Emisar D4S review

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Tom Tom
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ZozzV6 wrote:
I really like the flashing through VIAs solution. I hope BLF driver designers will copy this idea in future designs. I really like to see fet+1×7135 drivers for E-switch lights like this and easy swap firmwares.

Yes. Make it a standard footprint please, then we can have a (3D printed ?) pogo pin adaptor to replace taking the thing apart, cobbling up a power source, and so much fannying about with dodgy clips, individual wires that have to be connected up the right (mysterious) way, etc.

MCUs are not going to have leads soon for clip attach, at least not the ones worth considering. True leadless SMD, BGA, …

We got past this years ago with I2C/SPI debugging. I’m a bit out of touch these days, but I’m sure there has been progress.

Done properly it could be liberating for those who are intimidated by the mystique of code development, nevermind simple re-flashing.

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Tom Tom wrote:
ZozzV6 wrote:
I really like the flashing through VIAs solution. I hope BLF driver designers will copy this idea in future designs. I really like to see fet+1×7135 drivers for E-switch lights like this and easy swap firmwares.

Yes. Make it a standard footprint please, then we can have a (3D printed ?) pogo pin adaptor to replace taking the thing apart, cobbling up a power source, and so much fannying about with dodgy clips, individual wires that have to be connected up the right (mysterious) way, etc.

MCUs are not going to have leads soon for clip attach, at least not the ones worth considering. True leadless SMD, BGA, …

We got past this years ago with I2C/SPI debugging. I’m a bit out of touch these days, but I’m sure there has been progress.

Done properly it could be liberating for those who are intimidated by the mystique of code development, nevermind simple re-flashing.


Exactly that is what I’m thinked about! Big Smile
Make the flashing pads position to standardized distance and orientation from driver center and I can 3D print a 18650 bar style pogopin holder and with a 26650 adapter tube it can put in also the D4S. the one thing it needs a hole or some orientation locking thing what prewents the flashing adapter to rotate where the pins doesn’t hit the pads. I can make the 3D printed part with pogopins and sell them completely built if it is a request later Wink I can make the pins replaceble too.
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I’m not queueing to get one largely because it is too large for my EDC while not matching any of my non-EDC uses well enough.
I find the aux LEDs a very interesting idea. It’s been mentioned before, but I haven’t seen it implemented before. Would like to see it….I guess I’ll have to wait.

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Can somebody make something similar PCB design like this AUX led board for a D4? Lexel maybe? the pin is on the driver. just need two extra wires and an Andúril firmware.

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DB Custom wrote:
Why not vresto? A belt sheath will put it at hand at all times and you’ll forget it’s there til you need it. Kydex or Holstex can easily make a horizontal holster to carry it on the belt or the hem of pants or shorts, works very well.

Edit: Know any LEO? Ask them what they carry every day….. come on man, Cowboy Up! Wink

Hahah yeah.

Still an EDC for a LEO in a belt holster is not quite the same as what I would consider an EDC in the pocket of my slacks.

I have a DQG Tiny IV 26650, which is smaller than the Emisar D4S, and I would not consider that DQG viable for pocket-EDC. It’s way too heavy and bulky.

I’d like to see a new aluminum version of the D4 that incorporates some of the improvements in the D4S, such as:

  • recessed button
  • square knurling on battery tube
  • vias for reflashing driver.

anycolourfloyd
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I would also like to see square knurling on the d4. Much much prefer some form of knurling with smooth ano

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Now I want those improvements on a D4v2…
Orange secondary LEDs would give a BOSS style on this budget light !

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X3 wrote:
Now I want those improvements on a D4v2…
Orange secondary LEDs would give a BOSS style on this budget light !
YES! D4v2 please! Silly
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Excellent . I really appreciate the comparison at the end of the review.

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Count me in, if D4V2 happens. I prefer 18650’s.

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After thinking about this light some more, I have to agree that 20700 would be the better battery format since basically none of the big battery companies make a 26650 that I can see. But I guess it should be possible to adapt from 20700 to 26650 size slot to use one in a D4S. Might have to find someone to print an adapter though, I’m not finding anything commercially available.

Edit I’m an idiot, 20700 is longer. Damn.

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Some of the protected 26650 cells are 700mm long. I doubt this light was designed to work well with protected cells but I wonder if some thought was put into accommodating some of the larger/longer cells and if they could work with a 21700 or 20700. The D4 doesn’t seem to have extra long springs, but perhaps this one will…

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Nice detailed review TK.

 

This sounds like a first class light. I am looking forward to it. I like the idea of the "SAFE" blue LEDs.

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ZozzV6 wrote:
Can somebody make something similar PCB design like this AUX led board for a D4? Lexel maybe? the pin is on the driver. just need two extra wires and an Andúril firmware.
You could simply glue the LED to the MCPCB or solder one end of a LED to a power pad at the MCPCB as I did in my Green Lantern.
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Very promising indeed. I’m in for one for sure.

The ~20 years runtime on aux LEDs (low) is already the dealbreaker for me…

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Firelight2 wrote:
I have a DQG Tiny IV 26650, which is smaller than the Emisar D4S, and I would not consider that DQG viable for pocket-EDC. It’s way too heavy and bulky.
Is there really a new version of the DQG avaible? I have only seen V3 up to now.

I also consider the D4s too big compared to the DQG, and would have preferred a 7 LED variant. Now I have to use the DQG for my planned RGBA + 3x white build – which is way more difficult due to the serial LED setup and the driver design.

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ikkentobi wrote:
Very promising indeed. I’m in for one for sure.

The ~20 years runtime on aux LEDs (low) is already the dealbreaker for me…

It’s probably worth noting that the li-ion cell’s self-discharge rate is faster than that, so it probably won’t actually last 20 years per charge. But if the driver and LEDs were the only source of drain, it looks like it should last a couple decades based on how low the power draw is.

Effectively, there is no difference in terms of battery life between the low aux LED mode and off.

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Agro wrote:
I’m not queueing to get one largely because it is too large for my EDC while not matching any of my non-EDC uses well enough.

Yeah, same here. 1×26650 is simply too big for me to carry around all the time. Otherwise it’s a nice light though.

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Not every flashlight has to be “edc”-small. This looks like a fantastic light for a backpack/bag, car, maybe even jacket pocket carry for an outdoor event. I’m into it.

Lexel
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ZozzV6 wrote:
Can somebody make something similar PCB design like this AUX led board for a D4? Lexel maybe? the pin is on the driver. just need two extra wires and an Andúril firmware.

it is possible if I have the measurements of the Noctigon boadrs
I made very similar in this build

sanded down 0.8 to 0.2mm

thermally glued not needed on aux LEDs

0402 and 0603

with balance resistors and LDO so each LED could be another color and constant brightness over whole battery voltage

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Perfect, now I want some orange aux LEDs on my D4 Facepalm

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Lexel wrote:

it is possible if I have the measurements of the Noctigon boadrs
I made very similar in this build

sanded down 0.8 to 0.2mm

thermally glued not needed on aux LEDs

0402 and 0603
!{width:50%}http://www.metronixlaser.de/bilder/flashlight/D4_aux0603.jpg!

I have a D4 MCPCB at home. I will measure it just tell me what dimensions you need. In D4 the screw holds the MCPCB and two legs of the optics resting on the screw. So if we make like D4S and same screw holding down the aux pcb you need to cut off more from the legs on screws. Maybe you need use longer screws also.
Edit: I think less leds are also enough. like 6 or 8.

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Lexel wrote:
ZozzV6 wrote:
Can somebody make something similar PCB design like this AUX led board for a D4? Lexel maybe? the pin is on the driver. just need two extra wires and an Andúril firmware.

it is possible…


with balance resistors and LDO so each LED could be another color and constant brightness over whole battery voltage
!{width:50%}http://www.metronixlaser.de/bilder/flashlight/D4_aux_balance.jpg!


Ummmmm… Yes, please!
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looks great, a green would be nice to my green 18650. I hope price will be around 50$ or so but who knows..

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Tom Tom
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Lexel wrote:
ZozzV6 wrote:
Can somebody make something similar PCB design like this AUX led board for a D4? Lexel maybe? the pin is on the driver. just need two extra wires and an Andúril firmware.

it is possible if I have the measurements of the Noctigon boadrs
I made very similar in this build

sanded down 0.8 to 0.2mm

thermally glued not needed on aux LEDs

0402 and 0603

with balance resistors and LDO so each LED could be another color and constant brightness over whole battery voltage
!{width:50%}http://www.metronixlaser.de/bilder/flashlight/D4_aux_balance.jpg!

Holey moley!

Just because you can draw something doesn’t necessarily mean it can be made.

Try snapping that one out of a biscuit. Nevermind routing out all the big holes.

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I’d love me one of those boards to pimp my D4 Party

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I am in contact with Intl-outdoor so they should become availiable fully assembled from him

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Cool.

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Lexel wrote:
I am in contact with Intl-outdoor so they should become availiable fully assembled from him

Cool!
But I would like to choose my own leds of course, so I would not mind an upload on Oshpark too (or don’t they do such thin boards?)
Lexel
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djozz wrote:
Lexel wrote:
I am in contact with Intl-outdoor so they should become availiable fully assembled from him
Cool! But I would like to choose my own leds of course, so I would not mind an upload on Oshpark too (or don’t they do such thin boards?)

Oshpark 2Oz are 0.8mm thin, this should be enough
on chineese fab on panel I would go to 0.6mm

also made a programming adapter for my future drivers
same order in 2 Oz!

Fits those pogo pins from banggood
https://www.banggood.com/100Pcs-P50-B1-Spring-Test-Probe-Pogo-Pin-Dia-0_...

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