Review: KD 7135 V2 drivers 3040/2280/1520 mA with mode configuration

You do the same on the Nanjg 105C, set the modes yourself or even write new ones in the Atiny chip.

Actually I do not find useful the blink modes or the crowded modes on this driver.

Thanks for the review, sixty545!

Do you think it can work well with 3xAA configuration, as in the MCU-C88? Most likely Eneloop or Energizer Ultimate batteries.

The medium-high-blink mode could make a perfect keep-in-car flashlight, but if the low isn't too low to read a map, the default mode could also be great for this use.

Writing new ones in the Atiny chip? sounds complicated!

at least looks like you need to have more tools than the usual screwdriver and solder iron

You don't need more tools, just the corrent tool. There's a whole thread going on for a year now, only regarding that matter. https://budgetlightforum.com/t/-/744

The same soldering iron for changing modes on the Nanjg 105C, you need also for this new driver available on KD. You don't need a screwdriver :)

I could only get 2Amps from my equipment because of resistances in battery, leads and switch. But I am confident that the driver will deliver the full current when build into a flashlight. I checked the ratio between high and mid by observing the waveform in mid mode with an oscilloscope. It gave me about 33% (specs said 35%). The current waveform in low was really ugly, just some thin spikes at 15000 Hz resulting in a current of 5 mA of which the MCU uses 2 mA.

Sorry for the basic question but I want to drive a XPE R2 at close to 2 amps so can I use the 2280mA and simply unsolder one of the 7135 chips to give approx 1930mA? TIA.

Thanks for the reply sixty545.

I asked that becasue you know how specs are in general, they need to be tested. Even though the 7135 "35" chips have been proved until now, these are new and not proven yet.

2A it's pretty low so far. Hopefully someone mounts it in a flashlight and we'll get a "in the field" reading of the current.

That can be done, the resulting drive current will be 2280 - 380 = 1900 mA. I think I would choose the 1520 mA type as it is not a very easy task to remove a chip if you have not tried it before and the benefit of driving the XPE that hard is little. It can be done thougt with a heat gun with a small nose and pliers or with a medium big soldering iron, but it is easy to overdo the heating.

Awesome info. I had no idea these were binned...does each get tested individually?

Do you have any sources for the bare chips by chance?

Thanks for the review.

If you really want 2A it might be easier to just grab some of these.

Thanks guys, I'm not worried about giving it a try with the soldering iron and I quite like the user selectable modes so I'll give it a go.

Mine came the other day , got the 2A and 3A ones ..

Certainly look interesting ..

Id be most interested to know if the 3A versions actually test out at 3A. Do you plan on installing one soon? Are your 7135's also marked as "38K"?

Ive got my fingers crossed for this one. Lets hope it performs as expected.

What is that part on the left side of the solder pads? It is missing on one of my drivers.

That's a decoupling capacitor for the µC to stabilize it's power supply.

Probably works without it.

Thx

I got the 2280 mAh version today and just finished a dropin. Mine are marked 38K and I tested the dropin on high and got 2.274 A. So good news there.

The bad news is that the low mode is just two damn low. These needed to keep the low of the 105c (60-80mA) and then have the new moonlight mode (6-7 mA on this 2280 version) as an option instead of having 4 disco modes. So close and yet so far. I'm glad I have a reserve of 105c's.

Does this fit the "famous" UF-980L? (17mm?) Now that i have so many throwers, i'd like to give that light a new lease of life. The looks and built is pretty decent, but then the PWM turns me off.

I'll see if it fits the Yezl big head XM-L floody as well. That light is decent, and is a XM-L flooder, has a decent low but the 90Hz PWM renders it somewhat unusable.

Had a couple of the 8*7135 version arrive today. Both are 38K's

Thanks very much for the well done review! Frontpage'd and Sticky'd.