PNV 57E Nightvision Wiring?

Enquiries, article suggestions or blog related questions in general?
User avatar
net_split
Admin & Support
Posts: 286
Joined: 22 May 2015, 15:40
Location: Germoney
Contact:

Re: PNV 57E Nightvision Wiring?

Post by net_split » 26 Jan 2016, 14:52

Plug n' Play, I understand ;)

nomam
Posts: 1
Joined: 03 Feb 2016, 14:00

Re: PNV 57E Nightvision Wiring?

Post by nomam » 02 Mar 2016, 05:14

Hello Guys,
this is pretty much the only western documentation about modding the PNW-57e, so i thought i share my 5cents about the alternative power supply shown on the previous page.

First an for most: This is a High Voltage Application that can easily kill you! Near 20kV with mA strength is nothing that should be done without deep Knowledge about what your doing!

According to some Russian Documents the Alkali Photo Cathode is working at about 18kV DC and is behaving like a capacitor, the original circuit is charging it up and waiting til the voltage drops again, than it starts to pulse again. I measured about 1,35kHz with 14V AC on the primary side. I know nothing about the power consumption on the secondary side, it seems to be in the uA range? All in all a really nice solution to save energy and extend the lifetime of the tubes.

Back to the self-made solution: CCFL Circuits vary form 300V to 1kV - you should know what you have in front of you. The Cockcroft-Walton Multiplier should have as less stages as possible, 13 seems fine for a 700V CCFL. The Capacitors must withstand at least twice the input Voltage. If you use a 1kV CCFL, you need 2kV Capacitors! 500V is far to less! Same for the diodes. Having a Resistor behind the Multiplier is a bit BS, instead i would rather cut down the size of the Capacitors to bring the Current down to a less deadly amount. I will start with 5pf for my first test, the ccfl is much faster (30kHz) than the original transformer, so it should be able to keep up with charging even with smaller capacitors - if i survives i will report again, 1nf seems to be far to much.

There is a negative Voltage power supply shown, the original circuit is a positive one, i would prefer to keep ground on ground potential and the high potential at the inside :lol:

Isolate that shit! Solder the Coax Cable to the Multiplier! Insulate that shit again :D and expect arc ranges up to 2 cm if the isolation fails! I would embed it in resin too, including the cable. I could not find a suitable Cable with 20kV Voltage, but solid PTFE Coax Cable should do the job with about 40kV isolation per mm in theory.

Again: this post is all about sharing ideas and information, it is not meant to be an Instruction in any way!
I still prefer to use the original Transformer and Multiplier together with the Driver! This is much saver than dealing with Voltages no one can measure exactly and lots of unknown specs of the tubes.

If someone has better and more detailed Information, thank you for sharing it too ;) Maybe we can find something save to use.

Wheeler
Posts: 4
Joined: 14 Jan 2016, 16:32
Location: Germany, Unterfranken

Re: PNV 57E Nightvision Wiring?

Post by Wheeler » 11 Mar 2016, 23:09

Hi,
Thanks for your ideas.
What do you mean by " Having a Resistor behind the Multiplier is a bit BS"?

edit: @net_split i know that, i just had no idea what BS means?
Last edited by Wheeler on 12 Mar 2016, 14:49, edited 1 time in total.

User avatar
net_split
Admin & Support
Posts: 286
Joined: 22 May 2015, 15:40
Location: Germoney
Contact:

Re: PNV 57E Nightvision Wiring?

Post by net_split » 12 Mar 2016, 14:12

The current at that voltage is super dangerous. And in the schematic a resistor is used to limit the current.
Instead it is a much safer idea not to produce such a high current in the first place, by lowering the capacitor size.

Wheeler
Posts: 4
Joined: 14 Jan 2016, 16:32
Location: Germany, Unterfranken

Re: PNV 57E Nightvision Wiring?

Post by Wheeler » 14 Mar 2016, 15:58

Something completely different. On one of my PNVs the eyepiece rubber is missing.
Someone knows were i can get a new/ different one?
Or if the rubbers from another NVG are working?

Slavi
Posts: 1
Joined: 24 Aug 2016, 17:24
Location: Berlin / Brandenburg

Re: PNV 57E Nightvision Wiring?

Post by Slavi » 24 Aug 2016, 17:28

Hallo, ich habe zwar keine frage zur verdrahtung, wollte aber kein neues Topic öffnen.

Wie habt ihr den rhino Montagearm am Nachtsichtgerät befestigt?
Der standart Arm sieht ja doch etwas unstabil aus ^^

User avatar
net_split
Admin & Support
Posts: 286
Joined: 22 May 2015, 15:40
Location: Germoney
Contact:

Re: PNV 57E Nightvision Wiring?

Post by net_split » 06 Oct 2016, 01:23

Slavi wrote:Hallo, ich habe zwar keine frage zur verdrahtung, wollte aber kein neues Topic öffnen.

Wie habt ihr den rhino Montagearm am Nachtsichtgerät befestigt?
Der standart Arm sieht ja doch etwas unstabil aus ^^
Schau mal hier:
viewtopic.php?f=10&t=42

Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests