unbalanced stereo out to mono summed balanced output

Original Burnedfingers · 11th January 2009, 02:08 PM

Waht would be the proper configuration to make a adapter to go from a 15K stereo output from a CD player to a summed 600 ohm balanced input to the next device in a chain?

I don't want to use a Y adapter.

AndrewT · 11th January 2009, 02:21 PM

inverting opamp with two summing resistors on the input.

Is the 600ohm connection really 600r?

Original Burnedfingers · 11th January 2009, 02:23 PM

Its really 600 ohm.

Didn't want to use an op amp. I was thinking a passive circuit using resistors.

djk · 11th January 2009, 05:45 PM

Hi Joe!

I would try a pair of 1K resistors, one on each of the 'hot' outputs of the RCA, into the 600R input 'hot'. The 'cold' of the 600R input I would return to the RCA common ground through a 560R.

Depending on how close to 600R input impedance actaually is, we will have a loss on the order of about 10dB.

The 1K resistors will prevent the CD player output stage from driving too hard on signals that are not common to both channels.

A transformer could be employed if full isolation is needed (ground loop), but it will have a very low output (mic level).

http://www.edcorusa.com/products/couplers/s2m-3.html

11th January 2009, 02:08 PM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	unbalanced stereo out to mono summed balanced output Waht would be the proper configuration to make a adapter to go from a 15K stereo output from a CD player to a summed 600 ohm balanced input to the next device in a chain? I don't want to use a Y adapter.

11th January 2009, 02:21 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	inverting opamp with two summing resistors on the input. Is the 600ohm connection really 600r? __________________ regards Andrew T.

11th January 2009, 05:45 PM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	Hi Joe! I would try a pair of 1K resistors, one on each of the 'hot' outputs of the RCA, into the 600R input 'hot'. The 'cold' of the 600R input I would return to the RCA common ground through a 560R. Depending on how close to 600R input impedance actaually is, we will have a loss on the order of about 10dB. The 1K resistors will prevent the CD player output stage from driving too hard on signals that are not common to both channels. A transformer could be employed if full isolation is needed (ground loop), but it will have a very low output (mic level). http://www.edcorusa.com/products/couplers/s2m-3.html __________________ Candidates for the Darwin Award should not read this author.

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11th January 2009, 02:23 PM	#3
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Its really 600 ohm. Didn't want to use an op amp. I was thinking a passive circuit using resistors.

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