I am a bit confused as well about the tristate condition. What do I get? Would that result in the same circuit, functionally? In other words, what is the essential function of the optoisolator? Looking inside the optoisolator as a four-terminal black box, suppose I replace each optoiso with a BJT (collector, emitter on output sides, and base on the input side connecting to the red/green LEDs) and in place of the IR led, placing either a resistor or another LED. So I have a question as I try to understand this circuit. When I first saw this I said, “but can it make a latch?” And then I watched the video, and voila there it was. Posted in Misc Hacks, Parts Tagged led, logic, logic gate, opto-isolator, optoisolator, optotransistor Post navigation It’s not a ternary computer yet ( although we have seen those), but it is very cool and most probably not stupid. There are about 20 universal logic gates if you can deal with a two. This is huge there are only two universal gates when you’re only dealing with 1s and 0s. In addition to a basic “1” and “0” logic state, these gates can also be configured for a tri-state input and output. It is theoretically possible to build something that could be called a computer with this, but that would do the unique properties of this circuit a disservice. He already has an inverter and a few dozen more optoisolators coming from China. With a few more buttons and LEDs, created something that is either an AND, NAND, OR NOR, depending on your point of view. Connecting the input of the circuit to +5 made the LED connected to ground light up. Connecting the ‘input’ of the circuit to ground made the LED connected to +5V light up. He could then connect the inputs of the isolators to +5V and Gnd because of the voltage drop of four LEDs.Ī few more wheels turned in ’s head, and he decided to connect a switch between the two optoisolators. This idea whirled around his mind for a few months until he got the idea of connecting even more LEDs to the inputs of the optoisolators. Tying the other ends of the phototransistor to +5V and Gnd meant he could switch between VCC and VDD, with every other part of the circuit isolated. was playing around with some optoisolators one day to create a weird push-pull circuit the emitter of one phototransistor was connected to the collector of another. There’s no electrical connection between the two devices, which is exactly what you need in something that’s called an isolator. Inside each optoisolator is a LED and a phototransistor. He has proposed two reasons why this hasn’t been done before: either is exceedingly clever, or optoisolator logic is a very stupid idea. You’ve seen CMOS logic, you’ve seen diode-resistor logic, you’ve seen logic based on relays, and some of you who can actually read have heard about rod logic.
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