Me and my high school friend made a DC to DC converter that would give us 30 or so volts at a couple amps from a 12 volt battery. We used germanium power transistors which could not go much above 10 kHz. The Delco’s and the 2N458A’s were our favorites – we managed to push
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Small modular reactors produce 5 or more times the radioactive waste that full sized reactors produce. https://www.theenergymix.com/2022/06/03/small-modular-nukes-produce-more-radioactive-waste-than-traditional-ones-study-finds/ Quote: ” << Stanford University’s Lindsay Krall, who led the research, said information from the industry is “promotional”, echoing past criticisms that SMRs are still “PowerPoint reactors” with no detailed engineering to back up the concept. “SMR performed
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The Tesla factories are “The machines that make the machines” and Elon Musk, from his own experience, understands how complex and difficult it is to get a factory running smoothly at full speed. Wright’s Law Explained by Ark Investments https://ark-invest.com/wrights-law/ There are good snips of the factory (in Shanghai?) in this YouTube video, especially around
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Also left a comment on JHAT Dec 6. Structural batteries and also integration with motors is a fascinating subject. But it suffers from the same problems that the integrated circuits suffered from over the last several decades. Before the integrated circuits could be highly integrated, the optimal structure had to be determined. Things like 8,
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I worked at a company that built automated test equipment for assembling cables and wiring harnesses. During the year I was there they sent reps to Detroit to help GM build wiring harnesses for Buicks. This was in 1980 and GM was using relays to implement the logic system to assure that the wiring harness
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A year or so ago I bought a few 1W mono amplifiers from a Chinese eBay seller for cheap – see the attached photos. The only marking on the PC board is YX-1667 but I’m not sure if that’s the potentiometer or the PC board itself. . I found that if I pushed the 3.5mm
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I found that 100 uH was a good all around value for these solar garden light circuits. But at the time I made these around 2009 the 5252 4 legged chip was uncommon and almost all the garden lights used 2 discrete transistors. I don’t know why they started using the 4 legged 5252 –
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The beginning isn’t clear about how it looks. First, scroll to end and look at the photo. https://www.randombio.com/capacitor.html
From FB group Vintage Transistor Radios A thought occured. Do you think that Motorola may have had a lot of parts for tube sets and they decided to use them up by putting a transistor chassis in them? If you break down a radio into its assemblies and/or parts, which of them has the highest
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FB comment Years ago at work (community college) we had an IBM mainframe and the terminals were connected with coax cables. We also had thin Ethernet cabling. I had the proper connectors and thousand foot boxes of coax, and most importantly the proper stripping and crimping tools. I installed hundreds of coaxes, and I was
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