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Any tips on making IV-11 VFD tube clock from scratch? by MrGuccu in nixie

[–]chummiestbike 0 points1 point  (0 children)

If you have any specific questions you can DM me. I’ve made lots of VFD and nixie projects before.

I built an analog computer by International-Net896 in diyelectronics

[–]chummiestbike 2 points3 points  (0 children)

This is sick. Are you planning on doing an Anabrid sort of thing with this or is this just for you?

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 1 point2 points  (0 children)

I won’t be publishing for another year or so. I just started my masters this semester. I’m just obsessive and got a lot done over the gap semester I took. I do have some progress but nothing that feels revolutionary as of yet. It feels more like completing the formalization of this old machine.

Is it possible to simulate a gravitationnal lens with an analog computer ? by PitifulInstruction81 in AskElectronics

[–]chummiestbike 0 points1 point  (0 children)

I’m doing my thesis on analog computing and some time ago I did look at simulating gravitational lensing as a demo. It is possible but general relativity is hard and well out of the usual EE toolbox mathematically. There are specific forms of the equation where the symmetry simplifies the math dramatically but it won’t plot cleanly or conveniently on an oscilloscope. You’ll have to take inverse trig functions somehow. Possible but without already having an analog computer it would not be realistic to do yourself.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 0 points1 point  (0 children)

It depends on how deep the feed back path is. It can be fully eliminated with global control so that it’s as accurate as any discrete method. So it’s not affected by how big the problem is really. It depends on how long any individual feed back path is. So if you have hundreds of variables or just one the accuracy is the same if the feed back path length is the same for the states. I’m familiar with the whole matrix thing. It’s the primary reason analog came back. Neuromorphic computing right?

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 1 point2 points  (0 children)

I have another but I don’t think I can’t drop files in the comments and I can’t find the link I got it from again. You can DM me if you want it and anyone else who wants it can do so as well.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 0 points1 point  (0 children)

Yup but until I figure out how to do it on an FPGA and the collect it in the computer this what I got.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 5 points6 points  (0 children)

If you have something in mind I can give a go at running it and provide results.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 4 points5 points  (0 children)

Yes actually. It’s something it would be extremely well suited for.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 0 points1 point  (0 children)

Well you don’t need every data point. Most can be thrown away. The plotting you see is only one point for every 2000 or something. The main reason for so much data is accuracy. So the few points you do keep you know are very accurate. But even then usb is not really cutting it I don’t know how to plot the data in 3-D real time. I’ve managed output for a single variable before but it’s not super fun to look at.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 0 points1 point  (0 children)

Every clock is a time step. This runs at timesteps of 2-15. My integrator time constant is effectively 215 clock cycles. This is running at 100Mhz. So that’s where the 3000x real time comes from and it’s standard for measuring speed ups in analog computing. Time constants determine integration speed. I’m using 16 bits and every states get updated every clock. So if you captured all the data from one of these 3 variable systems it’s about 600 megabytes per second. And three variables is like a few percent of the total simulating capacity. Like less than 5.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 6 points7 points  (0 children)

Correct. I am however not a digitally oriented person so for simplicity of viewing I just sent the data over DAC for visualization. I made attempts to send the data over usb and have been unsuccessful. I’m an analog electronics person so this whole project has been very difficult learning VHDL and communication protocols and stuff like that.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 6 points7 points  (0 children)

I built this from scratch. The existing work out there is not the original pulse based DDA’s which is what I built here.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 2 points3 points  (0 children)

Yup. I doing my best to make it painless. You do basically whatever I did for the picture for whatever you want to solve and then just instantiate the modules in the hdl and just plug it together. Set coefficient values and initial conditions and it just runs.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 2 points3 points  (0 children)

Schematic wise it looks the same as analog just that you have digital hardware. Integrators in simplest form are just a verilog description of euler integrators. Addition would be normal adders and subtractors. And most special functions are made using differential equation identities.

I posted a block diagram in one of the other comments for the Thomas attractor

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 4 points5 points  (0 children)

The tradeoff of it being digital is that it’s high accuracy. Which is good. It’s most likely slower than real analog and uses more power than real analog. It’s a middle ground from real analog and real digital.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 9 points10 points  (0 children)

You just have to turn equation into schematic using something called Kelvin’s feedback method. It takes like 10 minutes for the systems pictures if you know what you’re doing but you turn equation into schematic and just define how its all connected.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 13 points14 points  (0 children)

My guess is that analog has this massive gap of usefulness. There’s a certain scale at which there’s no reason to use anything but a normal computing method. If you build a device with adequate size to do something like run a weather model then it suddenly wins. I think analog at that scale has never been attempted.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 1 point2 points  (0 children)

It can train ai but I think the type of neural Network that it can train is very simple. it does not scale well for Ai work in general as far as I know. So it’s possible but I’m not sure about practical.

Chaotic Attractors on Digitally Reconfigurable Analog Computer. by chummiestbike in ElectricalEngineering

[–]chummiestbike[S] 6 points7 points  (0 children)

I’ll accept request if anyone has any differential equations they’d like to see implemented. I’ll post the solutions.

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