KevinAlaska said:Hello and thank you for reading my post first off. I have a photo link of a very small circut board that shows off a few components that I want to purchase but I am afraid to order anything because I lack the knowledge to make sure they are the correct components.
I also need to find a good place to buy them if anyone knows of somewhere good. I probably only need like quantity 25 each of the 4 prime components on the board the other two are just resistors.
Link is:
https://farm2.static.flickr.com/1268/543321479_561182f163_o.jpg
I have a question on first the capacitor. I think I found the following item and here is a link to a datasheep that seems like it. The text on the capacitor reads 474k and below that it reads 250V. I am also guessing that it is a capacitor. The link to the possible item's datasheet is next.
Link is:
https://www.alldatasheet.com/datasheet-pdf/pdf/179980/NTE/MLR474K250.html
The second part is the little IC that has only 4 prongs coming off of it on to the circuit board. The following is the link that has a list of 7 items that could be all the same IC or all different. I was hoping someone could tell me. Here is the link to the possible IC's datasheet.
Link is:
https://www.alldatasheet.com/view.jsp?Searchword=DB107
The last object is the LED. It is a rainbow LED which I know little about. The colors fade in and out kind of slowly maybe 1 color every 1 to 2 seconds. This is all of the main components that I can see besides the resistors and next which is the small electrolytic capacitor with 100micro farads and I think it listed 16v (is that 16 volts?).
I love this circuit and I really want to make it over a few times if possible. I can't belive it is UL listed and runs so simply off of a standard US 120volts AC outlet.
Well any help would be AWESOME. thanks again to everyone for the help.
Sincerely,
Kevin in Alaska
The two wires just lead straight to a 120VAC us household style outlet. There is another small resistor on the bottom of the picture that read "brown, black, green, gold" so I thin that is 1,000,000R I believe? Seems high though. the lighting I had was yellowish and planned on checking that one closer before I did anthing.Important as there is no mains isolating transformer this pcb could be 'live', that is at mains potential, depending upon the mains connection.
Where do you see the UL certification mark??
Hi KevinKevinAlaska said:Wow... great feedback... And thank you so much for it.
The two wires just lead straight to a 120VAC us household style outlet. There is another small resistor on the bottom of the picture that read "brown, black, green, gold" so I thin that is 1,000,000R I believe? Seems high though. the lighting I had was yellowish and planned on checking that one closer before I did anthing.
This mark is on the outside of the plastic housing of the unit that plugs in to the wall. Just RIGHT beside the plug on the Right hand side of the unit. This is just a little plug my son uses that lights up fiber optic like strands via the rainbow LED.
Does the location of the UL mark mean anything? Why did you ask that?
Sincerely,
Kevin in Alaska
PS... thanks again!
Hi Kevin
If the unit is sold enclosed in a 'sealed' plastic box, thats probably why it carrys the UL certification mark. [its safe] . Once you remove any plastic housing its no longer safe to use.
It sounds like a 1M resistor, it could be across the 0.47uF cap
KevinAlaska said:Yes it was sealed in a clear plastic (need a knife to open) package when I purchased it... only screw to actually open the housing up and 2 smaller screws to unmount the pcb off the inside of the housing.
So last question is ... do you know of anywhere on the internet I can purchase some of these components and if so where?
thanks a mill...
Kevin in Alaska...
PS... I have seen other posts of yours on here. You are very good at your answers. Can I like suck out the knowledge you possess in electronics... it would sure save me a heartache!
Cheers!
is there a way of finding out on the LED? I can not see any images or printing. I can take it into the next room and inspect it further with much better light and maybe something to magnify it?Let me know what type the rainbow LED is, if you can find out?
Dont worry about me helping out, just 'chill' out [thats a little alaskan joke].
Do they have herds of turtles in Alaska??
You spoke of a BLINKING led, the current consumption will be
approximately half of a normal led. This will cause the voltage accross
the 100 µF capacitor to rise until it blows up. After that it's the blinking
led's turn for it's final blink ! If you add the zener diode the excess
current will flow through this zener diode and the voltage build-up
accross the capacitor will be limited by the zener diode and nothing
will blow up.
I added the schematic of the 5 volt power supply to demonstrate
that even a power supply with no load at all won't blow up if you add
a zener diode.
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