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.
Iâd sure like to see these sold with a threaded retaining ring narrow enough not to short-circuit components to ground.
Or â at least â specifying the inner diameter required for a retaining ring, to be used with the driver. And selling the rings.
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 donât normally trust myself just eyeballing the package (although I do make a judgement). Thanks for the other info, thatâs somewhat interesting. Iâve always wondered how Nanjg ended up using the more expensive part and riding it to that kind of success.
Ack. Ordered 105c for 2 months and just looked at the pn to find it as a 105d.
Iâd 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?
Actually I had planned on using the stars to get low mode only and then do the testing. But now I donât have that option and Iâve got to order the new programmer⌠Assuming it can be. I havenât even looked at the chip. Still trying to chase down why the other driver doesnât lower the current after 10 ohms.
105D can be reprogramed, I know because I ordered 5 x 105 C â8 AMC chips and 5 x 105 C6 AMC chips and instead I received 9 x 105 D 8 AMC chips and 1 x 105 D - 6 AMC chipsâŚ
Stars are great soldering points if you use firmware for electronic switch which is what I neede them for I can still use them with electronic switch but it is a realy realy PITA to solder wires directly to MCU.
Yep. Iâm looking for a corny regulated driver with a sense resister that I calculated around 20 ohms. It isnât working. So Iâve a new one now to figure out.
Just extra trouble I didnât need in this job market.
When you need a regulated 1 ma sourceâŚ. For the first time I donât need more current. I need less. A lot less. Accurately less. No flicker pwm less.
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 Iâm saying! Why wonât 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, â17mm double-sided & 20mm+ single sided 4Amp+ linear driver [A17LDX]â. I suspect that this may do what you need.
I bought, paid for, and planned on modifying a 105c. I received something very different in the mail but didnât realize it because I wasnât 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 wasnât too concerned until this thread showed there was an E version with a different MCU.
You see budget FLASHLIGHT but Iâm 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 itâs very important.
My apologies for the chime in for an item I did not order.
I understand that you didnât get what you ordered. The lack of Google hits for 105d was part of why I saw fit to start this thread. That wasnât really my point though.
What I was getting at was more along the lines of âwhy donât you spill the beans and maybe weâll help you do what you at trying to doâ 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? Youâre still welcome to spill the beans and get help.
Error some of that is android and itâs wonderful auto correct.
There isnât really beans to spill. I work with photometrically sensitive films. The canât have any sort of exposure and they can only tolerate certain wavelengths.
So somewhere in the interpolated emission charts 1 to 10 ma would give me the desired photon flux such that a human eye can navigate under night vision but a radiometric sensitive emulsion would not appreciably fog.
Kinda a fun problem Iâve licked in the past.
Can always apply nd filters to the emitter to knock down the flux. Donât have any ideas yet until we measure how many photos actually will dog the emulsion.