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Old 11th January 2009, 02:08 PM   #1
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Default 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.
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Old 11th January 2009, 02:21 PM   #2
AndrewT is offline AndrewT  Scotland
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inverting opamp with two summing resistors on the input.

Is the 600ohm connection really 600r?
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Old 11th January 2009, 02:23 PM   #3
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Its really 600 ohm.

Didn't want to use an op amp. I was thinking a passive circuit using resistors.
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Old 11th January 2009, 05:45 PM   #4
djk is offline djk
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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
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