Electronics > Beginners
Turning a florescent replacement type A LED T8 into a type B
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dclevy1:
Oh yeah I understand completely but I do understand voltages and different amperage the harm they can cause bodily wise. I do know about different components and what they do and DC and ac voltage as well so I'm not a complete noob. What I don't understand is reverse engineering and how to really draw a schematic I understand the idea but not exactly how to do it. That's where I need you guys help but from there I know how to be safe with these type of things. But if I can make it easy on myself and find a supply from AliExpress or somewhere trusted that will get me by on my crazy projects that'll be great. Just to be 100% sure why do I need a constant current source.
--- Quote from: james_s on August 05, 2018, 04:21:13 am ---You'll need to reverse engineer the circuit and draw a schematic to see what it is. It looks like you're going to need a constant current source though, ie a ballast. That doesn't necessarily mean a fluorescent lamp ballast but you will need something to provide a constant current with the ability to supply at least 80V. If you don't know much about electronics though I can't say I recommend this project, it involves voltages that could potentially cause injury or death, and a fault due to a poorly designed driver could start a fire. Don't take this the wrong way as I encourage learning but this is one of those things where if you have to ask, you maybe shouldn't be messing with it.

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Kjelt:
I agree with james-s you end up with unisolated 80V drivers that can kill even with 50mA's.
I abandoned a project like this a few years back and redesigned it to 36V which makes it safe (cheap isolated dc power supply) and easy to make adj. current with a lm317.
Kjelt:
Normally these power supplies are fed with rectified mains busvoltages, that is around 360V for 230VAC in and from that busvoltage a dc-dc converter generates the 80VDC current regulated. If you look at the components used in a commercial supply to do this right it are two hundred components, microcontroller with software and at least a year of finetuning and testing, again: NOT recommended for DIY unless you work in the field and have plenty of experience.
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