[Tim] seen lately that a lot of initiatives recreating discrete logic have a tendency to take action with expertise round 70 years outdated like resistor-transistor logic (RTL) or diode-transistor logic (DTL). To construct one thing with these logic households these days requires an intense treasure hunt of vintage parts bordering on inconceivable and/or costly. Moderately than taking place this rabbit gap he determined to invent a considerably new logic system utilizing analog parts on this entry in our Element Abuse Problem.
The element in query right here is an analog multiplexer, which is generally used to pick one among two (or a number of) sign traces and go them by means of to an output. Not like digital multiplexers which solely go 1s and 0s, analog multiplexers can go analog alerts because the transistors aren’t pushed to saturation. He has provide you with a complete system of logic gates utilizing these parts, with trickier units like latches ultimately carried out with assist from a capacitor.
The primary try at utilizing this logic system had a small mistake in it which prompted these latches to behave as oscillators as a substitute, as a consequence of a polarity mistake. However a second try with simplified design and lowered element rely ended up working, proving out [Tim]’s idea. Not solely that however his second prototype is performing at a formidable 15 MHz, with a chance of a fair greater clock velocity in future designs. Not dangerous!
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