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OpenFire - Open source firing system


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#31 pyromaniac303

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Posted 26 February 2014 - 08:36 PM

I see your point Trevor, they're not the most robust connectors in the world however they're cheap and readily available anywhere, so if you forget your cables at a display site just make a dash to your local Maplin/Currys etc.

 

For that reason however I am leaving considerable blank area (i.e. no copper) for those that wish to redrill and mount their favourite connectors. The 3.5mm connectors I'm using are the panel mount type, but mounted on the board its self and wired (2 per box, both in and out linked internally). It will probably make more sense with pictures when I get the V2 prototype boards in. I am holding off ordering boards until I get all parts including boxes to confirm dimensions - datasheets rarely 100% match real life dimensions!

 

1000x 4 way speaker connectors have arrived, and I shall be drawing up designspark footprints for them over the weekend after measuring a good handful of them.


You can never have a long enough fuse...

#32 whoof

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Posted 09 July 2014 - 10:50 PM

How is this going ?
Been quiet for a while.

#33 pyromaniac303

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Posted 11 July 2014 - 04:28 PM

Its still on the go, I had to wait for my 100 cases to arrive from China via sea-freight before I did the next PCB layout, as I wasn't going to draw up the board outline without measuring a sample of them. They came in a couple of weeks ago, got near enough all the parts required now excluding a couple of passive parts which I can pick up on next day delivery from Farnell, and have been playing around with a few ideas in code to try and make things run smoother.

 

I will probably order just 5 of the next iteration of boards as I'm sure there will be some improvements to make, so it still has a way to go before I can sell them.

 

Also been testing out manufacturing techniques, I etched some solder paste stencils from copper sheet the other day and used them to reflow solder a PCB so it should greatly simplify populating the board.


Edited by pyromaniac303, 11 July 2014 - 04:29 PM.

You can never have a long enough fuse...

#34 whoof

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Posted 12 July 2014 - 10:53 PM

 
Also been testing out manufacturing techniques, I etched some solder paste stencils from copper sheet the other day and used them to reflow solder a PCB so it should greatly simplify populating the board.


Interesting, i have tried this with 3 thou copper and 2 thou ally (using peroxide etch).

Both cases i found too much past applied resulting in bridging.

Any tips you would like to share ?

#35 pyromaniac303

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Posted 13 July 2014 - 08:57 PM

Interesting, i have tried this with 3 thou copper and 2 thou ally (using peroxide etch).

Both cases i found too much past applied resulting in bridging.

Any tips you would like to share ?

What package sizes were you using? Also what are you using to block the etchant from the reverse side of the stencil? For mine I used enamel paint on the reverse side, then toner transfer on the front face, and touched up any odd bits with permanent marker under a halogen lamp so I could see any reflective exposed copper.

 

Sometimes helps to reduce the aperture size by a percentage if you have bridging problems, but I think if you are using anything smaller than TSSOP/MSOP or the really fine QFPs you're going to always end up with a couple of bridges unless you go for a laser cut stencil with clean walls, as the etching process makes them slightly rounded. I still had a couple of bridges but nothing that couldn't be cleared up with braid, it cut build time by 1/4 compared to hand-build, and also made it possible to use some QFNs with underside paddles.

 

I did some rapid fire tests last night on an old version (hardware 1) slave and was happy with the results: http://youtu.be/PUNd...eTuHX2Sui6Y5J_w


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#36 whoof

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Posted 14 July 2014 - 05:24 PM

What package sizes were you using? Also what are you using to block the etchant from the reverse side of the stencil? For mine I used enamel paint on the reverse side, then toner transfer on the front face, and touched up any odd bits with permanent marker under a halogen lamp so I could see any reflective exposed copper.
 
Sometimes helps to reduce the aperture size by a percentage if you have bridging problems, but I think if you are using anything smaller than TSSOP/MSOP or the really fine QFPs you're going to always end up with a couple of bridges unless you go for a laser cut stencil with clean walls, as the etching process makes them slightly rounded. I still had a couple of bridges but nothing that couldn't be cleared up with braid, it cut build time by 1/4 compared to hand-build, and also made it possible to use some QFNs with underside paddles.
 
I did some rapid fire tests last night on an old version (hardware 1) slave and was happy with the results: http://youtu.be/PUNd...eTuHX2Sui6Y5J_w


Qfps are the problem mainly , im etching from both sides to reduce under etch.
Sometimes the bit between pads goes though.

Laser stensils are just to dear.

#37 pyromaniac303

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Posted 15 July 2014 - 11:30 AM

Qfps are the problem mainly , im etching from both sides to reduce under etch.
Sometimes the bit between pads goes though.

Laser stensils are just to dear.

 

What method are you using to align both sides of the artwork? If the pads are going through it may be a registration problem.

 

I have seen some reasonably priced kapton stencils for $25US here: http://ohararp.com/p...stencil-8-5x11/ they may do the trick for short runs, I was considering it myself but can't seem to find whether they ship to the UK.


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#38 whoof

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Posted 15 July 2014 - 03:40 PM

I use a punch and registration pins.

I should have acess to a laser from next week or so, kapton sheet is very difficult to find at reasonable cost though , i am told i cuts crisper than the mylar stuff.

#39 Crazy Cat

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Posted 07 October 2014 - 06:19 AM

delete please!

Edited by Crazy Cat, 23 October 2014 - 01:48 AM.

 

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. ― Albert Einstein ― Insanity is doing the same thing, over and over again, but expecting different results.

 

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#40 digger

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Posted 08 October 2014 - 11:02 AM

bit difficult using an old desktop PC in the middle of field.


Phew that was close.

#41 Crazy Cat

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Posted 10 October 2014 - 02:14 AM

delete please!

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Edited by Crazy Cat, 23 October 2014 - 01:48 AM.

 

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. ― Albert Einstein ― Insanity is doing the same thing, over and over again, but expecting different results.

 

Explosives-Danger-Sign-S-1812.gif


#42 digger

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Posted 10 October 2014 - 07:42 PM

Crackers

 

If you are taking this route why not just buy a usb output board from vellemam and then use your tablet, to save using outdated obsolete heavyweight technology. Far easier and you can fire a show from your favourite spread sheet.


Phew that was close.

#43 Crazy Cat

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Posted 11 October 2014 - 01:32 AM

delete please!

Edited by Crazy Cat, 23 October 2014 - 01:49 AM.

 

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. ― Albert Einstein ― Insanity is doing the same thing, over and over again, but expecting different results.

 

Explosives-Danger-Sign-S-1812.gif


#44 Arthur Brown

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Posted 11 October 2014 - 07:47 AM

My lappy is about five years old (still on XPpro) it has no parallel port. going out into the field to use a lappy old enough to have a parallel port is a retrograde step. 


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#45 Crazy Cat

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Posted 11 October 2014 - 11:48 PM

delete please!

Edited by Crazy Cat, 23 October 2014 - 01:49 AM.

 

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe. ― Albert Einstein ― Insanity is doing the same thing, over and over again, but expecting different results.

 

Explosives-Danger-Sign-S-1812.gif





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