Re: How to know if LED driver is potentiometer dimmable?
But output is still smooth DC? So basically step-down with single turn current control potentiometers?
Also how does this thing work? [url]https://www.aliexpress.com/item/32873844140.html[/url] Is there any technical difference compared to speed control? searching for it the internet seems to reveal that it has no capacitors so I guess it's quite bad? Basically an other version of step-down but this time just without capacitors?Re: How to know if LED driver is pot.../>
But output
LearningToRepair
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Last Activity: 11-26-2021, 03:39 PM
Joined: 07-15-2020
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Re: How to know if LED driver is potentiometer dimmable?
Ah ok tnx. Then it's basically a step down converter? Or what's the exact difference? Why is it sold under speed control name instead of step down? And if for example I had motor and I used step down instead of this speed controller, would there be any difference? Just trying to understand how it works and how it is different from other similar stuff.Leave a comment:
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How big problem are insects for power supply?
If power supply has ventilation holes from which insects can enter, and it is near the lamp - that means insects are attracted. How bad is it? I found that my ceiling light's built in power supply had a ton of insects inside and in this case it did not seem to cause problem. But how is it in general?
For example one of the worst case scenarios would be
Or a little bit better would be:
Will they cause arcing with 230V AC?
If it is known that it's gonna attract insects is IP67 the only option or are these kinds of power supplies fine...Last edited by LearningToRepair; 11-08-2021, 05:48 PM. -
Re: How to know if LED driver is potentiometer dimmable?
Since you mentioned a new way that I have not heard before I wanted to know how it works from technical side. Whether or not I use is not important. Just wanna know how it works. Does it replace IC? Does it inject some code modifications to IC? Does it require led driver to have special connector to talk to it or how does it work?...Leave a comment:
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Re: How to know if LED driver is potentiometer dimmable?
Yes, 5m rolls.
But how does this aliexpress controller work that was linked above? Does it go between power supply and LED strip? Or do I have to open power supply and somehow modify it so that IC would get it's feedback from that instead of voltage divider resistor or what? It's kinda confusing me. I mean most of general purpose power supplies dont have sockets for external current controllers.Leave a comment:
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Re: How to know if LED driver is potentiometer dimmable?
One more question, if I want to use led powersupply/driver with actual dimmer instead of potentiometer as asked earler? Does every model support it or should I assume that if specs dont mention dimming then it does not work with dimmer?
LED strips.
How does it exactly work? It says it's for motors....Leave a comment:
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Re: How to know if LED driver is potentiometer dimmable?
How does it look like in specs? Do I need to read entire manual or does it say it plainly in specs? I cant find this anywhere when I look at products. I am currently trying to figure out if shops in my area just dont list this in specs or if I just dont know what to look for.Leave a comment:
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How to know if LED driver is potentiometer dimmable?
Hi!
I am looking to dimm 230V AC -> 12 DC LED driver with potentiometer. How do I know if I can dimm LED driver with potentiometer? I found from internet that 0-10V dimmable drivers can also be controlled with potentiometer. Is it so with every driver that says it is 0-10V dimmable? Or how do I know which are and which are not? -
Re: What's the use use of these things?
Tnx for info. Does anyone also know something about transformer related questions and whats that thing on top of it?Leave a comment:
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What's the use use of these things?
Hi!
I have attached image to this post.
I have marked some cloth sleeves with nr 1 and some plastic cover with nr 2. Does anyone know what is the use of those and are they required? These sleeves with nr 1 are not shrinking tubes. but since they are already around insulated wires, I cant think of any practical use so I thought I would ask those smarter than me. Other thing is plastic cover on top of transformer. Would something happen if it were removed? If the metal case is grounded and some parts of transformer's outer metal frame touch the metal case, would some... -
Re: Do capacitors have maximum allowed amps rating?
Thought I would ask - if I want powersupply for livingroom LED lighting setup and I want more power than those typical fanless supplies would give and I cant place that supply in an other room, what would be good options? One is rebuild case from scratch and have large fans with low RPM. Any alternatives to that?...Leave a comment:
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Re: Do capacitors have maximum allowed amps rating?
Thanks for info. Can I tell good psus from bad somehow? Like if I open it will there be any visual indicators? I mean if it visually looks bad then it is very likely bad but can I assume that if it visually looks well done then it is good one?
Also one more question: How much do capacitors need cooling? I want to modify fan to have 0 RPM mode if it is not hot enough. If that modification goes wrong would capacitors be one of the first things to pop or one of the last things to pop?
PS I have occasionally...Last edited by LearningToRepair; 04-11-2021, 01:05 PM.Leave a comment:
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Do capacitors have maximum allowed amps rating?
Hi!
I am interested to know what happens to capacitors when too much load is applied? Do they only pop on overvolt or also on over load?
In SMPS caps are in parallel in order to get rid of ripple. If I exceed capacitors supply ability will I only get tons of ripple or will they also explode at the some point? And is there way to calculate max allowed amps for capacitor if I know actual volts, allowed max volts and capacitance? And also is there some rule that for example if I got this power supply from china then calculated maximum load should be divided by 3 to be... -
Re: How to read PCB symbol for 6 pin push-pull switch?
Managed to get it in the proper way.
Whats that symbol exactly? Like the symbol that I marked with nr 2 on my attached file? Just asking so I know how to read these in future....Leave a comment:
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How to read PCB symbol for 6 pin push-pull switch?
Hi!
I am a bit confused how to read PCB markings for 6 pin push pull switch. I had problem with my 6 pin push-pull switch on my UT58A multimeter. It did not lock properly. So I decided to replace it. I forgot the orientation of original button. And now I need some help with understanding PCB.
I learned from google how to identify orientation of push-pull button:
But I am a bit confused which way PCB expects it. I expected that PCB would have some kind on intent marked on it. But mine has 3 marked instead. I attached the photo of it where I marked... -
Re: Have you tried to socket mosfet?
What is "electromechanical strength" in this context?
> but not in anything that pushes them hard, it was in monitor flyback circuits.
I also dont have high load.Leave a comment:
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Have you tried to socket mosfet?
Hi!
I thought about socketing D880 instead of soldering. Would socket like [URL="https://www.aliexpress.com/item/1005001792332717.html"]this[/URL] hold it? Also would short pins of this socket be a problem? I mean I kind of like these because that would fix it against PCB but I am worried if heat of solder would melt the plastic with that short pins like linked product has?Hi!
I thought about socketing D880 instead of soldering. Would socket like [URL="https://www.aliexpress.com/item/1005001792332717.html"]this[/URL] hold it? Also would short pinsLast edited by LearningToRepair; 01-19-2021, 05:40 PM. -
Re: Does power supply have to have metal case?
Thanks.
For humans it wouldn't do anything? I guess it wouldn't be much stronger than wifi/mobile networks that are already around us?Leave a comment:
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Re: Does power supply have to have metal case?
It's general purpose SMPS from china. You know one that is used for LED lights, 3D printers etc.
How well do those frequencies go through wall? Would it kill neighbours radio/wifi behind concrete wall?
What's the exact frequency? The same frequency as switching?
Aluminium tape sounds good idea.
I dont even have radio at home so I have no idea how to verify if I have enough layers of aluminium foil. And if I put 2 large fans on top then the top of it...Leave a comment:
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Does power supply have to have metal case?
Hi!
I was thinking of making custom case for power supply. It currently has one small 6 cm fan which needs high rpm in order to keep it cool. However this makes it noisy. I had a thought that I would 3D print a larger case that have 2x 12cm fans that I would run with low RPM to keep them quiet. I figured that it is easier to 3D print a new case than do it from metal because I dont have tools to make precise cuts, bend it to right angle weld screw mounts and so on.
Would something be wrong if I 3D print plastic case instead? For example is it required to shield from...
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