The problem with dimming AC LED Light Bulbs DIY Trailing Edge Dimmer
video description
So. Love your video, the FL5150 variant is exactly what I need, I just need a few minor adjustments, so I can actually use it on a daily basis. So I found your instructable, opened it in the EasyEDA editor and found I cannot change anything. The changes I need to make: change R2 into a pot (like R1 in the ATTiny variant) and create a different PCB-layout (so I can mount it in my wall socket.
How can I make these changes to your design? Would love you to enable me to stay creative on this one; 0)
Date: 2020-09-05
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Comments and reviews: 9
Jay
What about 1000watt load at 110v
Could you please help me about my this query!
Firstly, i tried bta139 but that didn't work fine then after i used bta41-600b that worked quite good but still facing one problem when i turn on my circuit and connect my 10ohms resistive with apply 110v the mains voltage is decreasing from 244 to 220 or 222
all the lights are minor dimming because of high load connection my mains rating is near about 3kv. I'm using snubber circuits with bta41 zero crossing detector is okay everything is working fine, should i connect pf to output side to it will give me constant voltage?
reply
What about 1000watt load at 110v
Could you please help me about my this query!
Firstly, i tried bta139 but that didn't work fine then after i used bta41-600b that worked quite good but still facing one problem when i turn on my circuit and connect my 10ohms resistive with apply 110v the mains voltage is decreasing from 244 to 220 or 222
all the lights are minor dimming because of high load connection my mains rating is near about 3kv. I'm using snubber circuits with bta41 zero crossing detector is okay everything is working fine, should i connect pf to output side to it will give me constant voltage?
reply
Warren
Hi Love your video, and I'm with you on that ( it's just arrived but I can't wait to build it scenario, I've been there myself!
Anyway I recently made my own dimmer but what I did was recitfy mains, step it down and, P. W. M.
Via a 4029 counter ended up with single push button control flipflop direction every alternate button push illumination levels remaining when I remove input, also has a back up battery, BUT BEWARE OF CONTACT BOUNCE use MAXIM'S switch debounce IC.
Kind regards Warren
reply
Hi Love your video, and I'm with you on that ( it's just arrived but I can't wait to build it scenario, I've been there myself!
Anyway I recently made my own dimmer but what I did was recitfy mains, step it down and, P. W. M.
Via a 4029 counter ended up with single push button control flipflop direction every alternate button push illumination levels remaining when I remove input, also has a back up battery, BUT BEWARE OF CONTACT BOUNCE use MAXIM'S switch debounce IC.
Kind regards Warren
reply
SkyWizardless
Why on earth are you using an opto-isolator to drive the MOSFETs? The circuit ground could easily be live anyway if AC input is connected backward, and you have the high voltage side of the opto connected to +12v. Arguably you'd be better off removing the opto and driving the MOSFETs via a transistor as the only thing the opto is doing is giving the illusion of saftey.
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Why on earth are you using an opto-isolator to drive the MOSFETs? The circuit ground could easily be live anyway if AC input is connected backward, and you have the high voltage side of the opto connected to +12v. Arguably you'd be better off removing the opto and driving the MOSFETs via a transistor as the only thing the opto is doing is giving the illusion of saftey.
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Junior
Very good Congratulations. I am an electrician and one of the major problems I face when using dimmers with led lamps is when I turn on more than three lamps on the same circuit. For some unknown reason, grouping multiple light bulbs always causes unwanted flicker during dimming. Any ideas on what causes this problem?
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Very good Congratulations. I am an electrician and one of the major problems I face when using dimmers with led lamps is when I turn on more than three lamps on the same circuit. For some unknown reason, grouping multiple light bulbs always causes unwanted flicker during dimming. Any ideas on what causes this problem?
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Willem
I have a question: Why are these trailing edge dimmers more silent? The noise is coming from the large magnetic field generated by fast changing currents. With trailing edge current is also fast changing so the magnetic field will also be large but in opposite direction. Why is the noise gone?
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I have a question: Why are these trailing edge dimmers more silent? The noise is coming from the large magnetic field generated by fast changing currents. With trailing edge current is also fast changing so the magnetic field will also be large but in opposite direction. Why is the noise gone?
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Robin
How does a dimmer circuit like this work with a non sinusoidal ac waveform? For example a square wave, or a modified sinus wave that some inverters uses. Would the triac activate at the zerocross region even if the change is nearly instantaneous? Just wondering for learning purposes only: )
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How does a dimmer circuit like this work with a non sinusoidal ac waveform? For example a square wave, or a modified sinus wave that some inverters uses. Would the triac activate at the zerocross region even if the change is nearly instantaneous? Just wondering for learning purposes only: )
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bledlbledlbledl
I used to have a homemade dimmable AC LED LIGHT. It consisted of a simple inductor to limit the AC current, then a bridge, cap, and the LEDs themselves. It worked well, although it was a bit bulky. (Would still have it, except that I tripped and dropped it and it broke)
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I used to have a homemade dimmable AC LED LIGHT. It consisted of a simple inductor to limit the AC current, then a bridge, cap, and the LEDs themselves. It worked well, although it was a bit bulky. (Would still have it, except that I tripped and dropped it and it broke)
reply
Filip
Why optos and not just a bipolar? Your low voltage side isn't isolated anyway, so why bother? The previous one made sense as you were able to isolate the two but here. just seems like a waste.
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Why optos and not just a bipolar? Your low voltage side isn't isolated anyway, so why bother? The previous one made sense as you were able to isolate the two but here. just seems like a waste.
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Divanshu
I have a little doubt on the schematic front. How is the ground connected to the midpoint of both the MOSFETs? Won't it destroy the circuit as mains supply flow through that point.
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I have a little doubt on the schematic front. How is the ground connected to the midpoint of both the MOSFETs? Won't it destroy the circuit as mains supply flow through that point.
reply
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