[Jukebox-list] AMi Pluse system

[Ron Rich]

Another thought---the "sprague relay" (SHOULD--they tend to "slip",sometimes) mechanically "locks" the gears, and thus the two wipers into the correct position until after the selection hammer coil is fired. Ron Rich

Ron Rich <ronnnrich at yahoo.com> wrote:  Karl,
Just going to add one thing that may help-- Where David says "-- each of the two contacts are aligned---" ( this causes the "sprague" relay to energize, which starts the selection motor) "now the the selection arm starts to rotate--" Otherwise it's a much better explaination then mine--way to go! David Ron Rich

Karl wrote:
David
Sorry but the telephone analogy doesn't help.....hehehe. Your explanation 
does though. Between you, Ron, Wes, and the book, my thick skull is 
beginning to absorb it. Thanks

----- Original Message ----- 
From: "David Breneman" 

>
> --- Karl wrote:
>
>> I have the manual but I am having a hard time understanding
>> the "Pulse" concept. It sounds like it allows the converter to
>> rotate longer or shorter depending on the letter/number chosen??? I
>> admit this is probably fairly elementary to those who know these
>> older jukeboxes, but I don't.
>
> So if I was to analogize it as a two-dimentional Strowger
> telephone switch, that wouldn't help? :-)
>
> The selector sends a series of pulses. Just square-wave
> AC pulses. I assume the H is the same as the G. So A
> is one pulse, B is two pulses, etc. The selection
> receiver rotates a rotary switch via a ratchet/pawl
> mechanism, one notch for each pulse. Then there's a
> pause between pulses, so the receiver now switches to a
> second ratcheting rotary switch. Which does the same
> thing for the number part of the selection. 5 is five
> pulses, 8 is eight pulses, etc. When the pulses stop,
> each of the two rotary switches is aligned over a set
> of contacts unique to that selection. Now the selection
> arm starts to rotate over the pinbank. It also has two
> rotary switches connected to it. When those switches
> receive voltage from the first two switches, it means
> that the selection arm is over the pin corresponding
> to the selection made. The pin is pushed, the first
> set of rotary switches is released, and the machine is
> ready to accept another selection.
>
>
> David Breneman david_breneman at yahoo.com
>



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