Battery replacement module for Chinese vernier scales

When I created the external 1.5V PSU modules for use with my DRO350 it struck me at the time it might be possible to create the same PSU in a dummy battery to fit directly into the scale battery socket.

I used the same AMS1117 regulator chip and decoupling capacitors mounted on a small pcb inside a short piece of K&S thin wall brass tubing.  The pcb was milled on the Tormach 440 with hand written G Code and using a dental burr as the engraver.  Once the pcb was soldered into the end of the tube I turned back the tube to leave the pcb proud of the tube to match the normal battery profile and spring contact in the scale battery socket.

It was a bit tight to put together but it works !   I am debating a full write up so look back in the future.

 

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