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  1. Osmium

    Make a latch (flip-flop) using two relays?

    A lot of years ago, I made a flip-flop using two relays and two switches. I think I also had a light globe to show the state! Just like Steve says, think about it... --- Warning: Nostalgia piece... The school radio club used to get a lot of surplus telephone switching gear and other bits and...
  2. Osmium

    Sanwa N-501D

    Then again, since the specs from the radiomuseum link indicate "3 x 1.5v" batteries, it's a fair bet that they are 1.5v types.
  3. Osmium

    Sanwa N-501D

    Curiouser and curiouser... Opened up the meter and discovered a permanently installed (= soldered in) pair of batteries. AA size. In series. Markings all in Japanese, except for "2300" in bold across each. Measured around 2v on my Fluke for the series pair. I'm guessing they're dead - but no...
  4. Osmium

    Sanwa N-501D

    Thank you, quantumtangles. It is a lovely meter. The Japanese site suggests only 1 x 1.5v battery required. The English site says 3. My meter has space for 1 x 1.5v with connectors. Then a further space which would fit a 9v battery (as for the N-501) - but no connectors. I'll open it up on the...
  5. Osmium

    how to signal an alarm at point

    Yes, but thinking about it after your post, I figured that a pair of receivers might enhance the accuracy so I had a quick google and came up with this: http://arxiv.org/pdf/1207.2761.pdf which concludes: And apparently there are gps "augmentation" systems in place which can improve things...
  6. Osmium

    how to signal an alarm at point

    Then again, two radio linked gps units could be used to monitor distance between any two points... So long as we have gps... and as long as the radio system doesn't fail... and so long as it's ok to have gear at each point... and so long as it's on earth.. or near earth... etc... - Roy...
  7. Osmium

    Sanwa N-501D

    Picked up a Sanwa N-501D multimeter at a country market yesterday. Meter movement itself seems ok - but the instrument needs a bit of tlc. Anyhow, I was wondering if anyone has any details about this model? Specs, user manual and so on. Google shows me some pictures but not a lot else. There...
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