New display

Show and tell for your homebrew nv projects. DIY 'Stickies' here too.
lightmesser
Posts: 540
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: New display

Post by lightmesser » 07 Dec 2017, 09:27

MrNewbie wrote:With the front lens out, I tried.
T20 aspherical 28 or so lens..whatever is in a T20
38mm lens out of a 1503
Some junk store flashlight 22mm
Man you are wrong here.
T20 is 38mm
T50 or 1503 is 50mm (49,3mm)
And there is always possibility that you did not place them right.

They require some fine fiddling so for example when you building a flashlight you can't just stick them to emitter and expect they will work. You got to find x and y distance where it will perfectly focus and perfectly de focus emitter.

In this case we don't have to find x y point. We got to find X only... Point where it will enlarge object without any distortion or fish effect.

And of course not all lenses will work good. You have various choices of lenses and I really think that plastic flatter aspheric lenses should work the best so I already have few 25-28mm one on order.

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MrNewbie
Posts: 298
Joined: 22 Dec 2012, 21:28
Location: Grafton, Ohio USA

Re: New display

Post by MrNewbie » 07 Dec 2017, 12:36

You are correct,

I was way off on my lens sizes.
At least I threw out the T20 and unf1503 names, I wanted to try standard lenses that everyone has, or could get.

I just held them by hand in back of the screen to see if they worked a little bit.
It was my plan to build a little jig holder if I could get even decent results. The results were not good enough to warrant it.
With a 3d printer it would be real easy to make a holder for the x and y axis on any size lens.

I am kicking myself though, That little circle lens in the 3buck magnifying lens, I forgot to test it.

Before I get busted again... a minor update on the cell phone take apart of the unit.
1) pop the back cover off...be gentle with that ribbon cable
2) take out the 4 little screws that hold down the little screen (screen retainer)
3) Now the screen can be pulled out, try to avoid, but if it pops out its no big deal
4) Take out the 2 remaining screws, these 2 screws simply prevent the front end (lens) from unscrewing all the way.
5 )put the screen and 4 screws back in, pop cover back on.

Front end can now be unscrewed all the way
Even made cell phone vids, but don't bother watching unless above is unclear to you
https://youtu.be/PBSqH3brKNU

superslack
Posts: 78
Joined: 08 Feb 2016, 23:58
Location: Virginia

Re: New display

Post by superslack » 12 Dec 2017, 12:43

paulham wrote:Hi all. The display arrived this morning.
Bruce. Was the JST connector wired correctly?
I have plugged in a JST pigtail I have and the colours don't line upImage
I got my display off the slow boat. Mine looked like yours with the jst pigtail. I had already connected the pigtail to my voltage regulator with the black to the - and the red to the +. the display did not power up, but started getting hot. I swapped the leads on the voltage regulator and it powered up and worked fine.

The display is small!

has anyone popped the driver out of the back cover? I was thinking of mounting the back cover to a project box for a monocular.

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paulham
Posts: 1186
Joined: 09 May 2012, 12:35
Location: Potters Bar, Hertfordshire

Re: New display

Post by paulham » 12 Dec 2017, 12:47

superslack wrote:
paulham wrote:Hi all. The display arrived this morning.
Bruce. Was the JST connector wired correctly?
I have plugged in a JST pigtail I have and the colours don't line upImage
I got my display off the slow boat. Mine looked like yours with the jst pigtail. I had already connected the pigtail to my voltage regulator with the black to the - and the red to the +. the display did not power up, but started getting hot. I swapped the leads on the voltage regulator and it powered up and worked fine.

The display is small!

has anyone popped the driver out of the back cover? I was thinking of mounting the back cover to a project box for a monocular.
Thanks for accidentally testing if the device has reverse voltage protection. I guess from you post that is has

superslack
Posts: 78
Joined: 08 Feb 2016, 23:58
Location: Virginia

Re: New display

Post by superslack » 12 Dec 2017, 13:58

Yes, I meant to state that more clearly. I'm not sure you could leave it indefinitely as started heating up in short order. But, you should be ok with a clumsy mistake for a few minutes.

I don't know if makes a difference, but the input voltage I am using is 3.3 volts.

lightmesser
Posts: 540
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: New display

Post by lightmesser » 12 Dec 2017, 22:56

Wait...

It is not clumsy mistake either... If I got you right you connected red to plus and black to minus? In normal world red is plus and black is minus...

If so than it is their clumsy mistake.

I can't say this is reverse engineering either... It is really unique product but they should now what red/black wire is for :(

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CustomRifleScopesUK
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Re: New display

Post by CustomRifleScopesUK » 22 Dec 2017, 18:49

OK guys,

After much chatting to the manufacturer, its a no no, to change the lens to make the screen appear bigger :thumbdown:

They say its too much effort to change the lens size unless we buy 10000 units.. :shock: ......well i don't think we do more that 1000 projects between us a year total, let alone a near eye project, i may have purchased 500 but 10,000 is a little too many to shift. The trouble with the Chinese is they come up with a great copies of something, but when it comes to designing a new idea, they seem to start great then mess up a few specs along the way :lolno:

So very sorry guys, its this as it is with a good high res small screen or a lower res big vf-2c screen ( or find an easy mod for the screen )

CRS

sikapup
Posts: 273
Joined: 17 Jun 2014, 09:26
Location: chichester

Re: New display

Post by sikapup » 22 Dec 2017, 19:07

cheers crs got the parcel and presie, many thanks and merry xmas :thumbup:
paul

lightmesser
Posts: 540
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: New display

Post by lightmesser » 22 Dec 2017, 19:08

CRS,
Could you get redesigned VF 2C with smaller pcb and smaller housing in new display style for example? And of course to resolve some child disease like red/black wire confusion + adding constant on mode(so no soldering required) and I guess you could ask them to swap to ocular lenses with longer eye relief?
If they accept new design(and it is really time for downsizing of it)for lets say 500 moq it may be good deal for you and us of course. Price can remain same if you ask me.

Vf2C has very clear and crisp image . We don't need better than that but for some builds size does matters as well as ease of use.

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CustomRifleScopesUK
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Re: New display

Post by CustomRifleScopesUK » 22 Dec 2017, 19:41

lightmesser wrote:CRS,
Could you get redesigned VF 2C with smaller pcb and smaller housing in new display style for example? And of course to resolve some child disease like red/black wire confusion + adding constant on mode(so no soldering required) and I guess you could ask them to swap to ocular lenses with longer eye relief?
If they accept new design(and it is really time for downsizing of it)for lets say 500 moq it may be good deal for you and us of course. Price can remain same if you ask me.

Vf2C has very clear and crisp image . We don't need better than that but for some builds size does matters as well as ease of use.

You are quite right and i have had many chats with them about the down sides to the VF-2c........but the problem is they don't want to listen, not sure if its pride or what, they have been selling them for years and cater for many customers ( so momentary switches are good for some ).....i suppose the y think "if it ain't broke, don't try to fix it" mentality about the unit as its no extra effort to keep the same !

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