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jonnybear · 30th Mar 2019, 10:17 am

Had a little time to waste the other day and spied a High Light Pen in the bin.
Using a couple of BC548 transistors and a few other components on a matrix board driven by a CR2032, works a treat.
John

30th Mar 2019, 10:17 am	#1
jonnybear Octode Join Date: Nov 2010 Location: Cullompton, Devon, UK. Posts: 1,435	Signal Injector. Highlight Pen. Had a little time to waste the other day and spied a High Light Pen in the bin. Using a couple of BC548 transistors and a few other components on a matrix board driven by a CR2032, works a treat. John Attached Thumbnails