current flow indication through induction

[shahbaz.ele]

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.

 

[kamranravian]

why you do't use digital voltmeter for this purpose.
It will not effect your load i think.

 

[shahbaz.ele]

Thanks dear kamranravian
this is a good option to use digital voltmeters.
is there any other suggestion please.

 

[godfreyl]

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.

 

[shahbaz.ele]

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