But in a old device like a Beeb, the majority of the complex chips, and all the custom chips will need modelling. Of course in some software packages, a range of devices will have already been defined for you. Which means you again need to know a lot about the actual logic chips you are trying to simulate. Again, simulation software packages will likely contain generic gates (NOT, NAND, NOR) but you still have to define input threshold levels, switching time, output characteristics etc. Logic circuits using ordinary logic gates should be fine though? Alas, no. Or where you already know how the circuit is supposed to work, so can try different types. The problem gets worse with transistors, as there are so many types.Ī lot of the time you can substitute alternative transistors where the characteristics are available. In a logic circuit where there are large margins in the voltage levels, the difference may not be a problem, but the same cannot be said for analogue circuits for example. Just this small difference can completely change the operation of the circuit. And if a generic diode is used in the simulation, its characteristics may be sufficiently different to those of a specific diode used in the real world circuit you are trying to simulate. However in real world circuits, various types of diode are used. Any simulation software package will include at least a generic silicon diode. Take something that may be considered to be simple, like a diode. Hence why I only simulate sub-sections, as I would get bored trying to do a large section, let alone a whole computer. With electronic circuit simulation ( SPICE), there is a great amount of detail required. Much like when I bought a router (woodwork type) and in the end I did a nice coat rack with it, a few month later.Įdit: I have since also used said router to smoothly embedded some t-nuts in a piece of wood. Just my usual, here is this tool, now what can I do with it approach. which is higher than my budget of maybe a tenner. Unfortunately that idea feel apart when I realised the simulators that seem to do that are 100s to 1000s of £'s. what should I see if I stick a probe here. I read circuit simulators are good, not been able to find one I like, then while thinking of something to do with one, if I find one I can actually use the interface on, wondered if you could simulate bits of beeb to make debugging hardware issues easier. Arduino simulator! Write Arduino code right in iCircuit to create advanced microcontroller-based designs.Edit: In other words I am doing this backwards, looking for a tool without a clear idea why, and then had the idea of doing somethign with Beeb internals as that is what I spent the past two weeks doing.Īre you referring to that stubborn Beeb with the fault with IC45, and wondering if a circuit simulation could have helped in any way? Or have I got the wrong end of the stick here?.Scope data can even be exported for offline analysis. You can even export your circuits and PNGs, PDFs, and SVG files so that they are easy to include in reports or web sites. The scope can simultaneously track many signals over time and features a variety of automatic modes that make it easy for you to grasp the behavior of your circuit. If you want to see how a value changes over time, then you can add values to the built-in oscilloscope. The app features a multimeter that you use to probe around the circuit to instantly read voltages and currents. The app has everything from simple resistors, to switches, to MOSFETS, to digital gates. There are over 30 elements you can use to build your circuits. Instead, you just play with the circuit as you normally would, with the power on! You do not stop to take a measurement or spend a lot of time configuring reports. It's just like working with the real circuit. But iCircuit is unlike other CAD programs because it is always simulating. You use it as you would any CAD program: you add elements, connect them together, and set their properties. It is the perfect companion to students, hobbyists, and engineers. Its advanced simulation engine can handle both analog and digital circuits, Arduino microcontrollers, and features realtime always-on analysis. ICircuit is the easiest way to design and experiment with circuits.
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