Those LEDs in the matrix arrays are very efficient. You'll get "satisfactory" light output from only 2-3mA for ea LED. The 74LS138, if you sink current from it, it might be adequate enough.
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Those LEDs in the matrix arrays are very efficient. You'll get "satisfactory" light output from only 2-3mA for ea LED. The 74LS138, if you sink current from it, it might be adequate enough.
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