Please Help with Stepped Attenuator Wiring - diyAudio
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Old 15th September 2012, 07:54 PM   #1
goody75 is offline goody75  United States
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Join Date: Apr 2010
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Default Please Help with Stepped Attenuator Wiring

As soon as took my stepped attenuator out of the packaging, I realized that the terminals are not labeled and I don't have any instructions. I took some measurements and I think I figured out what the terminals are but could someone please verify it? Here are the measurements I took with the volume all the way down (CCW) and all the way up (CW). It's a 20K ohm pot. [Volume at 0: pin1-pin2 = 0, pin1-pin3 = 20K, pin2-pin3 = 20K]. [Volume at Max: pin1-pin2 = 20K, pin1-pin3 = 20K, pin2-pin3 = 0]. With the volume at 0, we want all of the input signal to be shunted to ground (pin1-pin2=0). With the volume at max, we want all of the input signal going to the output (pin2-pin3=0). So I think pin1=ground, pin2=input and pin3=output. For some reason the website removed my paragraph spacing so I apologize this post isn't more readable.
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Old 15th September 2012, 09:16 PM   #2
goody75 is offline goody75  United States
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FWIW, this is a DACT-type (series) attenuator that I bought on ebay.
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Old 15th September 2012, 09:33 PM   #3
goody75 is offline goody75  United States
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I think I had the input & output pins reversed. Now I think pin1=ground, pin2=output & pin3=input. The impedance between input & ground should be constant (20Kohm).
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