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"Vumeter" on BTL amp speaker

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cpemma

Member
Joined 2003
cpemma.co.uk
Vumeter in quotes as it's intended to go across the speaker leads rather than line level, but a BTL amp on 12V car supply. Using an LM391x circuit, could this be done with a cap (1uF?) in each lead from the speaker terminals to avoid connecting one directly to the meter's (and ampliofier's) power ground? Or is there a better method, that likewise doesn't involve opening up the amplifier?

There was one in Elektor back in July/Aug 2003 if anyone hoards copies.
 
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