch successfully ...
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148 views

Need help to design efficient zero crossing CURRENT detector : clamp diode solution

I try to design a replacement potter's wheel motor controller for an old potter wheel. I have solve my zero crossing voltage detector and TRIAC command. Now I begin to understand the importance of the ...
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1answer
196 views

Help for TRIAC strange behavior

I try to rebuild an electronic board for an old potter's wheel. I try to build a "Phase Angle Control" with BTA16-800BWRG and MOC3043SR2M to control motor speed (the old board seem to use this ...
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169 views

TL431 crowbar simulation problem

I'm trying to simulate crowbar circuits, which is mentioned on page 8 of ON SEMI TL431 datasheet (https://www.onsemi.com/pub/Collateral/TL431-D.PDF). I'm using TINA TI for this. There are two circuits,...
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32 views

Demultiplexing analog fast signal for 2-axis piezo movement

I am driving a 2-axis stick-slip piezo stage. Currently, I have two controllers, one for each axis. However, I would like to know how can I reduce it to a single controller? I need a sort of a ...
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73 views

BT137 triac turns-on uncommanded

I am working with the following circuit, which is from the MOC3043M datasheet with a BT137 at the location of the unnamed triac: This circuit works fine for me if I leave the snubber out. However, ...
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91 views

RFI filter modeling in LTspice w/ triac

I have a few questions about modeling an RFI filter in LTspice with a triac-based dimmer circuit. I'm referencing the circuit described in Figure 11 in Triac Principles and Circuits -- Part 2 (Nuts &...
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55 views

Feedback on time-delayed TRIAC design

I would appreciate some feedback regarding the design I came up with. While I am not unfamiliar with electronics, this is the first time I actually designed something myself. The purpose is to solve ...
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35 views

Triac gate and T1 short circuit forever with inductive load

I am using MOC3042 with BT139 and snubber 390ohm/2W and 10nF/400V to on/off motor from microcontroller, I can't find data about the motor as it's an old one but it drives quite large shutter
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82 views

Issue with universal motor velocity control by microcontroller

I'm using the circuit in the picture with a BTB12 600BW snuberless triac to control an universal motor (picked from a old washing machine, 220 VAC, 50 Hz) controlled by an arduino nano in customized ...

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