1. A

    Need help getting a control signal to a TRIAC

    I'm trying to make a schematic, where one IR motion control light switch turns on only one light and another IR motion control switch turn on both lights. I have tried many things, especially diodes which I have currently set up, and work almost perfectly, but the problem is that one light is...
  2. alrn

    Can I use BT139-800 or BT139-800E equivalent Triac for T16C8 ?

    Can I use BT139-800 or BT139-800E ? I am a beginner in electronics and trying to fix 875VA & 675VA inverter boards. Both inverters have problem in charging section. one inverter is taking high current from battery while inverter is on and then battery low indicates then inverter goes off and...
  3. A

    single phase motor control

    Hello, I use triac to control the permanent capacitor motor. I have attached my schematic and two methods I found for cutting signals. 1. power is applied for several continuous half-cycles and then removed for several half-cycles 2. use the dimming method please help me with their...
  4. M

    Help! Triac operation for AC motor

    Hello everyone and greetings. I have got my hands on this massage chair that has all it's functions working all right except for the up down mechanism. As soon as it is started the main assembly moves up and hits the upper limit switch but the drive motor does not stop and starts to vibrating...
  5. flaviodsilva

    Motor control using MOC3041 optocoupler

    I'm currently doing my master thesis, and I'm now at a point where I have to control a few AC motors with a microcontroller. From my previous study about the subject, and from previous similar thesis, I've noticed a common practice is to use an optocoupler to separate low voltage from high...
  6. E

    Triple-555 timer circuit not working in Proteus

    I am new to 555 Timers and Proteus and I need help to fix a circuit I have built. The intended function of the circuit is as follows. The logic is controlled by an external circuit but it is represented by switches within this circuit to purely test the 555 Timer functionality. The switches...
  7. K

    Heat plate triac control, R2 value

    I am not sure how to calculate the triac R2 value. Real componets are: BTA12-600CWRG (Triac) and KMOC3063 (Zero-Cross Triac driver photocoupler, IFT 5mA). Optocoupler input will by PWM controlled by 3.3V MCU (ATtiny1604). Imax R1 = 5.2 mA and Imax R2 = 50 mA (in LTspice simulation).
  8. Luiz Fernando Vieira

    triac optocoupler with dual output

    I'm having trouble finding a tric coupled photo with two independent outputs. Diode input can be the same, it is not necessary if 2 separate diodes. Someone could indicate a specific model, website or name of the component.
  9. D

    How do I fix my Triac based control circuit used for induction motor speed control?

    Hi guys, so I have designed a speed control circuit for an induction motor. The circuit consists of a zero cross detector circuit whose output pulse is the input to a 555 timer. The 555 timer is used to generate a PWM wave that is then inputted into an optocoupler. The triac control circuit then...
  10. L

    TRIAC (BTA41-600) and optocoupler (MOC3041) not working with load

    Hey guys, it's my first post here, so I'm sorry if I'm doing it in the wrong place and I really hope you can help me! I'm developing a dimmer with ESP8266 and I'm having trouble with the TRIAC circuit. I have a zero cross detector developed and it works fine, but when I try to send the signal...
  11. B

    Triac fusing current check

    Hi Guys, I have bought a triac which have a value of fusing current = 166 A2S for Tp=8.3ms mentioned in the data sheet I am wondering how can i check this value? Also , for the current pulse width triggering the TRIAC (0.5ms). Thank you for your support
  12. I

    Delta connected load on- off control

    Hi, I have to on-off switch a AC load, which delta connected 3 phase AC source. Consider the load that will be switched on-off is Z1. To achieve on-off switch, I think use zero cross triac opto driver and triac for both Phase-R and Phase-Y. But I am confused. When Phase-R reaches zero point...
  13. O

    Triac BTA208S600D, BTA208S600F blinking or working unstable

    Hello! Please help me validate the electrical design and the set of the components. The goal is to create removable modules that could switch the different types of payload: 1. DC MosFET module - switching and PWM of the 9-56V with 4A 2. AC MosFET module - switching and dimming (front and...
  14. IvarsOzolsDB

    300W AC light dimmer mod to 500W

    Bought Stairville PAR56 Active 300W and got a bit dissapointed in light output. So I got wondering maybe there is some mod I could do to put 500W 230V PAR56 bulb in it (originally 300W 230V PAR56) and not fry dimmer circuits. I traced schematic (look in attachments) in high voltage part, as it...
  15. P

    Triac Simulation Question

    Hello all, New to the forum and came here to get some more information about simulating mains voltage Triac circuits. My issue is the following; I have an opto-isolated TRIAC control circuit for a resistive load (water boiler). I know that Triacs generally have a junction voltage drop of ~1-3V...
  16. M

    Triac-controlled motor problem

    I have a bit of a problem with controlling a universal motor with a Triac. I have built the circuit shown in the attached picture (designed by someone else) and then I've written the software to control the firing of the Triac from an Arduino. It all works very well except that every now and...
  17. V

    Understanding the significance of a few passive components

    Hello all, I'm currently doing some work on a piece of equipment which has been in my work's storage cupboard for about 8 years. On said piece of kit was this PCB that has seen better days (picture attached). I can't find any paperwork for it and it doesn't appear on any of my electrical...
  18. A

    Input supply jerk of triac when power turned on

    Hi, I implemented the circuit from this video. After implementing, I realized a mistake, whenever the main supply switch turns on, there is an initial jerk (also visible in the video, the link starts video video from that point of issue) then triac operates as per gate voltage level on gate. Is...
  19. sukhoi191

    Triac equivalent (131-8D) in a coffee machine

    I bought a damaged Lavazza coffee machine. After quick analysis I've found something in TO-92 case, which apparently exploded for unknown reason. It's literally in pieces, but I was able to find that the last letters describing the model were "8D" at the top and "30" at the bottom (see...
  20. mike_the_begginer

    Arduino PID soldering station with zero crossing detector

    I build on bread board the attached schematic and I uploaded the attached code to an Arduino Uno. I tested each part of the schematic (the pot, the OpAmp, the zero crossing detector, the optotriac) and they are working. The problem is that when I start the circuit I got the attached screenshot...