Hi!
I want to measure the heat of LEDs on my DIY LED panel with my infrared thermometer. That means that wrong emissivity could be like +/- 10 C in some cases. Should I take emissivity of white plastic which is 0.84 or are there any better options? Also does IR thermometer care if light from...
Just trying to understand how they work.
while someone else says this:
To me it looks like contradiction between 2 views here. One says that leaving CT open ended generates dangerously high voltage and while other explains why it would stay in mV scale. And it's bit confusing.Also an other...
Thanks, that explanation on how mV come was good. I just don't understand how the CT tutorial that I linked above got 76.8 kV and why some people on youtube warn against high voltage when CT is left open circuit? Are these cases just mistakes of tutorial makers or is there something that I may...
How many more times?
I read this page: https://www.electronics-tutorials.ws/transformer/current-transformer.html
Here it explains that when secondary winding becomes open-circuited CT secondary V = primary V times (turns on secondary divided by turns on primary). In case of 20/5 turns on...
Thanks for all the info!
This CT was around 240V cable. CT was 20/5 so I assume that it should boost the voltage 4 times if my understanding is correct. When I measured disconnected CT with multimeter it only showed few mV instead of 4*240V = 960V what I expected. The cable was running almost...
Hi!
I have question about current transformers (CT). I have BH-0.66 class 0.5 20/5 current transformer. According to my understanding 20/5 means 4 times current reduction. For some reason I get about 20 times current reduction. Now I am curious if the factory managed to label 100/5 CT as 20/5...
Ok, tnx. I also noticed that SG3525A is better documented. What do you exactly mean by direct replacement?
Also, which one should I get? SG3525A seemed to have a bit longer feature list so it looks like newer but I am not 100% sure. In other words replacing KA3525A with SG3525A should be fine?
Hi!
I need to replace KA3525A IC because I damaged mine with shorted potentiometer. I have question: I also has KH52AD marking on it. Is this also important? I can find KA3525A from aliexpress but KH52AD doesn't seem to show this unit. And when I search for KA3525A, also SG3525A seems to show...
Do you man that DC is is sent to transformer? Or what makes this DC to AC again in order to send it to transformer?
What do you mean exactly? As I understand, it is already rectified, but then it gets rectified again?
The input is always constant? It does not change with different output...
Contacted the seller. He forwarded my problem to factory engineer. Engineer said I could try to unplug the fan because the unit should be able to handle up to 600W load (of 2kW) with passive cooling only. Turned out that at 80W (11.7V*6.8A but probably transformer outputs 24V or something...
Would it help if I glued heatsinks on transformer's frame? From the one had protective layer of tape isolates some of heat too so efficiency would be reduced. Also I am not sure how much magnetic fields in transformer like it when there is heatsink attached to it.
The best would be 0 RPM mode...
No I would prefer not to do it. Just asked to get some more knowledge on this field. One thing is complexity, but other thing is that finding all the parts itself would already take like yer or so. But from the other hand if I want to get unit that can continiously supply 600w without any noise...
What would be the geed enough threshold for transformer? I mean some manufacturers have it set to 65C instead of 50C. But is it still healthy?
Or what do you think is 50C just right?
Yes, it is.
Yes, but shouldn't have much effect because the case already is of metal which conducts heat...
That happens. However it comes on already at low low. I am just trying to figure out how much load would it be realistic to expect SMPS like specified in OP handle before fan starts. As I have understood it's design flow if for 2kw unit 20W is already enough to need the fan but if it had not any...