STABLE625 PX625 MR9 mercury battery adapter replacement 1.35V voltage regulator

Description

STABLE625 - 1.35V voltage regulator for vintage cameras and light meters.
Permanent fix for obsolete mercury batteries.
Once soldered inside the camera or light meter, it will allow you to use any battery between 1.5V and 5V.
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 1.35V output, via linear voltage regulator
Suitable input: 1.5V - 5V; overcurrent protection
Size approx. 6.5x6.5mm, less than 2mm thick
3 soldering pads: output, input and common ground
<20uA quiescent current
Works in extreme temperatures: -40C to 80C
Personally tested and used in Yashica Mat 124G with SR44 battery (+ plastic adapter ring). Input 1.6V, output 1.36V. Wired behind the switch, so activated only when the waist level finder is up. The meter is spot on with Sekonic L-308S.
Tested also in a vintage CdS light meter with activation button. Results as above.
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.
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.