Electronics > Projects, Designs, and Technical Stuff
Making a triac phase control circuit - are my values correct?
ExtraThiccBoi:
I mean sure, but i need it to be as simple as possible and in operation next week.
ExtraThiccBoi:
I should get the parts this week, so I'll update this post whether my house burned down or not ;D
Zero999:
--- Quote from: ExtraThiccBoi on March 06, 2020, 09:52:32 am ---I mean sure, but i need it to be as simple as possible and in operation next week.
--- End quote ---
It depends on what skills/parts you have at your disposal. Burst control can be implemented with a microcontroller, but if you have a PLC then it's just a programming exercise.
ExtraThiccBoi:
That is way above the budget, requirements and my skills :/
ExtraThiccBoi:
--- Quote from: floobydust on March 04, 2020, 06:59:18 pm ---You'll have to see how it works with the inductive load. No difference between the small and med size triacs because the phase-control is just a time delay which is the same for any triac, and the gate trigger pulse is enough.
The chinese 2W WTH118 potentiometers have a low-quality carbon track and the resistance (end-end) can be 20% out and they are not linear. The extra 470k resistor across the pot was to get rid of the dead spot, where nothing happens and then a sudden jump at say 10'o clock.
The 3.6k I added to limit max. current through the potentiometer after one started sparking.
--- End quote ---
Soo built the circuit, but I must have gotten something wrong because i got a bunch of flashes (with 75W bulb) and then the triac died. I didn't include the FBR, the two resistors and the 470k across my pot (also 470k). I used 3.3k resistor in series with the pot, 0.047u cap as you recommended. Idk what happened :-\ The circuit was wired according to the schematic. The triac turned into a 60 ohm resistor.:( I guess the gate current was too high when I turned the pot all the way?
Edit: my parts tester (the cheap atmel based chinese one) reads both of my triacs (good one and bad one) as resistor between MT1 and G. Does that mean both of them are broken?
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