added link to original psu

input/blog/2021/2021_06_25_rd_psu_mod.md

 parent: projects
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-About two years ago, in 2019, my bench top power supply decided to give up.
+About two years ago, in 2019, my [Basetech BT-305](https://www.conrad.com/p/basetech-bt-305-bench-psu-adjustable-voltage-0-30-v-dc-0-5-a-150-w-no-of-outputs-1-x-513812) bench top power supply decided to give up.
 It no longer showed the correct voltage, only displaying zero, and the regulation did not seem to work anymore either.
 I noticed that when a battery I tried to charge started smoking... 😰