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Leonardo2016

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a geriatric technophile
  • Leonardo2016 commented on WilkoL's instructable Tuning Fork Oscillator
    Tuning Fork Oscillator

    Hello richfiddler11, US patent US2971323 gives all the details - mechanics, schematic, waveforms.Not sure what you mean by 'motor'. effectively, the combination of the tuning fork and the drive/sense coils constitute a 'motor', I guess. This is the elegance of the Bulova - a tuning fork, made from Invar for temperature stablity, with two cups at the ends of the tines, encapsulating the coils and magnets, a battery and three components creates a remarkably accurate timepiece. The only complex parts are the 2.4mm diameter 360 tooth ratchet wheel and the incredibly small ruby pawls that drive it. Note that the patent says 300 teeth, I believe this is incorrect since the frequency is 360Hz. All this consumes 5-6 microamps and my battery lasts a year!I attach an image showing the Spaceview whe…

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    Hello richfiddler11, US patent US2971323 gives all the details - mechanics, schematic, waveforms.Not sure what you mean by 'motor'. effectively, the combination of the tuning fork and the drive/sense coils constitute a 'motor', I guess. This is the elegance of the Bulova - a tuning fork, made from Invar for temperature stablity, with two cups at the ends of the tines, encapsulating the coils and magnets, a battery and three components creates a remarkably accurate timepiece. The only complex parts are the 2.4mm diameter 360 tooth ratchet wheel and the incredibly small ruby pawls that drive it. Note that the patent says 300 teeth, I believe this is incorrect since the frequency is 360Hz. All this consumes 5-6 microamps and my battery lasts a year!I attach an image showing the Spaceview where you can see the much prettier fork than that shown in the patent and the three components are on the right - resistor on the top, with the transistor under it, and the capacitor at the bottom, under the tip of the second hand. Drive coils at the top and the fork extending down the centre to the bottom.

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  • Leonardo2016 commented on WilkoL's instructable Tuning Fork Oscillator
    Tuning Fork Oscillator

    My Accutron Spaceview is 360Hz and the fork has two coils, one on each tine. One drives and the other senses. The electronics is one transistor, one resistor and one capacitor - the ultimate in simplicity, and all analogue.

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  • Neat. One suggestion - if you open all your DIP switches R2 is infinite and the output voltage tries to follow suit (crashing close to the input voltage), a bit nasty if you have a low voltage piece of kit on the breadboard. A solution is to have the highest voltage setting resistor permanently wired in place, then the DIP switches add resistors in parallel with it to reduce the vlaue for the other voltages - no more components and completely safe.

    Strange comment - with fundamental breadboard construction with lots of parallel bus-bars inside, any supply noise would be radiated everywhere. My preference would be to minimise noise inputs when using breadboards, otherwise you would spend all your time chasing artefacts instead of learning real things. IMHO.

    Yes, but that's a noisy switcher, not a nice quiet linear device :-)

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  • Sorry to be pedantic, but this is a straight forward levitator, not a Levitron. A Levitron uses no power, just permanent magnets and suspends the spinning object above the main part of the kit.However, your is good too, just not a Levitron.

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  • Leonardo2016 commented on How-ToDo's instructable Simple Tesla Coil

    Being pedantic, this isn't a Tesla coil at all, it is a simple Induction Coil.A Tesla coil works on a totally different principle and generates far more spectacular results and is well worth taking the extra effort to make. Just Google Tesla Coils and you will find dozens of sites telling you how to make one.

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