Computing with Analog
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- Опубликовано: 16 июл 2024
- Read the article: hackaday.com/2014/07/25/bil-he...
Bil Herd shows us how you can build a calculator using analog voltages. An analog computer!
This is exactly what it sounds like. You can take two input voltages of varying levels and add, subtract, or multiply the output depending on what circuit you use as the "calculator". It's not voodoo, and it's not overly-complicated. But things do get even more fun when Bil switches over from DC to AC for the experiments. 
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This sort of quiet continuity is so elegant. This stuff is an art form.
Bil, I've been waiting to see more of your little analog building blocks. Cool stuff and we def need more analog stuff like this. Thanks -Matt
Hi! This video is 7 years old but I just got a ton of inspiration from it for the project in the embedded electronic course I have in my college. Thanks a lot for this video!
Analog Devices, AD639 never to be seen again... Thanks for the video man.
Love the t-shirt. I saw Hawkwind many times in the 1980's....
Awesome video. I really love it. Th virtual ground ground thing is because the opamp equalizes the two inputs since the output is finite. What you described is kirchoff's current law....
Love the Hawkwind shirt. Great video!
this is all very interesting and very educational and i am enjoying every moment of it.
Extremely well done. Thank you greatly.
I came here for the analog computer but my mind is still blown by the Masters of The Universe T-Shirt. A "dodgy" contractual-obligation compilation album but still rather a good listen.
Very cool video, Bil. "Superposition" is a means of calculating the circuit response of a linear system by computing the contribution of each input separately (shorting the other input voltages), then adding the results up. Two questions for you - what is the mfr and part number of the pin sockets you use on your building block boards? And, same q on the tiny little 3 digit DVMs.. Cool stuff!
Yup. I found if I try to get too much into a tech description while worrying about camera angles, what I am going to say next, etc, I am more likely to say something wrong. (Diode video where I confused the depletion zone with the end of the model and the end of the shot). So I stick close to home base. The terminals are Milll-Max and about a million times better than whats in a cheap solderless breadboard, and the little DVMs are off Ebay. I have started buying them by the handful as I seem to lose a lot also.
Whats funny is when we run a BLS Rescue crew (Ambulance) the minimum allowed is 2 EMTs. Both EMT's can get 99.9% things right and the small foible of one is easily caught by the other. Running just one EMT is like being the only guy in the video, the mistake is there hanging for everyone to see. What made me a good engineer back in the day was the people worked with; they would tell you when your underwear was out on the flagpole and then distill down a whole semester's math class into a statement or two.
Bil Herd I know the feeling. I often have to go back and add a "correction annotation" to my videos to correct something that I mis-spoke about. No checks and balances... If you get a chance, shoot me an email with the particular Mill-Max part number - they've got a million parts, and I'm never sure which ones to get. When I had a "real" job, we had drawers of these things, so I could "borrow" a few when needed.
i guess Im randomly asking but does anybody know a method to log back into an instagram account??
I was stupid forgot the login password. I would love any tricks you can offer me
@Tripp Lorenzo instablaster :)
@Axel Jairo Thanks so much for your reply. I got to the site thru google and I'm waiting for the hacking stuff atm.
Looks like it's gonna take a while so I will reply here later when my account password hopefully is recovered.
Great video Bil. One question- is your analog multiplier the same as a VCA? For instance, after accounting for scaling, can you do the same quality of multiplication with an analog multiplier that you can with an OTA based VCA? Also- would be cool to see something about Log/Antilog amps and their uses- I know you touched lightly on it w/ your slide rule, but I'd be keen to see more. Thanks!
Awesome! I'm here because I read Von Neumann's Computer and the Brain!
nice video! i wish you were my professor at my college :)
Did you use +/- voltage for opamps?
I'd be curious about the full schematic.
Amazing.... 😍😍😍
Great setup.
However, I don’t think your explanation of “virtual ground” was sufficient. The reason the “minus terminal” is at virtual ground is because the “plus terminal” is grounded, and all opamps have 0 volts across their input terminals if operating in the linear region (i.e. not clipping). Because opamps have a very high voltage gain (approximated as infinity), the voltage across the input terminals must always be very small (approximately 0 volts). Of course the high input impedance plays also plays a role, as you mentioned.
Nevertheless, a very instructive video. Thanks.
I am still confused about the virtual ground explanation. Isn't there a voltage drop across the resistor between the + terminal and ground?
You're right.
But the voltage drop between the inverting and noninverting input isn't always zero. It is only zero if the opamp has the chance to regulate the input difference to about zero Volt, this is only possible in a closed loop circuit.
Hi @BilHerd!
Have you ever try to do an analog memory?
Let me explain a little. Suppose than I have a black box composed by one "logic" layer based on AC and a "control" layer based on DC.
Now, this is the question.
If we have a VCO and a AFC at the logic layer, could they be controlled to maintain the frequency by the control layer giving feedback from one layer to the other and viceversa?
If we suppose that the analog values are the frequencies instead the voltages, Could it be considered an analog bit?
(sorry about my english language skill) :)
Thanks in advance!
That should work, but it would end up being HUGE for any decent amount of storage. Imagine 1000. A million. A billion. It gets big fast
NICE VIDEO
voice sounds like hank hill, and i can't unhear it
neat!
question for you , the numbers on the left and the right are visualised by analog or digital circuit?
Nice t-shirt.
I am curios where did you get those voltage displays?
Hello. Is it possible to create analog imitation of memristor?
What type of breadboard is that? Where can i buy one? Looks like a pegboard but holes look like 1/2” apart instead of 1”?
I've been going around the internet trying to understand what an analog computer is and how it works. I still don't understand. I feel like this video should've gotten me one step closer but I guess I'm still too dumb.
An Analog computer is a computer that has an infinite variation of signals. In contrast a digital computer is one that has a limited variation of signals, which are 0 and 1 respectively
interesting!
nice
Let's get it going. Fusion on quantum signal.
👍👍👍
Thanks for making me feel daft lol , Seriously enjoyed though , subbed n liked
Way back when computing was old/
There were no bits nor hot Intel chips/
We did our maths manually cold/
On Napier's Bones we clicked and clacked/
Tidal schedules, artillary tables/
To decimal places we had the knack./
Power will fail your computers and phones./
Be not a young fool. Please get a slide rule./
There's plenty of math in them old bones./
Or op amps!!
1:17
Oh shit Steve jobs is alive
Is that how Reich made the Orgone Accumulator I wonder, we'll never know! ;-)
Appreciated the every day analogy for the virtual ground.
Always liked the idea of Analog computers - often with predictable systems we would be perfectly happy to trade accuracy for sheer reaction speed.
Redolent of the MONIAC modelling the UK economy with a different breed of large analog computer model but based on water flows instead of electrons.
I wish Bill Herd was my neighbor.
Can it run Crysis?
An Analog computer done correctly in theory can run several hundred Crysis games at once, all with the highest graphics and quality settings
@@theshermantanker7043 but why do we do it on digital computers then I m confusion
@@AliKhan-mg3mj because digital is cheaper, can be made smaller, and is more accurate. Analog is more expensive, faster, harder to use to do complex tasks, and less accurate
@@jamesparker8529 less precise*.
It's plenty accurate.
@@samisiddiqi5411what's the difference in this case?
Channel needs more negative feedback for stability.
how do you look older in 2014, lol
May i ask the point of this, why not just get a calculator haha.
Brains unlike digital computers work more like this than regular computers. It is interesting because even if a calculator would be better at doing more logic work when it comes to being more "human like" or whatever this would work better.
just use digital its way better and easier
Good morning