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The UKHA-ARCHIVE IS CEASING OPERATIONS 31 DEC 2024


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RE: Idea for Poll


  • To: "'ukha_d@xxxxxxx'" <ukha_d@xxxxxxx>
  • Subject: RE: Idea for Poll
  • From: James Hoye <jhoye@xxxxxxx>
  • Date: Tue, 26 Sep 2000 09:39:56 +0100
  • Delivered-to: rich@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

> Oh, and can we add 'first attempts to make a relay-based
> oscillator' (For
> the uninitiated, if you wire up a relay so that the normally
> closed contact
> is in series with the coil, it tends to oscillate, producing
> a suitably
> large 'kick' each time the coil is disconnected.)

I remember a good few years ago messing with an inductor (not understanding
what they did) - dc voltage from a battery is not a good thing to apply to
it - as when you disconnect the magnetic field collapses and you get a good
jolt - enough to light a neon indicator briefly.

Haven't been zapped in the last few years though despite doing a lot of
mains wiring.  Guess that reading the 16th Ed Wiring Regs makes you think
twice about replacing that blown 3A fuse with either a 13A ('cos that's the
only one you can find) or a bit of foil.

James H

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