Unknown Surface Mount Component

[EasyGoing1]

Re: Unknown Surface Mount Component

wont work, it has to be electrically conductive to carry the negative rail.
it also has to support the spring pressure against the battery.
i also doubt it's a good idea to use anything that softens if it gets hot!!


a machined aluminium ring may work, i was just going to mount the 17mm board against the 20mm one.

They make conductive PLA, and it only softens around 190C

[stj]

Re: Unknown Surface Mount Component

still probably not strong enough to have an 18650 rammed into it for years.

i think the simple answer is to strip all the parts off the 20mm board and fit the 17mm one against it.
i'll try it when i get a couple.

[EasyGoing1]

Re: Unknown Surface Mount Component

still probably not strong enough to have an 18650 rammed into it for years.

And the beauty of 3D printing is you can just print another one if something goes awry ... or print 10 and throw em in a drawer...

I'm not sure how strong the conductive PLA is, since it is doped with metallic particles, I would assume it's stronger than standard PLA ... ABS is stronger yet, but I don't print with ABS cause its a pain in the ass. :-)

[stj]

Re: Unknown Surface Mount Component

if something goes awry you risk the 18650 turning the light into a pipebomb - no thanks.

conductivity would need to be pretty miraculous too - your pushing 1-3A through it and dont want any volt-drop.

[EasyGoing1]

Re: Unknown Surface Mount Component

and dont want any volt-drop.

Yeah I couldn't imagine doped PLA at that amperage NOT producing a voltage drop... but I've not messed with it yet...

[EasyGoing1]

Re: Unknown Surface Mount Component

https://www.aliexpress.com/item/10PC...913098686.html

They finally showed up today ... I have tried 6 of the 10 and NONE of them have worked ... kinda pisses me off.

[stj]

Re: Unknown Surface Mount Component

show your circuit.

[sam_sam_sam]

Re: Unknown Surface Mount Component

Here is the data sheet for this device AMC7135PKFT

https://cdn.badcaps-static.com/pdfs/...f2c52ececb.pdf

Does take a little time to load the page

I am going to give these a try and see if I make a big Big LED light with them

[stj]

Re: Unknown Surface Mount Component

i posted that datasheet on the first page.

[EasyGoing1]

Re: Unknown Surface Mount Component

show your circuit.

Here it is

[stj]

Re: Unknown Surface Mount Component

your led is backwards, the chip regulates the negative rail.

[R_J]

Re: Unknown Surface Mount Component

here is the pdf

[EasyGoing1]

Re: Unknown Surface Mount Component

your led is backwards, the chip regulates the negative rail.

I JUST NOW took a closer look at the schematic on the datasheet and saw my error... they work just fine.

[stj]

Re: Unknown Surface Mount Component

lol

so how many will you use?
given we dont really know much(anything) about the led?

[EasyGoing1]

Re: Unknown Surface Mount Component

lol

so how many will you use?
given we dont really know much(anything) about the led?

So I did use a CC power supply and set it for 4.2 volts at .5 amps, and it powered the LED just fine (and it damn bright which was wonderful) ... When I connect the LED using the AMC7135 and a 18650 battery, it draws about 360ma ... I'm not sure how quickly it will drain the battery at that amperage, but I'm thinking it would be pretty fast, so adding another 7135 would definitely make the light brighter, but it would also drain the battery faster ... now I'm not necessarily opposed to this because the battery is easily recharged and I certainly have enough of them laying around ...

What would you do?

[EasyGoing1]

Re: Unknown Surface Mount Component

lol

so how many will you use?
given we dont really know much(anything) about the led?

I just re-assembled the flashlight with the new LED and just one 7135 and with a newly charged 18650, its EXTREMELY bright ... much brighter than it was before. The only weird thing about it is when I turn it on, it starts out extremely dim then SLOWLY gets brighter ... is there something connected to the push button that is causing this?

[EasyGoing1]

Re: Unknown Surface Mount Component

Why not? Do you not know the Voltage source, the load current, etc.?

Budm, you never did tell me if my calcs were accurate ...

[stj]

Re: Unknown Surface Mount Component

interesting, if it is your switch then it could be getting warm.
i find with the really cheap chinese lights with a clicky tailswitch you sometimes have to give them a blast of contact-cleaner.
or poor battery contacts?

[stj]

Re: Unknown Surface Mount Component

When I connect the LED using the AMC7135 and a 18650 battery, it draws about 360ma ... I'm not sure how quickly it will drain the battery at that amperage,

battery capacity divided by 360.

id your battery here:
https://secondlifestorage.com/celldatabase.php

[sam_sam_sam]

Re: Unknown Surface Mount Component

id your battery here:
https://secondlifestorage.com/celldatabase.php

Thank you for the battery information post this will help me a lot