HammondWiki - Diff: Adding 4th, 5th, and 6th Harmonic Percussion

Differences between version 4 and previous revision of Adding 4th, 5th, and 6th Harmonic Percussion.

Other diffs: Previous Major Revision, Previous Author

Newer page: version 4 Last edited on January 19, 2012 5:44 am. by
Older page: version 3 Last edited on January 15, 2012 2:20 pm. by
@@ -108,9 +108,9 @@
 <verbatim> 
 The schematic below shows three switches S4, S5 and S6 for harmonic selection. 
  
 S5 is shown in the ON state with the 5th harmonic selected. 
-S4 and S6 are shown in the off state. 
+S4 and S6 are shown in the OFF state. 
  
  |------|----------|-----------| 
  | | | | 
  | | | | 
@@ -122,19 +122,16 @@
  | DB6W DB6 DB7W DB7 DB8W DB8 
  | 4th Harm 5th Harm 6th Harm 
  | 
  | 
- | |-------------|  
- | | |  
- | | |  
- | . /. .\ .--| . /.-| 
- | S4-2/ \S5-2 S6-2/ | 
- |- --------. . . | 
- | | | | 
- | | | | 
- | |----------| | 
- | | 
- H HW 
+ | . /.-| .\ .--| . /.-| 
+ | S4-2/ \S5-2 | S6-2/ | 
+ |--------. | . | . | 
+ | | | | | | 
+ | | | | | 
+ | |------| | -----| | 
+ | | 
+ H HW 
  
 S4 4th harmonic DPDT On/Off switch; Mouser Part No. 633-M202201-RO 
 S5 5th harmonic DPDT On/Off switch; Mouser Part No. 633-M202201-RO 
 S6 6th harmonic DPDT On/Off switch; Mouser Part No. 633-M202201-RO 
@@ -143,10 +140,10 @@
 </verbatim> 
 <br> 
 __THEORY OF OPERATION__<br> 
  
-The “1” set of contacts on the S4, S5 and S6 selects the appropriate harmonic from the drawbar wire and routes it to the “H” (percussion input on AO-28) terminal. The “2” set of contacts are wired in series to isolate “HW” from terminal “H” anytime one switch is on . “HW” comes from the percussion switchbox for 2nd or 3rd harmonic input to the AO-28 when all three switches are off . 
+The “1” set of contacts on the S4, S5 and S6 selects the appropriate harmonic from the drawbar wire and routes it to the “H” (percussion input on AO-28) terminal. The “2” set of contacts are wired in series to isolate “HW” from terminal “H” anytime a harmonic is selected . “HW” comes from the percussion switchbox for 2nd or 3rd harmonic input to the AO-28 when none of the harmonics (4th, 5th or 6th) is selected . 
  
 An additional feature of the three switch configuration is that harmonics can be combined, i.e; 4&5, 4&6, 5&6 and 4&5&6. 
  
  
 !—JohnMihevic 

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