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Old 10th October 2007, 09:47 PM   #1
gychang is offline gychang  United States
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Default meter on the DIY amplifier faceplate?

I saw some neat meters that can be put on the amplifier faceplate.

Can something like this be done on my amp?, how does it hook up? from the speaker output? I am a novice with amp32 pictured here.

Click the image to open in full size.

I recall even seeing a amplifier case with auto amp meter on it...

gychang
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Old 15th October 2007, 10:50 AM   #2
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Basically, these meters are µAmp-meters or milli Amp-meters.

the auto amp-meter u have seen is basically the same but the current measument is done using a small value shunt R.

U cannot use these meters directly in an amp. They will need the additional drive circuitry.

Google for VU meter and then search within results for analog.

Some drive circuits will be available on the datasheet of LM3915, but u will need some basic understanding to use them for the analog meter.

Gajanan Phadte
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Old 15th October 2007, 03:21 PM   #3
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I know you can use this amp meter using an resistor in parallel with it, but can't precise how many ohms do you need.
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Old 15th October 2007, 04:17 PM   #4
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It depends on the meters impedance...
Has it any writing on the back ?
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Old 16th October 2007, 03:59 AM   #5
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Quote:
I know you can use this amp meter using an resistor in parallel with it, but can't precise how many ohms do you need.
No, not for vu meter purposes. This is the method of indicating high current.
If u look closely on the meter dial, there will be some writings and symbols, which indicates movement type and parameters.

Gajanan Phadte
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Old 16th October 2007, 09:34 AM   #6
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I see...and what does it mean?

I thought he wanted to measure the current used by the amp
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Old 17th October 2007, 03:45 AM   #7
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He wants needles dancing with the music.

Gajanan Phadte
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Old 17th October 2007, 09:39 AM   #8
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no, I mean, what does the writings and symbols mean?
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Old 18th October 2007, 05:22 AM   #9
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The type of meter
-moving coil
-moving vane
and the sub-categories

the current rating
the shielding, if any
the protection, if any

Gajanan Phadte
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Old 18th October 2007, 07:18 AM   #10
BL21DE3 is offline BL21DE3  Scotland
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This article might be of some help with the VU meter circuit.

http://www.jlmaudio.com/AT51%20DIY%20VU.pdf
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