Need help with power supply, ~12v source: 9v, 5v, and 3.3v ouputs

mbcouple · 30th August 2005, 09:45 PM

I am trying to build a power supply to power some pro-audio gear in the car. I will probably use one of the many modified jung regulators for the 5v and the 9v, but what should i use for the 3.3v? There is quite a bit of ripple and noise comming from the alternator, so i will need a good pre-regulator. Should i just use one of the lm3940's i have lying around and feed it with the output of the 5v "jung" regulator? Any suggestions on any of the supplies would be useful. So to sum it up, i have the fluctuating car power to deal with say from 12v-15v and from there i need +9v, +5v, and +3.3v.
Thanks
Hans

Eva · 31st August 2005, 09:07 PM

I may have what you want.

Check this post : http://www.diyaudio.com/forums/showt...494#post698494

mbcouple · 2nd September 2005, 05:07 PM

How do i contact you

Eva · 2nd September 2005, 06:19 PM

Mail me at "evita|eslamejor|com"

Replace the first "|" by "@" and the second "|" by "." (just to avoid automatic email collectors).

30th August 2005, 09:45 PM	#1
mbcouple diyAudio Member Join Date: May 2004 Location: Indy	Need help with power supply, ~12v source: 9v, 5v, and 3.3v ouputs I am trying to build a power supply to power some pro-audio gear in the car. I will probably use one of the many modified jung regulators for the 5v and the 9v, but what should i use for the 3.3v? There is quite a bit of ripple and noise comming from the alternator, so i will need a good pre-regulator. Should i just use one of the lm3940's i have lying around and feed it with the output of the 5v "jung" regulator? Any suggestions on any of the supplies would be useful. So to sum it up, i have the fluctuating car power to deal with say from 12v-15v and from there i need +9v, +5v, and +3.3v. Thanks Hans

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31st August 2005, 09:07 PM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	I may have what you want. Check this post : http://www.diyaudio.com/forums/showt...494#post698494

2nd September 2005, 05:07 PM	#3
mbcouple diyAudio Member Join Date: May 2004 Location: Indy	How do i contact you

2nd September 2005, 06:19 PM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Mail me at "evita\|eslamejor\|com" Replace the first "\|" by "@" and the second "\|" by "." (just to avoid automatic email collectors).