[Jukebox-list] AMI PUSHBUTTON QUESTION

[Steve Wahl]

Cool solution, Wes!

I imagine you could just reset the timer on exiting play mode as well
as on making a selection and it would work just as well; might be less
complicated circuitry than "holding" it while in play mode.

I'm a software engineer, but I often work close to the hardware
(i.e. I have to read schematics sometimes).  Over the years, fellow
software types have taught me to loathe "one-shot" timer hardware
circuits (which your solution resembles somewhat), saying a hardware
engineer wasn't really doing his job if he had to throw in a kludge
like that.

But I'm starting to think that position is a bit overstated.  I'm
discovering some pretty interesting designs using timers are out
there.  

(I've recently become re-interested in my first computer, an Ohio
Scientific C1P from 1978 or so; the schematics make a lot more sense
to me now than they did then.  There's a few examples of this kind of
timer usage in there, too.  I'm not saying that OSI was a great
example of elegant design or anything, but there's a few things in
there I understand, and appreciate, a lot better now.)

--> Steve

On Tue, May 15, 2007 at 02:34:55PM -0400, The Jukebox Junkyard wrote:
>   Steve, all your suggestions would work. But I use my mechanism timer that 
> I developed for pre-tormat Seeburgs, adapted to the AMI circuits. The timer 
> is reset upon making a selection and held in play position to prevent the 
> timer from running out while the record is playing. I only did this because 
> the bail switches were beyond repair.
>    I also use this principal on the V/VL because the original scan control 
> is so hard to work on. Wes
> ----- Original Message ----- 
> From: "Steve Wahl" <steve at pro-ns.net>
> To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
> Sent: Tuesday, May 15, 2007 10:41 AM
> Subject: Re: [Jukebox-list] AMI PUSHBUTTON QUESTION
> 
> 
> >On Tue, May 15, 2007 at 09:29:51AM -0400, Wesley Dean wrote:
> >>    Steve, we have an AMI E-120 operating without bail switches. Wes
> >
> >OK, Wes.  You've got me curious.  "So how does it keep from scanning
> >continuously when there's no selections?" is the question that comes
> >to mind, of course. :-)
> >
> >I believe the physical changer mech was either identical or nearly so
> >to my F-120, right?
> >
> >My first guess is you've adapted the seeburg style "set a counter to
> >two when a selection is made, subtract one when you change scanning
> >direction (or maybe each scanning pass?), keep the mech powered until
> >you've counted back down to zero" approach to this mechanism.  There's
> >not a nice, pre-existing switch contact to hook onto for the "subtract
> >one when you change direction" part of that solution, though.  Perhaps
> >an intrerupted optical beam...
> >
> >So...  How?  :-)
> >
> >--> Steve
> >
> >-- 
> >Steve Wahl    steve at pro-ns.net
> >
> >Creativity is allowing yourself to make mistakes.
> >Art is knowing which ones to keep.    -- Scott Adams
> >
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-- 
Steve Wahl    steve at pro-ns.net

/* Halley */ (Halley's comment.)