Making CD-Pro2

huangyong · 5th December 2004, 09:24 AM

hello.
need some help from u guys.
I am helping my friend to make a CD-Pro2 transport, he got his unit from daisy laser.
Now i need to decide on what power supply to use.
in the website, it recommend using a simple LM7805 / 7809 regulator will do. what you guys think, is it ok to use that to get very good sound?

anyway, i have this idea of adding a feedback to the regulator to make it perform better. Please give commend and advice.

tiefbassuebertr · 10th August 2009, 02:20 PM

This idea is very good in case, where extremly constant voltage is needed. In your case I would prefer extremly low noise and hum on the 5V rail. Therefore you need at first unit a normal regulator arround 12-15V and then a cascode current source, that loads a 5V power precision zener. You must choise the current so, that normal one half goes through the zener and the other half to cd player pcbs.
Do you still yet live in singapore?

5th December 2004, 09:24 AM	#1
huangyong diyAudio Member Join Date: Sep 2003 Location: Singapore	Making CD-Pro2 hello. need some help from u guys. I am helping my friend to make a CD-Pro2 transport, he got his unit from daisy laser. Now i need to decide on what power supply to use. in the website, it recommend using a simple LM7805 / 7809 regulator will do. what you guys think, is it ok to use that to get very good sound? anyway, i have this idea of adding a feedback to the regulator to make it perform better. Please give commend and advice.

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10th August 2009, 02:20 PM	#2
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	This idea is very good in case, where extremly constant voltage is needed. In your case I would prefer extremly low noise and hum on the 5V rail. Therefore you need at first unit a normal regulator arround 12-15V and then a cascode current source, that loads a 5V power precision zener. You must choise the current so, that normal one half goes through the zener and the other half to cd player pcbs. Do you still yet live in singapore?

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