Quartz Chiming Movement - Hand Sensing Detection?


A friend recently aquired a tall case clock with it's dial still in place, but with the mechanical movement missing.

I bought a battery powered quartz movement from Klockit and fitted it into his clock. It works as intended, and he's pleased with the results:

http://www.klockit.com/products/dept-158__sku-BBBSS.html

My curious mind wants to know what sort of sensing this kind of movement uses to know where the minute and hour hands are pointing so that it can "strike" the correct number of chimes through it's little speaker.

The striking is definitely linked to the hand positions, as it comes out correctly even if the batteries are removed for a while and then replaced.

Do they use a commutator type rotating switch, or perhaps a low power slow rate blinking LED and a photosensor looking for light to come through some sort of rotating mask(s) tied to the hand shafts?

Thanks guys,

Jeff
--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."
.

Relevant Pages

  • Quartz Chiming Clock - Hand Position Sensing?
    ... A friend recently aquired a tall case clock with it's dial still in place, but with the mechanical movement missing. ... I bought a battery powered quartz movement from Klockit and fitted it into his clock. ... My curious mind wants to know what sort of sensing this kind of movement uses to know where the minute and hour hands are pointing so that it can "strike" the correct number of chimes through it's little speaker. ... Do they use a commutator type rotating switch, or perhaps a low power slow rate blinking LED and a photosensor looking for light to come through some sort of rotating masktied to the hand shafts? ...
    (sci.electronics.equipment)
  • Re: Our Perception of Time
    ... When you watch the clock at work, ... So what sort of empirical testing has been done to try and discover the ... In proper time when rate slows down it is not apparent to the frame ...
    (sci.physics)
  • Re: Prayer warrior!?!?
    ... Natalie is as naive or as "stupid" as Jordo is in some areas. ... if the clock or watch isn't digital she can't figure out the time. ... same sort of things during the game and after it. ... I wonder if you need to learn analog time at a young ...
    (alt.tv.survivor)
  • Re: Prayer warrior!?!?
    ... Natalie is as naive or as "stupid" as Jordo is in some areas. ... if the clock or watch isn't digital she can't figure out the time. ... same sort of things during the game and after it. ... I wonder if you need to learn analog time at a young ...
    (alt.tv.survivor)
  • Re: time limited netlist generation
    ... The only defense I can see is requiring some sort of confirmation ... over the network. ... Even if the CAD tool vendors do support it, ... number of clock cycles after FPGA initialization. ...
    (comp.arch.fpga)