Red Dot Finder external battery

[Ryachu]

Another day, another flat button cell. Grrrr !

Dismantled everything in sight to get an idea of how it works.

 

Replaced the button cell with a short circuit made from a piece of brass and a washer.

 

2 x AA battery box available at any good tat bazaar.

 

 

Cut a slot for the external feed.

 

Disconnected the -V from the PCB and wired up the battery box in series.

 

 

 ... and wallah ! Oops, forgot about the rear mounting bolt, stern letter to R & D.

Should the batteies go flat I can just swap them for the TV remote when nobody is looking. Simples !

[GrumpiusMaximus]

I bought this RDF and was highly amused to receive the instructions for zeroing a rifle included in the box.  This is a really good idea...

[M40]

Great idea, I can see that being copied more than a few times 👌 I bought that finder recently, might just have a look at it when the battery runs out.

Edited January 18 by M40
Speling

[Jim L]

Very nice work!

The batteries in my same red dot finders seemingly last forever, so I don’t have that problem, but it would be nice if the top rotating brightness switch were easier to turn so that doing so doesn’t compromise the alignment of my scopes. Now that you’ve had one apart do you have any thoughts on how the rotating switch can be modified for easier rotation?

[Ryachu]

Hi Jim,  the silver plate holds the numbered ring into the housing and the dimples on the edge engage in notches on the ring. It does not look adjustable to me but maybe some sort of lubrication would help.

[Jim L]

33 minutes ago, Ryachu said:

Hi Jim,  the silver plate holds the numbered ring into the housing and the dimples on the edge engage in notches on the ring. It does not look adjustable to me but maybe some sort of lubrication would help.

Thank you very much, Ryachu; I’ll try lubricant.