New 105D. replacing Nanjg-105c @ FT? (no stars!)

I was wondering how they achieved such good spacing from the edge… 20mm explains it.

I ordered a couple of these to try from FastTech:

https://www.fasttech.com/p/1127403

8x AMC7135 generic driver with star-selectable mode groups:

A couple of interesting observations; the spring is much larger, making it much more useful than the factory spring on the 105c. Also, the above pic from FT doesn't show it, but the stars are printed in two pieces, so you just bridge the two halves to make your mode selection. I haven't installed one yet to check how the PWM, fit, and mode groups work out.

I’d sure like to see these sold with a threaded retaining ring narrow enough not to short-circuit components to ground.
Or — at least — specifying the inner diameter required for a retaining ring, to be used with the driver. And selling the rings.

ardvaark @ FT says that it’s not an ATtiny13A (pulled it off the board and USBASP wouldn’t play with it). - http://www.fasttech.com/forums/1127403/t/1002171/attiny-mcu

Yeah, you can see in the pictures that it's not an attiny. There are also cheaper ak-47 and ak-101 drivers out there that are nearly identical, except for the MCU. Apparently the "a" in ak-47a and ak-101-a stands for 'Atmel' or 'attiny'. When I was looking at having custom drivers mass produced, you can save about $0.50 per driver by using one of the cheap MCUs vs. an Atmel.

I don’t normally trust myself just eyeballing the package (although I do make a judgement). Thanks for the other info, that’s somewhat interesting. I’ve always wondered how Nanjg ended up using the more expensive part and riding it to that kind of success.

[quote=wight]

A shipment of Atmels fell of a truck perhaps? :wink:

Ack. Ordered 105c for 2 months and just looked at the pn to find it as a 105d.

I’d been planning on using another driver as an ultra low power led flashlight. No go with this one until I either reprogram it or figure something else.

Boss is gonna be annoyed… Promised him 10x led flashlights almost a month ago.

Anyone know of another good low power driver that I could get down to about 10ma or lower and no blink./pwm?

You haven’t mentioned what makes the 105d unsuitable for your purpose.

To get down to 10mA you would have to reprogram anyways, so what's the problem with the 105D?

boss likes to have stars on his drivers :smiley:

Epic reply:)

Actually I had planned on using the stars to get low mode only and then do the testing. But now I don’t have that option and I’ve got to order the new programmer… Assuming it can be. I haven’t even looked at the chip. Still trying to chase down why the other driver doesn’t lower the current after 10 ohms.

There was never a ‘low only’ star on either the 105c or 105d.

Did you mean to say 10 ohms? I can’t think of any situation where 10 ohms makes sense in this context!

105D can be reprogramed, I know because I ordered 5 x 105 C –8 AMC chips and 5 x 105 C 6 AMC chips and instead I received 9 x 105 D 8 AMC chips and 1 x 105 D - 6 AMC chips…
Stars are great soldering points if you use firmware for electronic switch which is what I neede them for :frowning: I can still use them with electronic switch but it is a realy realy PITA to solder wires directly to MCU.

Yep. I’m looking for a corny regulated driver with a sense resister that I calculated around 20 ohms. It isn’t working. So I’ve a new one now to figure out.

Just extra trouble I didn’t need in this job market.

Lol 20 ohms sense resistor :bigsmile:

When you need a regulated 1 ma source…. For the first time I don’t need more current. I need less. A lot less. Accurately less. No flicker pwm less.

It’s hard.

It seems that you are seriously misunderstanding something or multiple things.

  • None of the drivers being discussed here would ever do what you want. If you purchased a 105c for accurate 1mA output you made a mistake. This is not the thread you are looking for.
  • What driver did you attempt to use first? 20 ohms suggests an extremely low sense voltage!
  • I question the need for an accurate 1mA supply for an LED What could you possibly be doing? It seems odd is what I’m saying! Why won’t a very rough, approximate, 1mA be good enough?
  • Is an accurate 1mA really that difficult? There are many multi-channel LED driver ICs intended for that range. Surely some of them must have tight enough regulation for your purpose?
  • Also take a look at the first link under WIP in my sig, “17mm double-sided & 20mm+ single sided 4Amp+ linear driver [A17LDX]”. I suspect that this may do what you need.

Actually Google led me here.

I bought, paid for, and planned on modifying a 105c. I received something very different in the mail but didn’t realize it because I wasn’t in a position to work on it. Instead I got a D version with some pretty different characteristics.

Since it was my backup plan, I wasn’t too concerned until this thread showed there was an E version with a different MCU.

You see budget FLASHLIGHT but I’m intending the use for another effort. Yes I can get access to ICs that have lower currents but they require a PCB and fab time.

As for the precision… I realize the number of lumens or photons emitted might seem imprudently emphasized. What I work with for prototyping it’s very important.

My apologies for the chime in for an item I did not order.

I understand that you didn’t get what you ordered. The lack of Google hits for 105d was part of why I saw fit to start this thread. That wasn’t really my point though.

What I was getting at was more along the lines of “why don’t you spill the beans and maybe we’ll help you do what you at trying to do” since it seems that your efforts so far have been pretty far off base. You also specifically said flashlights in your first post. Come to think of it, you also said 10mA, then later said 1mA? You’re still welcome to spill the beans and get help.

The E version does not have a different MCU.