I bought this HP 721A power supply from an eBay seller for about $40 total. The old timer (dated 12-15-59) needed some TLC – the line cord jacket was frayed and falling off so I replaced it. It’s all solid state, germanium. The case needs to be cleaned up, but it’s got some signs of
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I agree that there is a lot of bureaucracy in California. But it’s there for a reason – many reasons. I think Texas will eventually be the same way when their population continues to grow.
This 13 minute Interview of Sir David King, explaining what *has* happened. He said that when the Greenland Ice Cap melts, the global sea level will rise seven meters (23 feet), which will dramatically change the coastlines of countries. In other words the seas will flood the cities along the coasts.
A Reuters article about a different way of extracting lithium. https://www.reuters.com/markets/commodities/inside-race-remake-lithium-extraction-ev-batteries-2023-06-16/
How to Replace a Transistor (BJT) with a MOSFET Crys Crystii I read that article and he *completely* ignores the gate drive needed to properly switch a power MOSFET on and off. MOSFETs are mosly used for switching high currents, and the time it takes to switch one from nonconducting to conducting *must* be minimized.
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The noise apparently is a whine coming from the inverters. I’ve been working near VFDs – variable frequency drives – and the constant whine is annoying. In this case the whine is legally within acceptable limits. Neighbor dispute risks souring a Connecticut community on solar energy
This Cleantechnica article about research and development advancements on batteries using aluminum-ion and aluminum-sulfur chemistries. German Universities; Lyten company announcing opening a pilot battery factory for lithium-sulfur cells. Quote: “”Aluminium is the most abundant metal in the Earth’s crust and its recycling is easy. Its high volumetric capacity of 8040 mA-h/cm−3 as a negative electrode
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I have absolutely no respect whatsoever for people who claim that wind turbines chop up birds – they do not! The sea birds avoid offshore wind turbines. Wind turbines on land are installing surveillance cameras and when they spot a bird close to a wind turbine, that turbine is shut down. Furthermore, the oil spills
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A month or so ago a guy posted a plea on the Facebook group that he had these pallets of these 12VDC, 1.5 amp switch mode wall warts and he was desperate to get rid of them or he would have to throw them in the trash. He said he would take any reasonable offer
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This article gives a list of articles, studies of renewable energy. 70%, 80%, 99.9%, 100% Renewables — Study Central
