Tiny url http://tinyurl.com/jdp3qqr
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They both agree.
Circuit Diagram
Can a Full 74139 chip be built?
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Using just NAND gates requires too many of them. See http://www.neuroproductions.be/logic-lab/index.php?id=63191 for the unfinished work in getting a full chip to work.
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Component
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Manufacturer Part No
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Order Code
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Price
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Min Qty
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Assemtech RI-90 Micro Changeover Reed Switch
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N95BT
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Maplin
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4.09
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1
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YA29G
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Maplin
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1.79
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1
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WELWYN - MFR3 2K2 FC - RESISTOR, 0.4W 1% 2K2
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MFR3 2K2 FC
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1565301
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.
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