LED VU meter after amp or preamp? - diyAudio
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Old 31st January 2008, 03:04 PM   #1
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Join Date: Feb 2007
Location: Argentina
Default LED VU meter after amp or preamp?

i recently built a led vumeter but, i have to connect it to the preamp or the amp?
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Old 31st January 2008, 03:15 PM   #2
hermanv is offline hermanv  United States
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Join Date: Apr 2004
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If you connect it to the pre-amp output it will show the level of any source selected by the pre-amp.

Please make sure the LED switching circuit can not feed noise back into the signal path. Also, watch out for new ground loops.
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Old 1st February 2008, 11:45 AM   #3
acid_k2 is offline acid_k2  Italy
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Hi hernanstafe,
you have to consider the sensitivity of the vumeter also.
Amplifiers output voltage is normally a lot higher than a preamp.
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Old 1st February 2008, 02:51 PM   #4
hermanv is offline hermanv  United States
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Quote:
Originally posted by acid_k2
Hi hernanstafe,
you have to consider the sensitivity of the vumeter also.
Amplifiers output voltage is normally a lot higher than a preamp.
You are absolutely correct, hernanstafe did not specify sensitivity. Those indicators powered by the speaker drive voltage are not very satisfactory in my experience.
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Old 7th February 2008, 05:23 AM   #5
dangus is offline dangus  Canada
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If you connect it to the input of the amp, you can calibrate it to read in watts, or dB below full output.
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