Searching for 23mm driver

6 posts / 0 new
Last post
xkertx
Offline
Last seen: 6 years 1 month ago
Joined: 08/18/2015 - 14:34
Posts: 4
Searching for 23mm driver

Hi,
I am searching for a new driver for a noname chinese diving light (old driver is dead).
The flashlight has a 23mm driver and a magnetic slide switch.
It has 3xcree emitters and is powered by 2×18650 batteries.

I did not found any drivers with hall effect sensor built in.
But, would it be possible to add a hall effect sensor to a normal driver?
I have some S49E sensors that I could use – it has about 2,5v output when close to magnet.
Is there any (cheap) driver that can do it?

xkertx
Offline
Last seen: 6 years 1 month ago
Joined: 08/18/2015 - 14:34
Posts: 4

I could make my own driver also.
I have some ATtiny85-s laying around and a programming tool.
So I guess all I need is a constant current driver. Then I could read the hall sensor and use the PWM to change the brightness? Is that correct?

Can you reccomend a chematic for constant current driver that accepts two lithium cells in series?
I need about 2-3 amps current.

bmwsancho
bmwsancho's picture
Offline
Last seen: 5 months 5 days ago
Joined: 05/08/2015 - 12:56
Posts: 520
Location: California, USA & EU

I have not come across a 23mm driver, but there are 20mm ones. Alternatively you could use a partition board or build something like it. Finally, there are also a multitude of rings or adapters you could solder to a smaller driver.

It will take some effort but I am sure you will be successful.

re: hall sensor/magnetic switch; I am not capable of answering that one, sorry. But if the existing switch works you could adapt it to a driver that takes electronic switches, I assume?

ohaya
Offline
Last seen: 3 years 7 months ago
Joined: 03/16/2013 - 19:01
Posts: 5337
Location: US

lck-led has a 23.5mm driver:

http://www.lck-led.com/3000ma-driver-group-mode-p-1061.html?cPath=135

not sure if it would work with the extra 0.5mm diameter?

Were you the one that asked about this in a different thread?

I don’t know about the sensor though…

AlexGT
AlexGT's picture
Offline
Last seen: 1 day 22 hours ago
Joined: 06/07/2012 - 17:39
Posts: 4602
Location: Texas

MTN electronics has a 22 mm FET multimode driver I used to modify my TX25C2, might fit in there if you use a little extra soldering.

xkertx
Offline
Last seen: 6 years 1 month ago
Joined: 08/18/2015 - 14:34
Posts: 4

Today, when I woke up I got an idea.
What if I use some existing driver that is based on ATtiny – maybe there is unused adc inputs.
I could then connect my hall sensor to this pin and reprogram the mcu with my own custom code.

But what kind of driver I should look? What would be most efficient way to dim those LEDs?
Constant current or PWM?
And if using 3 x cree XP-L emitters in series and 2 × 18650 in series, should I look for driver that boosts the voltage up?