the alpha syntauri system
  a ancient synthisizer concept for the Apple II		    Page No.:H212-1
 
         details about the keyboard and the footswitches  
     
Here we can inspect the later version of the keyboard. This later version has 61 keyswitches.
There has also been a earlier version sold with 48 keyswitches.
 		  
  Lets startup with some pictures of the keyboard itself:



after removing the top plate you will see this:



a closer view to the right upper side will offer this view:



Before taking a closer view to the other internal parts of the keyboard lets just take a closeup view to the Footswitch pedal connectors, while being extracted:



Then after refitting the top plate and turning the keyboard around to the bottomside, lets take a view after the bottom plate has been removed:



Next a closer view to the "giant PCB" that connects the keyswitches together - and we can drop the demand to examine the entire board -
because it's along it's entire length eveywhare the same basic principal. there for here only one section in closeup view:


 
This pisture displays that each keyawitch is related to one rectifier diode.
The next picture displays a closeup to the keyswitch itself with a closeup view from the rear:



and to get a better view to the important part of the keyswitch now a closeup view in detail from the front:



This picture shows in detail the manner the keyswitch is operating:
If the key is released the long steelwire from the PCB is right between the long steelwire bars above and below of the wire.
If the kay becomes pressed down the wire moves towards the upper steelbarwire and makes contact with that steelbar wire.
Be aware that this view is reverse view to normal postion. In normal postion the upper steelbar wire is the lower steelbar wire !

The mechanical creation of the keys ( better keyswitches ) in the alpha syntauri is quite comparable to the description of the DIY procedure of the piano-keyboard of the FORMANT as explained in the magazine elektor. This is explained here in the publication of that device at page 2 of that scanned pages. Allthough the pages are still in German language the drawings are quite clear and selfexplaining.
 
       Here are closeup pictures of the opened Footswitch:

 

  
     
   
       
      
       
       
 
         
         
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