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Tue VU meters are 100% passive devices that are designed to sit directly across a balanced output that is capable of driving a 600 ohm load. The VU itself is not a 600 ohm load but if the signal source is not capable of driving a 600 ohm load then the VU will add unnecessary distortion to the signal.


A classic VU meter is nothing more than a series resistor (about 2400 ohms) nd a germanium bridge rectifier connected directly to a meter movement. with defined ballistics.


Cheers


Ian


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