• Diode

    DL10104/20/2018 at 00:00 3 comments

    I got a germanium disc from ebay, and I did a quick test by and found that pointing a scalpel to it it works as a point contact diode!
    It is a bit rough but it works!

    I'll try obtaining something pointy and see if I can get better performance.

  • Cuprous oxide

    Yann Guidon / YGDES02/23/2018 at 12:26 2 comments

    From someone who discussed with the author of "Instruments of Amplification":

    "Friedrichs also had tinkered with cuprous oxide transistors.

    What he didn't tell in the book: only one of 10 cuprous oxide transistors had worked as intended,
    and they tend to die at 5V+ or so. He wasn't aware of this when testing them with a curve tracer."

    OK that also explains why they are not in common use :-D

    But still, 5V is not a crazy working voltage and many circuits use 3.3V.