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  1. Obit

    What are these?

    Can't post pics cause problems on your end. Probably my phone takes too large images. They are little metal cubical boxes with a black ball inside. the ball is not loose but held behind a metal cage. there are 3 pins eminating from them. the number 3 is stamped on the front. No other markings...
  2. Obit

    My first circuit is a bit advanced (H-bridge!)

    Hello, I am teaching myself electronics. I have been reading for several weeks because anybody can build an elementary circuit that turns on an LED, I just kept reading. Electronics is so fascinating and logical, but my simple brain can only handle so much and at last I have become motivated to...
  3. Obit

    A few questions about the allocation of frequencies

    I am looking at this chart; https://www.ntia.doc.gov/files/ntia/publications/january_2016_spectrum_wall_chart.pdf Why is the lowest kHz "not allocated" and what does that mean? What do the pink areas labeled "fixed' mean? Thanks
  4. Obit

    Seeking virtual tours through various circuits.

    In trying to learn electronics, and various circuits I am amazed yet ever confused. I read an article then that was both colorful and descriptive that brought you down to the level of the current and sent you through the course. It was exciting and refreshing and made the math clear unlock the...
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