I have an application where I need to devise a method to add Three LED indicators to a speaker to determine the Gross amount of power being fed to the speaker. This is an industrial application where they use large PA speakers to literally shake devices.
The problem is that the amps are in one remote location and the control room is in another location. Access to the speakers is limited so the indicators must run purely from the speaker lines. the speakers are viewable by camera remote control.
I need to figure a way to light a Green LED's at 1 watt, and then some division of power there after. something like 200 or 250 watts triggers a yellow LED and then a Red LED at 500 watts which is the program rating of the speakers used. something like that.
But, whatever circuit is devised cant affect the audio signal being fed to the speaker.
I was thinking of a resistor and a Zener that would feed the LED and current limiting resistor. Just duplicate that 3 times with zeners/resistors calculated for the various power levels.
BUT, when the diodes conduct. wont that effect that audio signal? or would the effects be negligible???
Zc
The problem is that the amps are in one remote location and the control room is in another location. Access to the speakers is limited so the indicators must run purely from the speaker lines. the speakers are viewable by camera remote control.
I need to figure a way to light a Green LED's at 1 watt, and then some division of power there after. something like 200 or 250 watts triggers a yellow LED and then a Red LED at 500 watts which is the program rating of the speakers used. something like that.
But, whatever circuit is devised cant affect the audio signal being fed to the speaker.
I was thinking of a resistor and a Zener that would feed the LED and current limiting resistor. Just duplicate that 3 times with zeners/resistors calculated for the various power levels.
BUT, when the diodes conduct. wont that effect that audio signal? or would the effects be negligible???
Zc