DETAILED DESCRIPTION
Using a "relay logic" method and a 4-position rotary slider switch, this tester simply activates three LEDs in sequence for each switch position. Polarities are reversed for each switch position so that all three LEDs can correspond to a pair of three wires in the XLR cable. Because polarity is reversed at some point in the sequence of switch positions, I've also installed blocking diodes to prevent LED damage.
Note that the C&K Rota-Slide is not the most durable rotary switch avaible, and so the indicator lights can be intermittent.
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