current flow indication through induction

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shahbaz.ele

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dear all I want to have an indication of circuit connected via LED or some other method.
actually I have ten different Audio amlifier machines running ten different circuits of speakers.
I want to make a monitoring panel for it.
Machines output is 100V at 42 ohm.
TOA machine
I am thinking about induction because i does not want to add extra load on machine.
 

why you do't use digital voltmeter for this purpose.
It will not effect your load i think.
 
Thanks dear kamranravian
this is a good option to use digital voltmeters.
is there any other suggestion please.
 

LEDs use very little current. This circuit is simple, cheap, and puts almost no load on the amplifier.



edit: Analog meters would be better than digital ones. With digital meters, the numbers will be constantly changing and difficult to read.
 

1. what is purpose of diode.
2. if I want to monitor/judge level of sound by indicating led bar
 

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