Please Help with Stepped Attenuator Wiring

goody75 · 15th September 2012, 07:54 PM

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.

goody75 · 15th September 2012, 09:16 PM

FWIW, this is a DACT-type (series) attenuator that I bought on ebay.

goody75 · 15th September 2012, 09:33 PM

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).

15th September 2012, 07:54 PM	#1
goody75 diyAudio Member Join Date: Apr 2010 Location: Motown (area)	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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15th September 2012, 09:16 PM	#2
goody75 diyAudio Member Join Date: Apr 2010 Location: Motown (area)	FWIW, this is a DACT-type (series) attenuator that I bought on ebay.

15th September 2012, 09:33 PM	#3
goody75 diyAudio Member Join Date: Apr 2010 Location: Motown (area)	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).