Watch the last few minutes of this 18 min. YouTube video to see the advertising on the box that tells what it does. This is really tragic. This multiple tap voltage boost transformer has to be used because the Indian electric grid is so overloaded that they can’t depend on the AC voltage to be
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Book Learn to Build Electronics Projects https://www.facebook.com/100064561517360/posts/pfbid02qmmukKwJbxWMs6HVLU11zNM5xfxdCX7nczjZdejgjrdGzsVs4RV8A7mNNgbTmJnAl/?mibextid=9drbnH&s=yWDuG2&fs=e
Here’s a 17 min. video describing the above in the title. It’s technical and somewhat complicated but calculates the power dissopated during switching. There are a lot of important details, such as the value of the gate resistor. I think I need to do a lot more studying about this topic.
Hot Arcs From Flyback Transformers Play “Take On Me” by Ah-hah. The flybacks are driven by a power amp made for driving these flyback transformers. Looks like just a few turns of 18 AWG wire are wrapped around the bare ferrite cores. A highly effective plasma speaker, better sounding than a Tesla coil. https://www.facebook.com/franzolielectronics/videos/272985324667136/?mibextid=9drbnH&s=yWDuG2&fs=e
He has a strong Aussie accent, a bit hard to understand. It’s a 28 min. YouTube video. He says BD139s have a fT of 250 MHz, but the datasheet I have does not specify any fT because the D in BD139 means they are a low frequency device, not meant for VHFs or RFs in
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https://www.facebook.com/reel/1105829214300191/?mibextid=9drbnH
Long article https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/raytheon-part-one-2 A comprehensive history of the Raytheon corporation. Also information about other companies.
This short uses a CD4026, a 7 segment display, 9V battery, some resistors, an IR LED and a CdS photocell or phototransistor. Break the IR beam and the display advances to the next digit. https://www.facebook.com/reel/525596709839365?mibextid=9drbnH
