Any Ideas for Cheap Power Supply?

[russellhq]

I'd like to build a simple box to go with my mount that houses all the data and power connectors (I've seen quite mightly impressive examples on here already) so that I only need to connect 1 power lead and 1 USB lead. Since I image outside on the patio, I'd like to have the flexibility of only disconnecting 2 cables if I need to take the mount indoors in a hurry i.e. rain.

I'm pretty much there with the USB as all my cables go into 1 hub and I just have 1 cable going back to the laptop. But for power, things are a little different and are likely to change with some upgrades I'm considering.

Right now I power my mount from one of these http://www.maplin.co...er-supply-42702 connected to an extension lead.

My aim is to build a box that has enough power for the mount, DSLR camera, mirror fan and dew heaters for main scope and guiding scope. From reading various specs, i think I would need at least 7 or 8 amps @ 12V based on the following:

Mount: 2 amps @ 12V

Fan: 1 amp @ 12V

DSLR: 2 amp @ 12V

Dew heaters: ???

Any pointers on building/sourcing a cheap power supply would be greatly appreciated!

[Bizibilder]

I think it would have to be a DIY job if you want that sort of thing - as you say there are several threads in the DIY section and I'm sure if you ask some good folk will help you with the finer details of their designs.

[russellhq]

I think I might go for one of these: http://www.maplin.co...power-units-231 and run 12V up to the distribution box at the mount. I don't think there's anything cheaper!

I could then simply wire up some connectors for the different devices inside the box. I'll need some electronics if I want to get power to the camera as it's an awkward 7.4V.

[JAS]

How about somthing like this:

http://item.mobileweb.ebay.co.uk/viewitem?itemId=200875850605&index=4&nav=SEARCH&nid=05140472143

I used a 5v one in mine and it has worked very well for over a year now.

Jason.

Sent from my LT15i using Tapatalk 2

[russellhq]

How about somthing like this:

http://item.mobilewe...nid=05140472143

I used a 5v one in mine and it has worked very well for over a year now.

Jason.

Sent from my LT15i using Tapatalk 2

Do you know if they're switching or regulated power supplies?

[JAS]

Your 1100d will run off 8v no problem, so nice and easy to get a regulator, again I have done this in my hub.

Jason.

Sent from my LT15i using Tapatalk 2

[Tinker1947]

I think I might go for one of these: http://www.maplin.co...power-units-231 and run 12V up to the distribution box at the mount. I don't think there's anything cheaper!

I could then simply wire up some connectors for the different devices inside the box. I'll need some electronics if I want to get power to the camera as it's an awkward 7.4V.

Check out the duty cycle, the 3amp is really only a 2amp, same applies for there 5amp and 7amp these figures are for 50% cycle times.....

[JAS]

I think they are switching. A quick email to the seller would confirm.

This one http://item.mobileweb.ebay.co.uk/viewitem?itemId=181055950571&index=19&nav=SEARCH&nid=73506631985 looks like a lower powered version and says switching.

Jason.

Sent from my LT15i using Tapatalk 2

[russellhq]

Thanks JAS.

I've been reading your thread about the box you built and it's definitely given me some food for thought!

http://stargazerslou...0625-mount-hub/

Can I ask, how did you go about making the supply for the camera?

[Herbig]

I've got one of these http://www.tlc-direct.co.uk/Products/SK650659.html

15 amp regulated power supply, plenty of power to run everything - note prices are + VAT.

They also do a 5 amp one for £13.50 + VAT.

[JAS]

I used a cheap ebay battery as discussed herehttp://stargazerslounge.com/index.php?/topic/143006-1100d-external-power-help and then picked up an 8v regulator from Bitsbox and wired it as shown in the data sheet, I think it was just a couple of capacitors. This was then powered from the 12v supply.

Jason.

Sent from my LT15i using Tapatalk 2

[russellhq]

I used a cheap ebay battery as discussed herehttp://stargazerslou...rnal-power-help and then picked up an 8v regulator from Bitsbox and wired it as shown in the data sheet, I think it was just a couple of capacitors. This was then powered from the 12v supply.

Jason.

Sent from my LT15i using Tapatalk 2

Thanks Jason. I had a look on the Bitsbox website but couldn't find an 8V regulator, could you point me in the right direction?

[JAS]

You are correct, I couldn't find one eather?

This: http://www.ebay.co.u...=item43b3d64c86 will do it.

And the data sheet is here: http://html.alldatas.../4/L7808CV.html

Jason.