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Go Back   IceInSpace > Equipment > ATM and DIY Projects

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  #21  
Old 25-01-2014, 09:54 AM
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rcheshire (Rowland)
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Looks great Chris. I would go for the first option.
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  #22  
Old 25-01-2014, 03:29 PM
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h0ughy (David)
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gee your a clever bloke, this would be right up there as one of the most practical implementations for the benefit of astronomy ever.
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  #23  
Old 26-01-2014, 12:03 AM
Garbz (Chris)
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Well... Done.

Design complete. Everything is working. I ended up building a TINY variant of this circuit which fitted on the back of a pushbutton and then replaced the brightness potentiometer in the red-dot-finder with the button. It works brilliantly and with a bit of black epoxy it may even look original. Push button, red dot comes on for 60 seconds. What more could you ask for?


A kit maybe? Yes a kit!


If I can get enough interest in a common kit for these I'll offer them up. So how about it guys. Who wants one?

Right now I have two variants of the design.

Tiny Pushbutton Version:
This is designed to insert into the red-dot-finder. It does not include a battery. Install would involve splicing this between the battery and the red-dot. Simply cut both the battery leads, connect the battery + to the pushbutton, connect the laser + to the pushbutton also, connect the battery - to GND, and connect the laser - to the MOSFET Drain. Then figure out some way of gluing it in. Benefits of doing it this way is you can make it all in one inside the red-dot-finder. Downsides is you'll need to disassemble it.

Larger Self Contained Version:
This design is self contained, designed to be mounted externally to the red-dot-finder and has only 2 connections to be made which can be made directly to the red-dot-finder's battery terminals. It's bigger, it's about $3 more expensive to produce, but you can use it without any modifications to the red dot finder other than figuring some way of connecting some wire to it's battery terminals. This version also comes with two different population methods. If there's interest in this I'll give people the choice of a blank PCB which they can populate with either through-hole or SMT devices. The board layout will happily cover either, except for the mosfet which will stay as a SOT23 part, however these are really easy to solder even for SMT (the leads are very far apart so good luck trying to short it out or doing something silly like that). All parts can be sourced from RS Components, but most are also available from Jaycar for the through-hole variant.


Anyway let me know if you want one below and which version you want. If there's overwhelming support for one version I'll forget the other existed. I'll see about getting some circuit boards made up.

As for a case, you're on your own.
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  #24  
Old 27-01-2014, 08:18 PM
Garbz (Chris)
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Final Version

Ok we have a final version now.

I've rerouted the circuit board. It looks like a dogs breakfast but it has a purpose. One PCB does all the jobs now. I can either populate it with through-hole parts, surface mount parts, the resistor is more easily accessible now so the timing is easier to customise. Or I can populate all the parts on the back and then cut along the line to make everything much smaller. No more buying multiple circuit boards. If you want a small version without battery then simply cut along the marked lines.

The pushbutton is now in the very middle.

Large version is on a 31x26mm circuit board and has 4x 3.5mm mounting holes.
Small version is 17x9mm, no mounting holes.

I still need to confirm the bill of materials but I estimate that this will come to around $10 + shipping if anyone wants one. I'm happy to assemble them it only takes a moment to put it together.

No case though, you'll need to figure that out yourself.


Who wants one and which one do you want?
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  #25  
Old 28-01-2014, 03:46 PM
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The small version for me, please, Chris.
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  #26  
Old 28-01-2014, 08:10 PM
Garbz (Chris)
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No problems. Just realised I forgot to show a picture of the final thing.
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  #27  
Old 28-01-2014, 09:07 PM
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A small version, populated please.
When it's ready to go!
Cheers
Graeme
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  #28  
Old 01-02-2014, 02:13 PM
Garbz (Chris)
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Update: Boards are on order. Panellizing due tomorrow, should finish production within 2 weeks and then ship to Australia.

Sorry guys but it'll be March before anyone who wants one can get one.

I've ordered 18 small boards, and 6 large boards. There should be plenty to go around.
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  #29  
Old 09-03-2014, 06:12 PM
Garbz (Chris)
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Ok guys it's now available: http://www.iceinspace.com.au/forum/s...36#post1064236

I'll PM everyone who has expressed interest previously tonight.
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