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[[File:cgs_photo_cgs122_matrix4.jpg|thumb|center|900px|Switch PCB. Note that only half of the resistor positions are used. 1/8 W resistors are required. The second resistor position is for a second matrix on the same board, allowing for stereo switching. The CGS123 interface board is only mono.]]
[[File:cgs_photo_cgs122_matrix.jpg|thumb|center|900px|Rear of switch PCB.]]
== CC-BY-NC ==
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
== See also ==
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