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Recent content by poor mystic

  1. poor mystic

    Whistle responder circuit

    I like the LM567 Tone Decoder idea, but I doubt that a simple thing like that will really be very reliable. (Of course if you're in a special managed environment like a stage and you can turn on a switch when you want to demonstrate the gadget it'll seem to work fine.) You might be having fun...
  2. poor mystic

    match a cellphone with a waveguide

    ... to filter and amplify my question - I'm a bit confused by the tininess of the antenna on the cellphone circuit board. Through some amazing geometry, there is a match between the tiny antenna and a signal whose wavelength is perhaps 20 times the aerial length. So, can a signal be led down a...
  3. poor mystic

    match a cellphone with a waveguide

    Hi guys :) I want to use a cellphone to test a novel antenna (which I don't want to describe). The antenna will improve the signal from a cellphone tower and feed a waveguide. Does anyone here have experience or knowledge to help me in matching the tiny antenna in the phone with such a signal...
  4. poor mystic

    12v DC Doorbell Chime

    Hi :) I once used a pair of dynamo telephones to do a similar job and more. Twirling the dynamo generated an AC voltage which not only rang the distant bell, but also powered a few minutes speech, so that no batteries were needed. I just put a simple 4 diode full-wave rectifier and a 100V...
  5. poor mystic

    A new approach to seismometry?

    Hi guys (especially Dave) ... not even sure this is really "off-topic" https://www.wired.com/story/how-underground-fiber-optics-spy-on-humans-moving-above/ :)
  6. poor mystic

    source of replacement potentiometer

    Did you try the WD-40 trick? Should be good for a month or 2
  7. poor mystic

    Analog frequency meter

    Ohh those are for getting a generator to run at the right speed. They're a bit like a mechanical tuning fork.
  8. 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...
  9. poor mystic

    The corona. What's the latest?

    What a cool dude you are. Thank you for asking :) I'm okay <3
  10. 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...
  11. poor mystic

    frequency analyzer

    Here's a link https://www.mitchellgolf.com/shaft-frequency-an-absolute-measurement-for-shaft-matching/
  12. 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...
  13. poor mystic

    Collective Components

    a dope of electronics enthusiasts
  14. 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
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