preamp that always have same output if input is not always same

tonitonitoni · 18th December 2009, 10:36 PM

i have problems with jukebox in a cafe .. some songs are louder and some are quieter ... i m trying to build preamp that will have automatic control of output volume so that output will always be same(or close as possible)....i searched a lot and i cant find anything.
does anybody knows something please help
i apreciate your help..
sorry on bad english ...

Greg Erskine · 18th December 2009, 11:13 PM

tonitonitoni,

I can't see how you could to it automatically. How can you determine dynamically if a section of music is soft or that the whole song has been recorded at a low level. It will be interesting to find out if it is possible.

I think you need to fix the source material assuming it is digital and accessible. Some music servers have volume compensation but I don't think it is automatic.

regards

Geek · 19th December 2009, 01:17 AM

A simple compressor in line with the preamp output will fix that.

Lots of schematics on the net.

Cheers!

audiomachines · 19th December 2009, 03:07 AM

hello,

you could try a Symetrix 421 AGC Leveler. Hope this helps HAPPY HOLIDAYS to the DIYAudio clan

.

Best Regards,
audiomachines

18th December 2009, 10:36 PM	#1
tonitonitoni diyAudio Member Join Date: May 2008	preamp that always have same output if input is not always same i have problems with jukebox in a cafe .. some songs are louder and some are quieter ... i m trying to build preamp that will have automatic control of output volume so that output will always be same(or close as possible)....i searched a lot and i cant find anything. does anybody knows something please help i apreciate your help.. sorry on bad english ...

18th December 2009, 11:13 PM	#2
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	tonitonitoni, I can't see how you could to it automatically. How can you determine dynamically if a section of music is soft or that the whole song has been recorded at a low level. It will be interesting to find out if it is possible. I think you need to fix the source material assuming it is digital and accessible. Some music servers have volume compensation but I don't think it is automatic. regards __________________ Greg Erskine

19th December 2009, 03:07 AM	#4
audiomachines diyAudio Member Join Date: Dec 2005 Location: silang, cavite	hello, you could try a Symetrix 421 AGC Leveler. Hope this helps HAPPY HOLIDAYS to the DIYAudio clan. Best Regards, audiomachines

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19th December 2009, 01:17 AM	#3
Geek diyAudio Member Join Date: Sep 2004	A simple compressor in line with the preamp output will fix that. Lots of schematics on the net. Cheers!

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