My daughter got a toy train which uses AA sized battery cells to operate. It has space to put two AA cells in parallel, so it requires just 1.5 V to work. To avoid buying AA cells, I tried to make it rechargeable with a 18650 lithium-ion cell with protection board having USB port. But… Continue reading 3.7 to 1.5 V Buck Converter with MC34063AP
I see pdftk get first in list as most recommended way when searching for editing PDF metadata in Ubuntu. But pdftk is no longer present in Ubuntu 18.04 repositories. Found a different tool named PDFMtEd, which is actually a GUI front-end for ExifTool.