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Org Hijack jEmplode emphatic Repairs: Eutronix Cases You are not logged in. I have a curious case of a lighting controller that’s designed to work with these types of lights but seems to be implemented completely incorrectly.

The lights are the variety that come on a reel and are often sold in a kit with a 12v power supply and a remote-controlled RGB controller to change colors and turn the strip on and off. The controller I’m having the issue with is a separate product that provides some of the same features but can also automatically change the lighting in reaction to sound. It has common voltage, and each terminal for RG and B are then tied to ground, first passing through some bits on the circuit board 1 transistor each, plus some resistors, then tied to a small IC to reduce the voltage on input from the remote.

And of course the LED strip will not light up this way.

KIA50N06 (ETC) PDF技术资料下载 KIA50N06 供应信息 IC Datasheet 数据表 (3/9 页)

Which leaves me with a giant WTF!? Reversing polarity on the power supply doesn’t work to remedy the problem – no voltage can be measured on the board this way. Might this be a matter of flipping around a few components to get this to work? I only see 3 diodes on the entire board, one big through-hole and two smt. I purchased this stuff from two sellers on Amazon, but I notice that the seller I bought the strip from also has the exact same controller on their web site.

Fine Mac OS Software.

Already wrote to both, but no reply. I’m expecting to get back messages from each telling me that they can’t help because both sets of parts didn’t come from them. I just don’t know how this controller would work for anything. One way to salvage the situation would be to add three more power transistors PNPone in series with each of the existing R-G-B trio on the controller board, except selected and wired to reverse the voltage output.

Those will likely need a pair of resistors each to scale down the ouput of the existing transistors to levels that can be used to control the add-on ones. This one from DX. The LEDs are all wired in parallel and connecting the wires to the other end doesn’t have a different effect.

It’s the same from either end. I’m going to take some photos of the strip and controller PCB and post them up. In the meantime, found the same controller on Alibaba: Here are some images. Hope the traces and labels are easy enough to see. What’s the number on those transistor-like drivers? I cannot make out the part between the first “K” and the “A”. Mark, it’s an “I” capital i Peter, I did write to the supplier, Hitlights. Since they also sell what looks like the exact same music controller, I asked about that too, so we’ll see what they come back with.

Just saw the diagram Mark. I see you’ve made enough mods to rewire the polarity on all the terminals. I’m going to give this a shot – I think my soldering skill should be good enough with these large targets. Any recommendations on how to best cut the traces on the board?


Scrape them with a nail?

Actually, the part I’m most worried about is soldering wire to points on the board where there aren’t any existing pads marked in green. Should I just scrape up a small area for the wire?

Note that you can actually do the soldering at any existing blobs within the same strips, rather datasbeet having to scrape away a lot of green stuff to do them exactly where shown. Great, mostly what I was thinking as well. I just hadn’t taken the time to look for pads to use for the areas marked in green the kia0n06.

It’s early enough that Datasneet will probably try this today after a bite to eat. If you do the red wires directly to the existing blobs, then use three individual wires, one for each transistor.

That will be easier than trying to daisy chain a single wire vatasheet I drew above. Ok, just finished cutting the traces – before I saw your tip. I did something similar, but scraped the copper off dztasheet the two lines. Yeah, the same one I use for carpets, kia550n06, etc. I tested for continuity before and after every cut to make sure that I was making a clean break. So far so good. I’m not sure I can scrape the green stuff off of a flat area well enough to leave a surface suitable for soldering A Dremel tool with a small grinding head might work for scraping.

Even if the solder has a flux core. Don’t have kia50n60 flux right now, but the flux-core solder worked well enough. Pre-tinned all the wires and didn’t have any issues. I did three red wires as suggested and the point where all three attach is the ugliest part of the whole re-work Everything seems to check out, but it’s not working. The top two blue wires measure 4v and the bottom 2. In other words, backwards from how the FET would normally work.

The current flow is from Drain to Source in the original circuit, and it remains that way in the modified circuit unless I’ve goofed. So it should work. But you did say earlier than you’d tried it with the power supply polarity reversed, and perhaps that damaged the controller?

50N06 Datasheet(PDF) – Unisonic Technologies

I’ll look at it again and think about it some more. But a place to start is disconnect the LED strips, and then tell the controller to “turn everything on”. Then measure the Drain Gate voltage at each transistor, the three readings should be identical. The controller didn’t get damaged – I checked voltage was working remote operated before doing the rework.

I’ll check the gate voltage next. These devices can be made in either polarity. Some conduct from Drain to Source, and others go the other way round.

The modified circuit doesn’t change that in theory. It should all still have exactly the same voltage drop between Source and Drain as it had before, but now there is going to be a different voltage between Gate and Drain than what was there before.

One side of each resistor connects to the Gate, but I cannot see where the other side connects. Have a look and figure that out for us, will ya? If they connect to what used to be the big fat ground trace, then that’s the problem.


You’ll need to somehow restore a true ground to that side of each of the resistors. Note that you can hook up one of them to try first the top one in the photo, perhapsand then do the others only after verification that things are working. To repair the cuts, just scrape some copper bare on each side of the cut Dremel tool?

Then solder it in place. Gate voltages are different now. All three still read differently. Continuity is broken and connected where it should be as per the newest diagram. Well, it is possible that Gate-to-Source voltage “matters”, then. I don’t know enough about that stuff. Actually, if you want to pursue this further, we should be able to calculate the correct resistance values, and it might work out that only the larger three component side of board resistors datashfet changing.

To do this, we need to know what resistance values the three tiny ones copper side of board have, and similarly for the three larger component side resistors. And measure the voltage input into the larger resistors from the chip that controls them. It might work out nicely, or not. The voltage we need is whatever is appropriate to achieve the correct Gate-Source differential for the transistor. Dtasheet don’t know that value no datasheetbut we can figure it out kiaa50n06 the measurements above and those already posted earlier.

I don’t have any spare resistors around here, so unless I can extract some suitable ones from some other piece of junk kit I might have lying around, it means I have to go out and get them. But, for shits and datasheft, let’s see if this makes any sense The SMT resistors say “” on them. The ceramic ones are ohms according to an online calculator. I don’t think you will be able to get it to work without some more datasneet. The 10k resistor is a pull-down resistor and the ohm resistor is just protection for the uC.

Datashfet it’s connected to the anode-side of the LED, as the modification is doing, you would still need V difference between source and gate, but now you have the LEDs raising the reference for the source and you will never get more than 5V out from the uC, making it not work. We come across this every so often, we supply equipment that drives the LED signs you see by the side of the road. To be able to drive the common ground configuration, we datssheet to supply an adaptor board which like StigOE points out, has the “opposite” FET configuration.

KIA50N06 PDF Datasheet浏览和下载

The guy I bought the controller from says all his LEDs datasheft common voltage – haven’t heard back from the other person yet.

I think the easiest thing to do at this point is to rework the board back to original function before it gets too complicated to do so, and pick up second set of LEDs.

I can hopefully pass the current set along to a friend kix50n06 doesn’t need to use the alternate controller.

Everyone, especially Mark, thank you so much for the assistance. Even though the rework didn’t work, it was fun to do and good practice.