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  1. Xeno Xenox

    Mysterious vacuum tube

    A friend found this vacuum tube on the beach near San Francisco. Can anyone help me ID it? Anything would help -- function, age, manufacturer, etc. I haven't seen it in person yet, so I can't say whether it has any legible markings.
  2. Xeno Xenox

    Replacement relays?

    I'd like to find a replacement for this relay: The markings on the relay are: 80B43249S01 611-1217HQ CDE 24VDC MEXICO 718 Using a digital caliper, the outside measurements of the relay (not including the pins) are: W: 30.64 mm D: 18.90 mm H: 29.39 mm The relay has five pins on the...
  3. Xeno Xenox

    My Avatar

    I needed an avatar for Electronics Point and wanted something with a personal touch that was also relevant to the audience. I've always been fond of hypercubes, so I thought it would be fun to generate one on my scope and capture the bitmap for my avatar. Earlier today, I wrote a program to...
  4. Xeno Xenox

    Are product recommendations off-topic?

    I have several cheap multimeters and I'd like to invest in a high quality upgrade. My primary use case is low-voltage (under 15V / 1A) electronics, but I'd like something I can safely connect to any of my house mains (in the United States) and to higher voltage circuits in household devices...
  5. Xeno Xenox

    Clean square waves using a 555 timer?

    I'm experimenting with simple circuits to generate square waves, for use as inputs and clock sources for use in more complex circuits. I tried the "50% Duty Cycle Astable Oscillator" based on a 555 timer from this site: http://www.electronics-tutorials.ws/waveforms/555_oscillator.html Here's...
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