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About arrayschism

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    Software, running, electronics, astronomy (obvs!), motorcycles and engineering in general
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  1. Re the MOSFETs, I bought the Fairchild, FQP30N06L types as suggested and they oriented as indicated on the silk screen.
  2. The flat earth belief is just one of any number of bizarre beliefs that these sorts have. The problem is, as said above, a distrust in (experimentally provable) reality - a general problem of the mind that would hang onto any strange idea. Feels like this is exclusively the reserve of the mentally ill (who deserve medical attention) and the easily influenced (who need a dose of scientific education).
  3. An intervalometer for my travel wide field set up Just in time for the cloudy weekend, of course!
  4. I would advise that you use the relay to actuate a 240V contactor. It's exactly what we do at work where we have PLCs that control large currents via 12v or 24v relay lines. PLC switches relay, relay switches contactor.
  5. Google? Pah! Google can't yet beat the SGL hive mind Thanks all!
  6. Brilliant, thanks all!!! I'll be able to sleep now
  7. I am making a cover for a box to go outside as part of my pier. I've used (but never bought) these fixings before to hold down plate steel panels and thought they would do the job. Thing is... I don't know what they're called so struggling to look for them. The basic idea is that the pin pushes through a hole. Once the other side, the internal tab rotates 90 degrees and drops down, locking the panel into place. I apologise for my terrible drawing skills, but I've done my best "artistic" impression. Any idea what these are called?
  8. Super thread @JamesF, I'm on with building one of these at the moment. That's a lovely box you've got there - 3D printed at home I take it? Those diode legs were rather large, as you'd mentioned in another thread. I managed to drill out the PCB with a 1.3mm drill to fit them on the board, rather than having flying leads Anyway, great job - can't wait to see the finished product!
  9. A lot of advertising is based just on location, age demographic & so on.
  10. The DHT series are, IMO, pieces or rubbish, unfortunately. Not made for long term use in outside conditions. I've had more success with the HTU21D of late. Far more robust. They are a little more expensive, but you get what you pay for https://shop.pimoroni.com/products/adafruit-htu21d-f-temperature-humidity-sensor-breakout-board
  11. Circuit boards for the home build dew controller (Rob Brown's). Excellent service from JLCPCB, less than excellent service from DHL. Still, they found their way to my work after a few days of suspense... Really looking forward to getting on and soldering it all up
  12. @JamesF We install switches at the end of the travel to prevent our operators overrunning the rails - could be an expensive incident otherwise
  13. @Gina wow! Those are cheap - I use rather bigger versions of these at work. I hope that these ones from Amazon come with the small plastic insert that prevents you losing all the bearings should you slide them completely off the rails!
  14. Thank you James, I shall watch out for that. The PCB arrives next week - hopefully the diodes I already have will fit. Their legs are pretty slim If not then I'll have a go at doing what you did.
  15. Go for it - better that than regretting not having done in 30 - 40 years. The Open University has a good site to give you an idea of the expected starting levels re maths content: http://mathschoices.open.ac.uk/ OU study is hard work, especially when combined with a working day and home life, but incredibly rewarding, and you never know where degree study will take you. I studied as an electronic and electrical engineer, did one first year semester of programming (loathed it). 10 years later ended up as a software engineer. Didn't expect that
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