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Archive for the ‘Electronics’ Category:
2025-03-28 Measuring And Minimising Transistor Switching Loss – Double Pulse Testing
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.
2024-08-21 Adjustable Power Supply Uses Sziklai Pair
This messy bunch of parts is a 0 to 9V adjustable power supply. The original power supply board connected the two transistors in the Darlington Configuration. The unregulated 12V input goes through a 187 ohm resistor to a 10V zener diode to give a stable reference voltage. This voltage is fed to a 2.5k linear
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2024-06-04 Gallium Nitride MOSFETs To Revolutionize Power Electronics
Gallium nitride power electronics will replace silicon and will make laptop power adapters smaller than a golf ball and will save major amounts of electricity. GaN devices will waste a lot less power, which will enable power electronics equipment to be made smaller and more efficient. Quote: “”GaN-based power electronics, on the other hand, could
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2024-05-26 Researchers Invent Mini Tuneable YIG Filter 3.4 to 11 GHz for 6G Datacomm
This is an interesting article: mainly about a miniature Tuneable YIG – yttrium-iron-garnet – filter that could replace many fixed filters. Quote “”Wireless devices use different filters for different frequencies, with the effect that covering all frequencies or bands requires large numbers of filters that take up substantial space. (The typical smartphone includes upwards of
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2024-03-26 HVDC Module Teardown, Operation And Explanation
A 41 min. YouTube video shows operation, tears down, and explains the components. It seems that they are made with cheap chinesium components that are too low voltage ratings so they will fail prematurely if the HVDC is left on a long time or if the spark gap is too wide. Schematic from video is
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2024-03-22 USB Power Delivery Trigger Adapter
Some important information for those who wish to power their projects with a USB C “power delivery” adapter. You may need one of these. This is a YouTube short video.
2024-03-08 FWBR Ripple Calculator Online
This may be helpful when choosing the amount of capacitance for a certain unregulated AC power supply – the kind that uses an old fashioned transformer. It calculates one variable given the others. https://www.chipbuilder.com/full-wave-power-supply-ripple-calculator.html
2023-11-10 Joint Electronics Type Designation System
Here is a wealth of information about much of the electronics that is used by government entities especially the military. You can find out what the system is for data processing hardware. This used to be called JAN – Joint Army Navy. https://en.m.wikipedia.org/wiki/Joint_Electronics_Type_Designation_System
2023-10-19 Telephone Receiver Click Suppressor Varistor
I posted the photo of the back side of the receiver (earpiece) for a Bell System telephone (either 500 or 2500) set. I said that the green blob in my photo (and the ’44A’ metal can in the wikimedia photo below) was used for reducing the volume of loud signals. Well, that’s only slightly correct.
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