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  1. Xeno Xenox

    Replacement relays?

    I removed the bad relay from the microwave oven and took photos of the pins. The relay was marked with its voltage and current specs, but the part number didn't turn up in any web searches. I searched through hundreds of relays online and asked friends to help me search as well. Once I found a...
  2. Xeno Xenox

    Replacement relays?

    I just realized I never posted the promised update! This replacement relay worked great and I fixed my microwave. However, after three years, it just broke again this week -- possibly with a blown fuse. I will dig in this weekend. :)
  3. Xeno Xenox

    Morse code reader

    Can you share the reason you want to avoid Arduinos entirely? If the reason is because you want to avoid programming, that would rule out microcontrollers generally, including Arduino, ATtiny, etc. If you are trying to avoid Arduinos specifically and are comfortable with programming, you can...
  4. Xeno Xenox

    Clean square waves using a 555 timer?

    I am the original poster. It's been two years, but I'm still following the thread. :) I look forward to seeing your results! :)
  5. Xeno Xenox

    Morse code reader

    These chips don't require an Arduino, but that's certainly an inexpensive approach to programming them. Is that a concern for you? I assumed you only wanted to avoid Arduinos in the final circuit -- not as an intermediate step in your tool chain.
  6. Xeno Xenox

    Morse code reader

    Hello! I'm a ham (W6ARY) and I would use an ATtiny: https://en.wikipedia.org/wiki/Atmel_AVR_ATtiny_comparison_chart These chips are made by Atmel, the same company that makes the ATmega used in Arduinos, but the ATtiny is much smaller, simpler and cheaper. A six or eight pin version would be...
  7. Xeno Xenox

    Mysterious vacuum tube

    I think we figured it out. It appears to be an RCA Radiotron UX-171-A, used in the final stage of radios and televisions for audio amplification. http://www.nmr.mgh.harvard.edu/~reese/RC10/RC10-76.GIF
  8. 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.
  9. Xeno Xenox

    Replacement relays?

    @Minder: My son's scout leader found this one on eBay (although these photos are from another source): I seems like a good match, in dimensions, pin-out, pin shapes and best-guess specifications, so I ordered a few. I'll post an update after I receive them and try them out.
  10. Xeno Xenox

    Replacement relays?

    @(*steve*): The links provided by @Minder were not Digikey links. Those links are to TEDSS, a discount component site that doesn't list any specifications or links to datasheets. There are no CDE relays listed on Digikey and I haven't yet found any relays on Digikey with the same pinout as...
  11. Xeno Xenox

    Replacement relays?

    @Minder: Thanks for the links. Yes, that relay looks similar, but I can't find any specifications either for it or for the relays I want to replace. Do you (or anyone else) know of a good site for getting specs on relays, both current and out of production?
  12. 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...
  13. Xeno Xenox

    Clean square waves using a 555 timer?

    @MIL-Q Thanks for letting me know! If I experience side effects in a practical circuit, I'll give your solution a try!
  14. Xeno Xenox

    My Avatar

    I used R = 1K and C = 0.1uF, which gives a cut-off frequency around 1600 Hz. I used a Rigol DS1102E oscilloscope in X-Y mode to view the waveforms. The hypercube images you see are bitmap screen captures directly from the scope to a USB thumb drive. The wires you see in the circuit photo...
  15. Xeno Xenox

    My Avatar

    Absolutely! I believe the only difference is the ATtiny85 has four times as much memory as the ATtiny25.
  16. Xeno Xenox

    My Avatar

    For the circuit version, I used an ATtiny25 with RC low-pass filters connected to two PWM outputs: The resulting scope trace is noisier, but it's quite recognizable: To answer the question from @bigone5500, I based my design on information gathered from the ATtiny25 datasheet, the book...
  17. Xeno Xenox

    My Avatar

    That is another way to render a hypercube in 2D. The difference is that mine is an orthographic projection and the one you described is a perspective projection. The same applies to drawing a cube in 2D. You can draw two identical squares whose corners are connected with diagonal lines...
  18. 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...
  19. Xeno Xenox

    Clean square waves using a 555 timer?

    I should add that C1 = 22nF and R2 = 1K ohm.
  20. Xeno Xenox

    Clean square waves using a 555 timer?

    I apologize for the delay in soldering up the circuit. My son discovered amateur radio and so I've been immersed in that for the past month. On the upside, I'm now a licensed ham! :) This is the circuit I built, except that I added 10uF tantalum + 100nF ceramic bypass capactiors. Here's...
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