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Low duty cyle (2.5%) oscillaor based on a 555 chip designed to act as a minimal power draw or 'dummy load' in order to defeat the auto-off circuitry of a commercially available power bank so that it can be used to power other electronic projects. cwgstreet/Low-duty-cycle-555-oscillator. Ok, so I finally broke down and installed LTspice and of course the first thing I needed was the 555, but the model that comes with LTspice is really dorkeyI mean how do you lay out a proper schematic with that thing. So my question is Does anybody here have a proper model, something that.
- 555 Timer Circuits (133) Browse through a total of 133 555 timer circuits and projects including the timer’s datasheet. There are simple circuits for beginners and advanced engineers. 555 datasheet 555 duty cycle 555 metronome 555 reset function 555 time delay relay inverted 555 timer pulse generator.
- Nov 21, 2014 The NE555 model included with LTspice is an idealized behavior model that doesn't accurately model all of the real device's characteristics, such as output voltage. Attached is an old Fairchild uA555 transistor level model with pinouts modified for use with the attached LTspice.
- LM555 Timer 1 Features 3 Description The LM555 is a highly stable device for generating 1. Direct Replacement for SE555/NE555 accurate time delays or oscillation. Additional. Timing from Microseconds through Hours terminals are provided for triggering or resetting if. Operates in Both Astable and Monostable Modes desired.
LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits. Included in the download of LTspice are macromodels for a majority of Analog Devices switching regulators, amplifiers, as well as a library of devices for general circuit simulation.
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Our enhancements to SPICE have made simulating switching regulators extremely fast compared to normal SPICE simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. This video provides an overview of the advantages of using LTspice in an analog circuit design and how easy it is to get started.
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Update 2016-08-25: LTSpice XVII is out! It doesn’t look that different from IV but it’s definitely improved under the hood. There is a quirk though: it installs a set of component libraries in the usual place, but also in C:Users%username%DocumentsLTspiceXVIIlib … and it ONLY uses that second set! (As a test, I removed the examples and libs in the install dir and it worked just as well.) This may be a transient bug or part of the migration to a new directory model – either way, if the normal install doesn’t work for you, install the memristor library to the folders in C:Users%username%DocumentsLTspiceXVIIlib
Update 2016-02-08: The examples can be found on my GitHub repo (MartyMacGyver/memristor-modeling)
Update 2015-03-30: My goal was to create a simulation in LTspice using a memristor component… I did NOT write the SPICE model for the memristor component itself (it’s straight out of the paper by Biolek, Biolek, and Biolkova as noted in the Readme file). Due to the limitations of that model, this simulation only works in transient analysis mode. The parameters are “.tran 0 3s 0 3m uic” (uic used to be called skipbp).
Lately I’ve been getting back into the EE groove with some random electronics projects (such as an Arduino-based LED strip driver). I’ve also been dabbling with different circuit simulators like Micro-Cap (which I used back in college but which is VERY expensive for the regular version… still, it’s handy for quick little sims to learn new things, especially in the digital realm).
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Today I stumbled on LTspice from Linear Technology, which I found to be surprisingly intuitive (and given that it’s based on the venerable and powerful SPICE it’s that much more worth learning). It’s not as animation-friendly as Micro-Cap but it’s pretty easy to make custom components (and where else can you simulate the actual inner workings of a 555 timer or a 741 op-amp?) (And yes, the 741 is not something you’d reach for normally nowadays, but they are instructive nonetheless.)
Memristors have intrigued me since they made the news a few years back, when discoveries were made of practical memristive materials. You can read more about them on Wikipedia and so on, and though very subject is not without controversy I personally think they will prove to be a valuable technology going forward. I found them intriguing from both the EE and the MSE perspectives.
Side-note: if you find yourself wondering more about why a device does what it does (in my case, the humble MOSFET) than regurgitating Kirchoff’s Law and applying Thévenin’s theorem, you’re probably better off in Materials Science Engineering than Electrical Engineering. At least that’s what happened to me… that and a very grumpy EE prof who made it clear we’d all be obsolete, unemployed and grumpy like him soon anyway. And you can always fall back on CS when the semiconductor market tanks…
Given all that, today I decided to see if I could simulate a circuit with a memristor in it. Problem is, while some sims have memristors, LTspice does not, and apparently nobody out there has published a simple example that actually works (I found videos – who writes a text tutorial in a video? – and a broken webpage, but I never found a working sim). So, I made one… and after a few false starts I got it to work. Not bad for an evening at home!
To try out my demo LTspice-based memristor simulation, please visit my GitHub repo (MartyMacGyver/memristor-modeling) and follow the instructions there for how to install and use it.
And to reiterate, this is a demo based on the SPICE model of a memristor as described in one paper… this is for educational purposes only and no, I can’t help you with your homework. ?
Astable Multivibrator Ltspice
To test all this, install the latest LTspice, install the files per the Readme, load up memristor_sim.asc, and run the simulation. This currently works with LTspice IV and the latest LTspice XVII.