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  1. poor mystic

    The corona. What's the latest?

    I'll cross my fingers and continue to work my garden; belt & braces engineering has always suited me. I believe that preparations for hard times ought never be neglected, for crops that might have been essential in the worst case are a delight when society continues to run smoothly, and fresh...
  2. poor mystic

    The corona. What's the latest?

    What a cool dude you are. Thank you for asking :) I'm okay <3
  3. poor mystic

    The corona. What's the latest?

    The trouble I'm actually trying to prepare for has to do with trade disruption. International trade might at any time be hit by extreme weather, war or fear of pandemic, and while that's always been somewhat true, the world just seems ready to go up right now. I think the virus must eventually...
  4. poor mystic

    frequency analyzer

    Here's a link https://www.mitchellgolf.com/shaft-frequency-an-absolute-measurement-for-shaft-matching/
  5. poor mystic

    The corona. What's the latest?

    Hi guys :) big smiles, hearts, etc I'm scared. My world is looking a bit out-of-control. Its mostly got to do with social disruption in the context of current events, in turn mostly coronavirus. I'm concerned about possible major disruption to trade, so my personal response must include hedges...
  6. poor mystic

    Collective Components

    a dope of electronics enthusiasts
  7. poor mystic

    Frankenstein's Components.

    that is both the most utterly beautiful and the most astoundingly ugly piece of equipment I have ever believed in wow
  8. poor mystic

    Chip Burns Out

    Static discharge damage is permanentl and is usually caused by unprotected handling when the board is not connected. When handling sensitive boards and components special precautions need to be taken which I’m sure are described elsewhere. Others are better qualified than I on the matter of...
  9. poor mystic

    Frequency response ?

    Questions of personal safety aside (and I personally have often done fantastically dangerous things, which I got away with), I've just remembered this: https://www.wired.com/2017/02/malware-sends-stolen-data-drone-just-pcs-blinking-led/ which might be of interest :)
  10. poor mystic

    Frequency response ?

    I am well aware that light can be modulated and demodulates at far greater.rates than can radio; my only objection to lasers is that they are more dangerous than radio, to experimenters.
  11. poor mystic

    Frequency response ?

    Hi guys Obviously, the diodes used in high speed data transmission have entirely different characteristics to the ordinary diodes described in Duke37's data sheet. Still i like the idea of using such ordinary devices because they are adequate up to useful speeds and they are not lasers. I'm very...
  12. poor mystic

    How to create 3D omnidirectional antenna set?

    In some countries, including Australia I have heard, the use of the telephone network for drone control is unlawful. BTW may I say I have seen what I call good sense on this thread. :)
  13. poor mystic

    Comedy Thread

    Almost. "x" is the Unknown Quantity. :-) I had this from a professional.
  14. poor mystic

    Op amp problem ua741

    Let's not bicker, this is a nice place. :-)
  15. poor mystic

    Frankenstein's Components.

    I accidentally discovered a method of raising the resistance of metal-film resistors while building a prop for a TV advertisement. I tried to set off a little bit of flash powder with a low voltage and a low resistance element in the form of a 100 Ohm metal film resistor, but found that the...
  16. poor mystic

    Electronic starter kit

    Hi I suggest you post a set of pictures, especially showing the power supply. Please make sure that all the numbers on the power supply are visible in the photos. A few photos of all the other stuff would be good, too.
  17. poor mystic

    Omnidirectional Ultrasonic transmitter

    Maybe the op wants ultrasonic intranet, which would be great if it would work. Those 40kHz ultrasonic transducers have very limited bandwidth, unfortunately - the 3dB points are usually at about 38 and 42kHz, I think. The passband is hardly flat, also, which doesn't help anyone. I guess you...
  18. poor mystic

    Omnidirectional Ultrasonic transmitter

    Hi Bob. Why does 10mm seem significant? I'm sure it's not... The only job of the pair of discs is to channel sound waves from the centre of the apparatus to the edge, from whence they'll be radiated away to parts unknown, and other ultrasonic stations. Sound waves follow easier rules than...
  19. poor mystic

    Op amp problem ua741

    I have no axe to grind, but the data sheet I linked does guarantee rail-to-rail input voltages for many applications.
  20. poor mystic

    Old "Kay" guitar amp question

    Does the amp go? If the amp goes and the guitar sounds good through it, your measurements are very educational. :-)
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