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  1. vu2nan

    Generic timer switch?

    You need to use a 'true off-delay' timer, that is available 'off-the-shelf'. Here's the schematic. When the push button switch is momentarily actuated, the timer contact closes and the load is energised. The load is de-energised when the timer contact opens after the set time has elapsed...
  2. vu2nan

    switching relay

    Hi nfsus, An SPDT spring-return switch with centre off, a magnetic latch relay and an electrolytic capacitor would be required. In one end position of the switch, the capacitor charge pulse will set the relay and in the other end position, the capacitor discharge pulse will reset it. Nandu.
  3. vu2nan

    My RF Ammeters

    Thank you very much, OM Jeff. 73, Nandu.
  4. vu2nan

    My UHF Antennas

    https://nandustips.blogspot.com/p/my-70cm-antennas.html 73, Nandu.
  5. vu2nan

    My SWR Meters

    https://nandustips.blogspot.com/p/my-swr-meters_14.html 73, Nandu.
  6. vu2nan

    My RF Ammeters

    https://nandustips.blogspot.com/p/author-profile_14.html 73, Nandu.
  7. vu2nan

    My VHF Antennas

    https://nandustips.blogspot.com/p/my-2m-antennas.html 73, Nandu.
  8. vu2nan

    A selection of my QSL cards

    Yes, OM Dave, those days it was possible to have an hour long CW ragchew with a stateside station feeding only 50 W to a dipole antenna on 20m. Many thanks. 73, Nandu
  9. vu2nan

    A selection of my QSL cards

    Here's a selection of my QSL cards. Those were the days! 73, Nandu.
  10. vu2nan

    My vintage shack!

    Thank you very much! 73, Nandu.
  11. vu2nan

    My vintage shack!

  12. vu2nan

    How I became a ham

    My pleasure, wavrider! 73, Nandu.
  13. vu2nan

    'Gibson Girl' Crystal Radio

    My pleasure, Sunbulls. I did feel like I was breaking a priceless heirloom which I had possessed for 40 long years. Last month's quote for one was $125.00! Regards, Nandu.
  14. vu2nan

    'Gibson Girl' Crystal Radio

    Here's the link. https://nandustips.blogspot.com/2016/04/gibson-girl-crystal-radio.html 73, Nandu.
  15. vu2nan

    Current-operated 'S' Meter for Crystal Radios

    Broken link rectified. https://nandustips.blogspot.com/2016/02/current-operated-s-meter-for-crystal.html 73, Nandu.
  16. vu2nan

    Crystal Radio Output Transformer

    Broken link rectified. https://nandustips.blogspot.com/2015/09/crystal-radio-output-transformer.html 73, Nandu.
  17. vu2nan

    A Makeshift Crystal Radio Output Transformer

    Broken link rectified. https://nandustips.blogspot.com/2015/09/a-makeshift-crystal-radio-output.html 73, Nandu.
  18. vu2nan

    Loudspeaking Crystal Radio

    Broken link rectified. https://nandustips.blogspot.com/2014/08/crystal-radio-through-speaker.html 73, Nandu.
  19. vu2nan

    Another Crystal Radio Variant

    Broken link rectified. https://nandustips.blogspot.com/2015/10/another-crystal-radio-variant.html 73, Nandu.
  20. vu2nan

    Another Series-tuned, Shunt-fed Crystal Radio

    Broken link rectified. https://nandustips.blogspot.com/2015/10/another-series-tuned-shunt-fed-crystal.html 73, Nandu.