CGS organ interface: Difference between revisions

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[[File:cgs_panel_organ_interface.jpg|thumb|right|102px|]]
 
[[File:cgs_panel_organ_interface.jpg|thumb|right|102px|]]
The '''CGS organ interface''' was created to give Ken Stone a convenient way to interface an early 1970s <!-- citation.html -->[[Lowrey Citation Theatre Spinet]] to the synth. From top to bottom there are connections for:
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The '''CGS organ interface''' was created to give Ken Stone a convenient way to interface an early 1970s Lowrey Citation Theatre Spinet to the synth. From top to bottom there are connections for:
 
* Lower Manual output
 
* Lower Manual output
 
* Rhythm Unit
 
* Rhythm Unit
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** Main
 
** Main
   
The lower manual output is a mixture of 8' and 4' unfiltered square waves from the lower keyboard of the Citation. The 4' range is switched by the organ's 4' coupler. This signal is amplified by an ETI 3600 synth external input amplifier module, and can then be processed with various synth filters or modulators.
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The lower manual output is a mixture of 8' and 4' unfiltered square waves from the lower keyboard of the Citation. The 4' range is switched by the organ's 4' coupler. This signal is amplified by an [[ETI 3600 synthesizer]] external input amplifier module, and can then be processed with various synth filters or modulators.
   
 
The fast clock signal from the organ's rhythm unit is routed straight to the front panel, as well as being fed through a 4017 decade counter, so it can be adjusted as needed. The thumbwheel switch selects the division. The resultant signal is available from the "Divider Out" jack. The third rhythm related output is the downbeat signal, which has been AND gated from a couple of the internal rhythm unit signals. This signal is used to reset sequencers every two bars, so they stay in sync.
 
The fast clock signal from the organ's rhythm unit is routed straight to the front panel, as well as being fed through a 4017 decade counter, so it can be adjusted as needed. The thumbwheel switch selects the division. The resultant signal is available from the "Divider Out" jack. The third rhythm related output is the downbeat signal, which has been AND gated from a couple of the internal rhythm unit signals. This signal is used to reset sequencers every two bars, so they stay in sync.
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== External links ==
 
== External links ==
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* Ken Stone's notes about [https://web.archive.org/web/20030618014214f/http://www.cgs.synth.net/organ/index.html electronic organs]. (archived)
 
* [http://groups.yahoo.com/group/CGS_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
 
* [http://groups.yahoo.com/group/CGS_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
   

Revision as of 17:58, 31 May 2019

Cgs panel organ interface.jpg

The CGS organ interface was created to give Ken Stone a convenient way to interface an early 1970s Lowrey Citation Theatre Spinet to the synth. From top to bottom there are connections for:

  • Lower Manual output
  • Rhythm Unit
    • Clock Out
    • Divider Out
    • Down Beat
  • Amplifier inputs
    • Leslie
    • Main

The lower manual output is a mixture of 8' and 4' unfiltered square waves from the lower keyboard of the Citation. The 4' range is switched by the organ's 4' coupler. This signal is amplified by an ETI 3600 synthesizer external input amplifier module, and can then be processed with various synth filters or modulators.

The fast clock signal from the organ's rhythm unit is routed straight to the front panel, as well as being fed through a 4017 decade counter, so it can be adjusted as needed. The thumbwheel switch selects the division. The resultant signal is available from the "Divider Out" jack. The third rhythm related output is the downbeat signal, which has been AND gated from a couple of the internal rhythm unit signals. This signal is used to reset sequencers every two bars, so they stay in sync.

The signals from the amplifier inputs are mixed into the organ before the expression pedal, allowing control of all volumes with the expression pedal.

See also

References

External links