Posted 21 November 2012 - 10:07 AM
But, what this about is that I bought 5 muffin (computer) fans from an amateur radio swap & shop several years ago for a buck and had a few left over from one of my radio projects.
I used one of the 3 1/2 inch 12 VDC fans for this project.
I cut a thin piece of plywood and drilled holes near the edge of the the board for three small bungee cords.
The hooks fit over the locking screws.
Here is a shot of the two wire with female coaxial plugs at either end.
This is the coaxial jack mounted to the back of the plywood.
I drilled a small hole next to it to run the pair of power leads from the fan and used clear sealer.
This is the label of the White's Metal detector NiCad battery pack I modified.
After opening the cover of the NiCad pack.
Had to use a razor knife because they had glued it on.
Removed the no longer useable (corroded/white) NiCads and replaced with 2500 mAh NiMH Batteries.
I added the mini SPDT switch.
Then I tried looking for a battery charger, as I had to solder one end of the batteries in the case.
The only one(s) I could find were for separate batteries that could be inserted individually.
Therefore, I built my own.
I'm not going to take a picture of the inside. It's NOT pretty - But, It does work
The site where I obtained the circuit for the charger.
I chose R2 for 300mA charge current.
Tried it out several nights ago and it worked well with no noticable vibrations while looking thru the eyepiece.
Posted 21 November 2012 - 10:20 AM
***Make sure you use a heat-sink on it***
Most of the other parts I had in my junk box, including the black plastic box
Posted 24 November 2012 - 07:32 AM
I the ran power over a coiled phone cable for the bungee effect on the cable.
here is mine
Your's is a much neater setup than mine, Jim.
I may have to replace my power cable with a coiled cable like yours, Thanks.
Posted 24 November 2012 - 01:46 PM
The close baffle helps to abolish tube currents. Made a big difference.
Posted 24 November 2012 - 05:13 PM
Posted 24 November 2012 - 05:18 PM
Seriously, that's a cool looking rig. What are the extras visible in your last photo?
Posted 24 November 2012 - 06:31 PM
Posted 24 November 2012 - 06:42 PM
Extras? A shelf for my eyepiece case and a stand for my netbook (which is removeable - I haven't used in quite some time)