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Signal Injector. Highlight Pen.
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30th Mar 2019, 10:17 am
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jonnybear
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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
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