Dive light on/off switch problem&question

[Arse]

Hello from Finland fellow divers I recently bought a second hand dive torch (Suunto Finnlight F100) which I'm now modding to be a led light. The problem I have since I have to scratch the old electronics (due to different voltages and other stuff) is that the original on&off swithes are made with magnetic push buttons (separate on and off buttons which bounce right back up after pushing down)

How could I use these buttons or one of them to turn the light on and off...I've once made a FET & Reed magnetic switch but it doesn't "hold" the state (the magnet has to be there all the time) like the one I'm now in need of. I need a magnetic switch system that turns the light on when pushed down (and then the magnetic button bounces right up) and turns the light off when pushed down again.

I'd really appreciate if someone knows how to implement this kind of electronics to my lamp. thanks in advance for resolutions.

 

[Ed Palma]

My DIY divelight uses a circuit like that. What you'll need is a latching circuit to allow a momentary-on switch (like your reed) to work and stay on.

I tried searching for a stock photo of your light and came up with this one:

Could you post a photo of the switch of your light?

 

[Arse]

Hi and thanks for a quick reply. I'll post some photos of the light (switches) tomorrow.

 

[Arse]

Here's some photos of the switches. You can see the two blue reeds on the circuit board that react to the two buttons (on & off)



So the question is how do I make the latching circuit from scratch with a reed (I have spare reeds so I don't have to use those in the old circuit board)?

 

[Ed Palma]

What voltage does the current circuit run on? Do you have a specific LED module that you would like to use? Because it might be easier to work with the existing electronics and battery pack than to start from the other end. Just a thought

 

[Arse]

Hi. The original battery is 14.4v and the new one will be 7.2v. I ordered a drop-in led module running 8.4v at the most. The point of changing the battery is that the original one is half dead (and of course the led voltage too)

 

[CuNanoTube]

Your best bet is a latching circuit. You can probably find one pre-mad online if you need a smaller size. Unfortunately I have no experience building one IRL, but I have made a few in minecraft.

You should also look "Dive Light Genie" they are pretty good voltage regulators that could possible work off of your existing battery.

 

[lucca brassi]

Maybe you can use original driver with some modifications - but it will be needed much better photo for reverse engineering. uC have for sure some voltage regulator for lower tension and it gives for sure some PWM on output pins (if have multimode system) , you can drive led by adding some MOSFET current drives or simple resistor (paralel for needed current) in series with led on output pins from existing driver
AMC7135@1400mA
A lot depends what you want and which led you'll choose.

put PCB from both sides on Scanner with high resolution output

 

[Arse]

I'd prefer making a latching circuit myself because then I can change the torch to use whatever lightsource (upgrading the leds and battery) in the future without having to hassle with the hard-to-figure-out circuit board...

 

[Ben Dugger]

Years ago we used "inertia switches". One takes a bat handled switch mounted inside the housing and attaches a small weight similar to a small hammer . Swing the light against the hand turns it on, swinging against the other turns it off. Also since there is no penetration of the housing it reduces potential leaks.

Ben Dugger