STABLE625 2X PX625 MR9 mercury battery adapter replacement - 2.7V V. regulator

Description

STABLE625 - 2.7V voltage regulator for vintage cameras and light meters.
Permanent fix for obsolete mercury batteries - cameras/spot meters that require 2x MR9 or 2x PX625.
Once soldered inside the camera or light meter, it will allow you to use any battery between 3V and 7V, or multiples of typical coin batteries.
Advantages
Output voltage does
not
depend on the type of battery, ie.
works with alkaline
or any other kind. Silver oxide recommended.
Output voltage does
not
depend on temperature and amp draw like in MR9
CRIS
adapter or any Schottky diode adapter.
Meant to be installed inside the camera or light meter as an upgrade and permanent solution
Can last longer than zinc-air batteries, if your camera does not have a on/off switch, just take your battery out for storage to avoid slow drain. Zinc-air batteries will last only 2-3 months regardless of usage and can be difficult to find in rural areas. LR44 or SR44 are the most common to purchase.
Improved replacement for MR9/PX625 battery adapters with Schottky diode, Schottky diode conversions, Wein cells, alkaline batteries. To install the battery in the battery compartment, you may still need to improvise or use an inert PX625 shape adapter for your battery of choice. For example, you can use a faucet rubber o-ring.
Features
Stable 2.7V output, via linear voltage regulator
Suitable input: 3V - 7V; overcurrent protection
Size approx. 6.5x6.5mm, less than 2mm thick
3 soldering pads: output, input and common ground
<40uA quiescent current
Works in extreme temperatures: -40C to 80C
Personally tested and used in Gossen Lunapro with 2x LR44 battery (+ plastic adapter). Wired directly to detached battery terminal wire. May cause battery drain, so I remove batteries from the light meter when not used (good practice regardless).
There is enough space to add a miniature on/off cut off switch on the side, I may do that soon.
This product is intended to be installed by a trained camera repair technician. You can bring it along with your camera to CLA, or if you are a camera repairman, offer it as a service.
I offer a 1.35V version on my other auction.
Warning: shorting the contact pads or overheating with soldering iron can cause product break down.
Ruler in the pictures used as a scale, not included in the auction.
Picture portrays the 1.35V, to be updated