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Old 13th May 2007, 02:13 PM   #1
cpemma is offline cpemma  United Kingdom
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Default "Vumeter" on BTL amp speaker

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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Old 13th May 2007, 02:20 PM   #2
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I think I still have that Elektor. If you wish, I can scan the schematic for you. It works on BTL amps.
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Old 13th May 2007, 03:39 PM   #3
cpemma is offline cpemma  United Kingdom
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Thanks, mailed you my address.
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