"Vumeter" on BTL amp speaker

cpemma · 13th May 2007, 02:13 PM

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.

Simpleton · 13th May 2007, 02:20 PM

I think I still have that Elektor. If you wish, I can scan the schematic for you. It works on BTL amps.

cpemma · 13th May 2007, 03:39 PM

Thanks, mailed you my address.

13th May 2007, 02:13 PM	#1
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	"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.

13th May 2007, 02:20 PM	#2
Simpleton diyAudio Member Join Date: Jan 2005 Location: Lisboa	I think I still have that Elektor. If you wish, I can scan the schematic for you. It works on BTL amps. __________________ "There's something organic about a happy cloud of electrons" - Neutron Bob

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13th May 2007, 03:39 PM	#3
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	Thanks, mailed you my address.

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