Comparing

Bose(o) · 28th July 2005, 04:56 PM

How does one compare an AC voltage from an audio amplifier to a DC voltage. I'm currently trying to build a voltage limiter, but can't get the comparator to think that the AC input isn't "float."

I'm guessing that it is the difference between the grounds, but I'm unsure. Any input is greatly appreciated!

Leolabs · 29th July 2005, 02:51 AM

Schematic or block diagram??????

Bose(o) · 29th July 2005, 03:48 AM

This is the basics of what I want: AC exceeds the level of my DC voltage and the light turns on for the moment where the level is exceeded. Eventually I will sink the extra power to ground (haven't decided how yet), and the speaker will play the DC level voltage until the AC signal comes down in amplitude.

It's very archaic and wouldnt 'sound' that good when in protection mode, but I have to start somewhere so, sophistication will have to wait.

Thanks for the response!

analog_sa · 29th July 2005, 07:42 AM

Quote:

the speaker will play the DC level voltage

Now this will be a sight to behold.

Keld · 29th July 2005, 08:30 AM

Maybe this would help: http://sound.westhost.com/project23.htm

Bose(o) · 29th July 2005, 09:19 PM

I'm really trying to stay away from a split power supply and keeping around the simple area of a 12V DC system.

28th July 2005, 04:56 PM	#1
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Comparing How does one compare an AC voltage from an audio amplifier to a DC voltage. I'm currently trying to build a voltage limiter, but can't get the comparator to think that the AC input isn't "float." I'm guessing that it is the difference between the grounds, but I'm unsure. Any input is greatly appreciated! __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

29th July 2005, 09:19 PM	#6
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	I'm really trying to stay away from a split power supply and keeping around the simple area of a 12V DC system. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

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29th July 2005, 02:51 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Schematic or block diagram??????

29th July 2005, 08:30 AM	#5
Keld diyAudio Member Join Date: Jan 2002 Location: Borås, Sweden, Tellus	Maybe this would help: http://sound.westhost.com/project23.htm