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Old 17th February 2004, 06:46 AM   #1
diyAudio Member
 
Join Date: Feb 2004
Location: Hawaii
Default How to install a cd phase switch

Hi
I read some old message that teach how to install a phase switch for cd player.
It talk about the INV pin on the dac,what is the inv pin stand for and how to find the 0v and 5v.
Jimmy
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Old 17th February 2004, 01:50 PM   #2
Klaus is offline Klaus  Germany
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Join Date: May 2002
Location: near Frankfurt/Main
Hi Jim,

INV pin means the switched pin to activate the inverted phase mode of the DAC. At some older DAC ICs this was realized to use this DACs in full symmetrical applications. Check the datasheet of your DAC if this pin is available and how to switch. 0V and 5V would be like ground and V_supply but check datasheet.

Most newer DACs have no more INV mode, therefore they frequently have symmetrical outputs. Here one Inv-relay can solve the issue. I realized one INV-relay at my Aleph P1.7 preamp, so each signal source can be inverted.

Regards

Klaus
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Old 18th February 2004, 07:19 AM   #3
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Join Date: Feb 2004
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Default cd phase switch again

Hi Klaus,
Thanks for the reply,is it ok to draw out a full circuit how to use a relay to made a phase switch.
Thanks
jimmy
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Old 18th February 2004, 12:30 PM   #4
Klaus is offline Klaus  Germany
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Join Date: May 2002
Location: near Frankfurt/Main
Default relay inverter

Hi Jim,

Use a relay with two times change-contact, if you know what I mean. Connect it like shown.

I placed my inv-relay right in front of the input coupling cap of my Aleph P1.7 preamp. It works perfect!

Regards

Klaus
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