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Old 22 May 2014, 14:46   #415
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Join Date: Dec 2012
Location: Sweden
Posts: 125
Ah, I get it. Did not think about that.

Saftey foremost, the CIA might tolerate getting +5V on that pin, since that is within TTL levels, but it will not tolerate +12V, and transistors like BC547 sometimes break down, sending the collector voltage through the base and emitter.
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