[Jukebox-list] AMI PUSHBUTTON QUESTION

[The Jukebox Junkyard]

    Steve, for the timer not to run out while playing would require it to 
run as long as the longest record. This is much too long for scanning. 
Hence the hold feature. 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 3:39 PM
Subject: Re: [Jukebox-list] AMI PUSHBUTTON QUESTION


> 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
>> >
>> >_______________________________________________
>> >Jukebox-list mailing list
>> >Jukebox-list at lists.netlojix.com
>> >http://lists.netlojix.com/mailman/listinfo/jukebox-list
>> >
>>
>> _______________________________________________
>> Jukebox-list mailing list
>> Jukebox-list at lists.netlojix.com
>> http://lists.netlojix.com/mailman/listinfo/jukebox-list
>
> -- 
> Steve Wahl    steve at pro-ns.net
>
> /* Halley */ (Halley's comment.)
> _______________________________________________
> Jukebox-list mailing list
> Jukebox-list at lists.netlojix.com
> http://lists.netlojix.com/mailman/listinfo/jukebox-list