Archive for the ‘Renewable Energy’ Category:

2018-12-04 FETs For Very Low Voltage Joule Thiefs

from FB group Building Transistor Radios 2018 Dec 4 Terry Harris I didn’t try to mimic the ALD, I used the FETs for a voltage booster. The typical 5mm LED needs somewhere around 60 mW for Max brightness. If I was powering it with 60 millivolts, it would require over an amp to get the

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20185-10-13 Limiting Global Warming To 1.5 Deg. C

I was reading this article about the catastrophe that awaits us in the near future, in the next 20 to 35 years. It states that limiting the global warming will be hard, really hard. But it’s something that has to be done if life as we know it is to be saved. As the article

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2018-09-03 Nuclear Power Is Not Economical

from YouTube video TEDx talk comment pro nuclear power, see 2018-09-04 To paraphrase an earlier comment: “Wow! Spread the word! There is so much *left*out* with this talk!” Did you notice he left out any mention of the economic aspects of nuclear power generation? There are THREE nuclear power plants that are sitting partially built

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2018-08-30 Using Radio Signal To Power A Receiver

From FB group Building Transistor Radios 2018-09-01 There are too many ‘gotchas.’ You have to put up a large sized antenna to gather enough power to run the circuit. That means you cannot use this in a city where the properties are too small, due to lack of space. You go to the country where

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2018-07-18 Storage Batteries For Renewable Energy Systems

Reply left on comments for a YouTube Ted talk by Sadoway on molten magnesium – molten salt – molten antimony storage battery David Tiessen Long ago I calculated that the number of solar panels to populate such a large area would be in the billions. But saying it would have to be the size of

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2018-06-16 EMS Isolates Itself Off

From FB group Bell Telephone That reminds me of the EMS we had at the college. The original system used RS-485 around campus. So they started using IP over the network. So at the end of Friday in the hot summer, the Energy Management System tells the A/C units on each bldg to shut down.

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2018-05-11 Tesla Battery Bank Saves Aussies 90%

From article in https://electrek.co/2018/05/11/tesla-giant-battery-australia-reduced-grid-service-cost/amp/

2017-06-08 AD Has ADP5090

Ever since I’ve been experimenting with Joule Thiefs I’ve done so with the intention of using the circuit for boosting a low voltage source to power a higher voltage circuit.  So I think this Analog Devices ADP5090 is very useful for doing just that: powering circuits up to 200 mW from very low voltage power

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2015-12-16 JFET Joule Thief

I captured this off a video and tried to make it a bit more readable.  I think it was from Sanjev. I built it and it does work at 40 millivolts.  The 2SK170 JFETs are not common, and may be difficult to obtain.  Other JFETs can be used, but I haven’t tried them.  I wrote

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2015-11-28 Recharging From Used Alkalines

I have often seen schematics of Joule Thief chargers for use in charging Ni-MH rechargeables from used alkaline cells.  The idea is to boost the voltage of the used alkaline cell up to high enough to get current the flow into the Ni-MH cell.  One setback is that conventional JTs are only 50% efficient, so

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