- Joined Sep 25, 2015
I have a led lamp that I really like.
It was originally design to work on USB but I adapted it to work from a 5V power supply. All the adaptation I did to it, was to take out the usb, drag the wires out and connect them to my 5V power source. I install it to my electrical drill and to a 3 way switch. Everything worked very good for 1 year or so. I recently worked with a power tool that required a lot of power, a heat gun blower. It started to flicker when I use that blower. I originally thought are the leds, getting too hot and flicker from that. The lamp itself is getting hot usually. But now I thought this is it, too much hot for it and the leds are dying. If I leave the light off for a while, to cool down, it come in strong light as before. But after 1min or so of working, it start to flicker and fade to almost visible light. I figure out after a wile is my power supply. Today I change it with another one 5V 1.5A.
The old 5v PS had 1A and it was a power traveler - see picture:
I basically took out its board inside and reconnected everything to my needs. The white wires are the 220V wires. One of them is going to the switcher on the right, and one to the pile of wires in the left. I made a custom case for it, not to touch any metal inside.
I like this little board, because it fits very well inside that cramped space of my power tool.
Here you see it mounted back (and working fine now).
The new 5V board (no image), I took it from a transformer. But is a bit too big, and kind of fitted there to the limit. I liked the little one more because of it's space occupied.
I just look now, and the only voltage regulator that I have is LM317, but it works from a max of 37Vdc.
- My questions to you.
1- did my heat gun blower, created spikes that overwhelmed some components in my transformers? I notice a dim and very high pitched noise from another transformer on my table that is always on. It might be from that blower as well, or it is a coincidence.
2- Can you give me a circuit for a transformer, from 220V AC to 5V DC at 1A or 1.5A ? For the moment, the size doesn't matter. I want to see if I can make one and what components it takes. Also with good protection for mains spikes.