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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
well the matrix looks right,
the PNPs look right,
the 138 is a 3 to 8 way decoder
i havent checked the connections,
or the logic to the bases,
which wants to be high i think to shut the transistors,
which seem to be wired as emitter followers,
i have a feeling that the 138 gives a logic signal high,
but i will have to check ...
the straight output from the port
is only capable of a signal output,
but i would think it could operate an LED alright.
If the circuit here is ok,
then i would suspect the program feeding the port ...
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