Have few questions about the NIXIE watch...

[vfdclock]

I am trying to design a cheap NIXIE watch etc.,have checked a few exist design,and currently seems
http://www.cathodecorner.com/nwl/nwld-mod-top.jpg
looks not bad,and the circuit is easy for us to do.and I have few questions about the component if the guys who have already had the watch like this ,hope can answer my questions.
Acoording to the pic,the socket of the tube in the pic looks like a regular 2.0mm female pin socket,would please confirm it,because we have tried, it seems the legs can be installed tightly inside the regular 2.0mm squire pin socket.Any suggestions?
And seems with a USB socket on the side is not a good design,that hard to do the waterproof,if we design the outside power pins under the bottom of the PCB and connect with the pins under the watch case ,will be good?(may need extra special wire for cherging)
Or if have any more suggestions please sya it out.

Best reagrds.

[JohnK]

I think he described/discussed the waterproofing a while back - search the posts for it.

 

John k

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[Mich...@aol.com]

Wireless charging would make it waterproof.

 

Michail

[David Forbes]

I found solutions to those problems myself.

You can find those solutions yourself.

--
David Forbes, Tucson AZ

[gregebert]

There's no such thing as a 'cheap nixie watch'.  It's a lot of work to design one that has long battery-life and reliability, and you will spend many, many hours perfecting the design of the DC-DC converter, board layout, and debugging. Even after 2 years of design work & debug, I found that mine wasn't rugged enough (died after being carried in my backpack for 2 weeks) even though it functioned correctly and has excellent battery life.

Regarding waterproofing, I'd suggest a photosensor, rather than switches, to set the time/date. The intent on my watch was to use metal contacts on the sealed case to provide access to the battery for charging. If you go that route, you *MUST* put a diode and a fuse in the path to the battery; imagine what would happen if the charging contacts got shorted-out. Unfortunately, I rushed the final assembly on my watch-case, and one of the battery charging-contacts is loose, so I cant recharge it. Oh yeah, the case is glued shut so I have to cut apart the handmade plexiglass case that took many hours to build & polish. Grrrrr......

[Scott Davis]

Hello:

Another alternative to the photo sensor might be, if space permits, a reed relay.   That was how the LED Pulsar watches did it.  They had a little magnet the was stored "stuck" to a bit of the band metal.

On Fri, Mar 11, 2016 at 9:05 AM, gregebert <greg...@hotmail.com> wrote:

There's no such thing as a 'cheap nixie watch'.  It's a lot of work to design one that has long battery-life and reliability, and you will spend many, many hours perfecting the design of the DC-DC converter, board layout, and debugging. Even after 2 years of design work & debug, I found that mine wasn't rugged enough (died after being carried in my backpack for 2 weeks) even though it functioned correctly and has excellent battery life.

Regarding waterproofing, I'd suggest a photosensor, rather than switches, to set the time/date. The intent on my watch was to use metal contacts on the sealed case to provide access to the battery for charging. If you go that route, you *MUST* put a diode and a fuse in the path to the battery; imagine what would happen if the charging contacts got shorted-out. Unfortunately, I rushed the final assembly on my watch-case, and one of the battery charging-contacts is loose, so I cant recharge it. Oh yeah, the case is glued shut so I have to cut apart the handmade plexiglass case that took many hours to build & polish. Grrrrr......

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-----------------------------------

Scotty

swo...@gmail.com

www.linkedin.com/in/scottdavis11

Skype: swooser

[Dan Harboe Burer]

..or an SMT mounted hall/magnetic sensor. I have seen some quite small ones at work.

 

Dan

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[A_Nonamus]

On Friday, March 11, 2016 at 9:05:51 AM UTC-8, gregebert wrote:

Unfortunately, I rushed the final assembly on my watch-case, and one of the battery charging-contacts is loose, so I cant recharge it. Oh yeah, the case is glued shut so I have to cut apart the handmade plexiglass case that took many hours to build & polish. Grrrrr......

History repeats itself... Riehl Synchronar ring any bells?