Question on Input Connections

dsavitsk · 22nd September 2007, 07:08 PM

I am finishing up a balanced preamp that uses a 1:1 input transformer. For inputs, I have some RCAs and an XLRs, and 4P3T switch.

The question is on the grounds of the RCAs. Should the grounds be switched like the negative pole of the XLR and kept separate, or should they all be connected together and connected (with the negative side of the transformer) to chassis ground, or some other variation? Suggestions?

Jan Dupont · 22nd September 2007, 07:30 PM

Normally on Single Ended Inputs (like RCA) the Ground is connected to Ground on the unit. The "hot" pin (signal pin) goes to the positive input of the unit. The negative input is connected to Ground.

KaDe · 22nd September 2007, 08:17 PM

unless there is a balanced source you want to connect one side of the primary goes to ground, so with RCAs

22nd September 2007, 07:08 PM	#1
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	Question on Input Connections I am finishing up a balanced preamp that uses a 1:1 input transformer. For inputs, I have some RCAs and an XLRs, and 4P3T switch. The question is on the grounds of the RCAs. Should the grounds be switched like the negative pole of the XLR and kept separate, or should they all be connected together and connected (with the negative side of the transformer) to chassis ground, or some other variation? Suggestions? __________________ http://www.ecpaudio.com

22nd September 2007, 07:30 PM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Normally on Single Ended Inputs (like RCA) the Ground is connected to Ground on the unit. The "hot" pin (signal pin) goes to the positive input of the unit. The negative input is connected to Ground. __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

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