generuso

6 ms·

31.
by generuso 5mo ago
The point is not that silicon is not suitable for extreme cold -- it is, with careful design. But the authors want to use a semiconductor which would operate at much higher temperatures than silicon can. And most of these have a disadvantag
32.
by generuso 5mo ago
Exactly. In physics, when people measured things at 4K, there were many examples of active circuits built to measure or amplify things in situ at 4K, and only send the results out, often by the same wire that was used to power the circuit.
33.
by generuso 5mo ago
It was unintentional, but it is actually kind of true in his case. The guy is a founder and the CTO of two semiconductor companies.
34.
by generuso 6mo ago
In the "real" DRAM chip, there is a large array of very tiny capacitors, with the switches which allow to connect one row of the array at a time to the readout column wires. The capacitance of the wires themselves is typically an
35.
by generuso 6mo ago
It is not really feasible to fabricate usable integrated circuits at home. There is a huge difference between a one off demonstration of a principle that "sort of works", and perfecting the process to the point that it produces fi
36.
by generuso 6mo ago
Of course it not easy. He spent $20k on materials and a good amount of elbow grease just to construct this one room. In order to maintain the clean environment the air circulation runs 24/7 and he washes all the surfaces daily using c
37.
by generuso 6mo ago
The furnace is a low cost off-the-shelf Chinese product from Anhui Beq Equipment Technology Co. Much more impressive are the modifications to the microscope, transforming it into an improvised lithography machine, and the home made plasma e
38.
by generuso 6mo ago
Pure hydrogen in a balloon produces a low, loud, very satisfying bang. Completely different from a sound of an air balloon popping. Here is a video from a very good Royal Society of Chemistry demonstration series on various unusual combusti
39.
by generuso 6mo ago
There are many cases in the news of accidents with sometimes a large number of party balloons filled with hydrogen or other flammable gases. One of the larger episodes was in 2012 in Armenia, where thousands of balloons exploded during a me
40.
by generuso 7mo ago
Starlink project began after Musk and Greg Wyler parted their ways. Wyler approached SpaceX in 2014 with a proposal to build OneWeb (then called WorldVu), and initially they worked on the project together. But then they started to accuse ea
41.
by generuso 7mo ago
Heat capacity is irrelevant -- argon and helium have exactly the same heat capacity per liter of gas, which would be the figure of merit in this context. Heat conductivity, on the other hand, is an order of magnitude higher for helium, comp
42.
by generuso 7mo ago
Sure. Line scan indoor units are extremely affordable, and some cost less that $20, sold as spare parts for robot vacuum cleaners. Outdoor units (with higher ambient light tolerance and longer range) are an order of magnitude more expensive
43.
by generuso 7mo ago
The efficiency of X-ray tubes is proportional to voltage, and is about 1% at 100kV voltage. This is the ballpark for the garden variety Xray machines. But the wavelength of interest for lithography corresponds to the voltage of only about 1
44.
by generuso 8mo ago
Neato from San Diego has developed a $30 (indoor, parallax based) LIDAR about 20 years ago, for their vacuum cleaners [1]. Later, improved units based on the same principle became ubiquitous in Chinese robot vacuums [2]. Such LIDARs, and si
45.
by generuso 8mo ago
You could [1], but it is not very cheap -- the 32GB development board with the FPGA used in the article used to cost about $16K. [1] https://arxiv.org/abs/2401.03868
46.
by generuso 8mo ago
LSI Logic and VLSI Systems used to do such things in 1980s -- they produced a quantity of "universal" base chips, and then relatively inexpensively and quickly customized them for different uses and customers, by adding a few inte
47.
by generuso 8mo ago
The document referenced in the blog does not say anything about the single transistor multiply. However, [1] provides the following description: "Taalas’ density is also helped by an innovation which stores a 4-bit model parameter and
48.
by generuso 10mo ago
It is not the same kind of equipment. ASML machines use a 500 watt EUV source in order to be able to expose a few wafers per minute. The tabletop device has the output power listed as "1 uw-10 mw". This is a source intended of spe
49.
by generuso 11mo ago
One of their patents describes exactly that -- driving a hardened stud into the softer metal of the deck, essentially by using a gunpowder actuated nail gun: https://patents.google.com/patent/US20240092508A1/en Th
50.
by generuso 11mo ago
The idea was always appealing, but the implementation has always remained challenging. For over a decade, "Mythic AI" was making accelerator chips with analog multipliers based on research by Laura Fick and coworkers. They raised
51.
by generuso 1y ago
From what I have seen, Ethernet ports always have a small isolation transformer for each twisted pair, between the connector and the PHY. Usually four of such transformers are combined in one small magnetics package. The insulation in the t
52.
by generuso 1y ago
It all started with ELIZA. Although Weizenbaum, the author of the chatbot, always emphasized that the program was performing a rather simple manipulation of the input, mostly based on pattern matching and rephrasing, popular press completel
53.
by generuso 1y ago
One of the popular speech-to-text models is Whisper, which starts with the conventional spectral analysis of the speech signal, and then feeds the data into a Transformer model. It works quite well. https://openai.com/index&
54.
by generuso 1y ago
Mainstream oscilloscopes typically have sampling frequency at least five times greater than the bandwidth of the analog front-end. For example 1 GHz bandwidth oscilloscope will have sample rate of 5 GSps. https://www.tek.com&#x2F
55.
by generuso 1y ago
Quite right. There are many different kinds of depth sensors in addition to the canonical old school rotating mirror LIDAR. I think some of the short range depth cameras (Kinect v2 was one) use time-of-flight technique, and could in princip
56.
by generuso 1y ago
Yes, the laser was fired at 3 KHz, while the mirrors were slowly scanning across the room. For each laser pulse, one microsecond of the received signal was digitized with the sample rate of 2 billion samples per second, producing a vector o
57.
by generuso 1y ago
What this experiment does is very similar to how an ordinary LIDAR unit operates, except that during a LIDAR scan the laser and the receiver are always pointed in the same direction, while in this demonstration the detector is scanning the
58.
by generuso 1y ago
You should check the other channel by the same person, where he goes into more details about the system: https://www.youtube.com/@BetaPhoenixChannel From what I remember, recording one frame took about an hour.
59.
by generuso 1y ago
The author explained that he originally attempted to pulse the laser at 30 KHz, but for the actual experiment used a slower rate of 3 KHz. The rate at which the digital data can be read out from the oscilloscope to the computer seems to be
60.
by generuso 1y ago
The author uses "real time sampling" to acquire evolution of light intensity for one pixel at 2 GSps rate. The signal is collected for approximately one microsecond at each firing of the laser, and corresponding digital data is se

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