PX1 battery adapter

thingiverse

*Version 3 changes (5/11/2018): - Added a notch at the base, the battery SR44 fit so tight that it's hard to get it out. A notch was added so replace SR44 battery is easier now. (Tested, works great). - Added a bar on the top so the wire from the diode could be hangover there, this way you don't need to solder anymore. (Tested, works great on my Canonet QL17). *Print setting: Fast (0.2mm), Support = Yes, Brim = Optional. A battery adapter to fit SR44 battery to PX1 battery (mercury). The PX1 battery is 15.6mm height, 15.6mm diameter, with voltage at 1.35v. It was used in camera as the source for lightmeter because of its steady discharge curve. It was discontinued because one of its ingredient is mercury. The silver oxide battery SR44 also has very nice discharge curve but its voltage is quite higher at 1.55v, and the size of SR44 is 11.6mm diameter, 5.4mm height. This adapter combine with a diode to fit the size of SR44 to camera using PX1. The voltage is dropped by a Schottky diode placed inside the adapter. Put one end of the wire in the diode through the hole between 2 cavities of the adapter. Twisting this end of the wire so it fits in the lower cavity of adapter, it will connect with negative end of SR44 battery. Because we forward-biased this diode so this end of the diode should have the mark. The other end of diode, hanging it over the bar of the upper cavity. Check the polarity of diode to ensure you connect it correct. For visual demonstration, check "Make" part. Video on how to install: https://www.youtube.com/watch?v=swTWZciAx24