That reminded me of scraping off the black paint from OC transistors and making phototransistors.
Cheers
Raj
At 11-06-2017, you wrote:
>BC548 diagram? >Sometimes its the simple things that trip us up, Used to spend hours with OC71 & OC81 transistors, but that was years ago.... Cough cough..... 40+ years ago, mind forgets things.
>
>Phil - G7BZD