Mini multi red build

[Doc]

I started work on my mini multi red project. Tec cooled, Flexdrive, 4 x LOC with glass optics.

Gonna need some help with the TEC drive circuit on this one guys.

I'm on with fabbing the cube mount and I've just ordered a 2.5x minature telescope with AR coated optics from fleebay.

[MechEng3]

Are you planning to use one driver and resistors/diodes in series? Please tell me of this telescope with AR coated optics...Is the optic cavity less than 22mm long? Please elaborate...

[cat]

I know the red that DJMatt put in his. What exactly is a mini multi red? I know what multi means and I could see that there were two. Pardon me for asking........I just think it awesome what you guys build. Cat

[QUOTE=Doc;99387]I started work on my mini multi red project. Tec cooled, Flexdrive, 4 x LOC with glass optics.

Gonna need some help with the TEC drive circuit on this one guys.

I'm on with fabbing the cube mount and I've just ordered a 2.5x minature telescope with AR coated optics from fleebay.

[Doc]

Are you planning to use one driver and resistors/diodes in series? Please tell me of this telescope with AR coated optics...Is the optic cavity less than 22mm long? Please elaborate...

I am planning on using one driver with a cushion resistor between each diode. With regards to the telescope; I do not know the cavity size, the details are very sketchy (only size quoted is external measurements which are 20mm diameter x 35mm long, however it was very cheap so no biggy if it doesn't work out.

[Doc]

[QUOTE=cat;99395]I know the red that DJMatt put in his. What exactly is a mini multi red? I know what multi means and I could see that there were two. Pardon me for asking........I just think it awesome what you guys build. Cat

I started work on my mini multi red project. Tec cooled, Flexdrive, 4 x LOC with glass optics.

Gonna need some help with the TEC drive circuit on this one guys.

I'm on with fabbing the cube mount and I've just ordered a 2.5x minature telescope with AR coated optics from fleebay.

Hi Cat, there are actually 4 diodes (will be tonight). There is a diode in each end of the heatsinks, which by means of the mirror arrangement and a PBS cube; should give me a double stacked beam (2 number overlapped beams).

Ian

[cat]

It sounds awesome. I'm sure you will have pictures, right? When Matthew isn't home, I can't ask him for a translation. Won't you all be surprised the day I can actually build something of my own? Cat


Hi Cat, there are actually 4 diodes (will be tonight). There is a diode in each end of the heatsinks, which by means of the mirror arrangement and a PBS cube; should give me a double stacked beam (2 number overlapped beams).

Ian[/QUOTE]

[mccarrot]

I think it's better to skip the TEC as this is not really needed, and use a seperate driver for each diode. Dioded will fail eventualy if you use 1 driver for 4 diodes and one fails you could get a higher current and kill the other diodes.

But it look nice, and i'm looking foreward to see the finalised setuo

[Things]

Yeah I don't really think a TEC is necessary either. As long as you dont overpower the diodes, they actually run pretty cool, and are not susceptible to temperature changes (to a point). A fan should be fine with those heatsinks.

[Doc]

I know these things run cool with adequate sinking (i had a pair in one of my projectors), my plan was to try and sneak the wavelength down a two or three nm + they'll serve as my electrical insulator.

I had it lit up the other evening and got it roughly aligned, but I got side tracked; de virusing and rescuing a coleague's notebook

I'll try and get some pics up tonight or tomorrow.

[mccarrot]

Hmm I don't think it will payback the effort.

If you cool them from 25 degrees celcius down to 15 degrees you are lucky if you go from 660nm to 655nm and you will win a tyny bit in brightness.

If you just overdrive them a little bit lets say from 200mW to 225mW you will have 100mW more power and this will be more usable I think.