px625 / mr-9 battery adapter
thingiverse
It's a vintage camera adapter that uses mercury batteries with a voltage of 1.35 volts. You'll need to make it with a 1n4148 diode and an SR44 battery, which has a voltage of 1.55 volts. Be careful when inserting the diode into place as shown in the picture - you should squeeze it tightly in there. This adapter is used for converting a higher voltage like 1.55v to a lower one like 1.35v. It works by using an SR44 battery with a switching diode, which is a type of semiconductor device.
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