meter on the DIY amplifier faceplate?

gychang · 10th October 2007, 09:47 PM

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.

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

gychang

gmphadte · 15th October 2007, 10:50 AM

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

Denis.BR · 15th October 2007, 03:21 PM

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.

Jan Dupont · 15th October 2007, 04:17 PM

It depends on the meters impedance...
Has it any writing on the back ?

gmphadte · 16th October 2007, 03:59 AM

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

Denis.BR · 16th October 2007, 09:34 AM

I see...and what does it mean?

I thought he wanted to measure the current used by the amp

gmphadte · 17th October 2007, 03:45 AM

He wants needles dancing with the music.

Gajanan Phadte

Denis.BR · 17th October 2007, 09:39 AM

no, I mean, what does the writings and symbols mean?

gmphadte · 18th October 2007, 05:22 AM

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

BL21DE3 · 18th October 2007, 07:18 AM

This article might be of some help with the VU meter circuit.

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

15th October 2007, 04:17 PM	#4
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	It depends on the meters impedance... Has it any writing on the back ? __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

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15th October 2007, 10:50 AM	#2
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	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

15th October 2007, 03:21 PM	#3
Denis.BR diyAudio Member Join Date: Mar 2007	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.

16th October 2007, 09:34 AM	#6
Denis.BR diyAudio Member Join Date: Mar 2007	I see...and what does it mean? I thought he wanted to measure the current used by the amp

17th October 2007, 03:45 AM	#7
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	He wants needles dancing with the music. Gajanan Phadte

17th October 2007, 09:39 AM	#8
Denis.BR diyAudio Member Join Date: Mar 2007	no, I mean, what does the writings and symbols mean?

18th October 2007, 05:22 AM	#9
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	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

18th October 2007, 07:18 AM	#10
BL21DE3 diyAudio Member Join Date: May 2004 Location: Saffron Walden	This article might be of some help with the VU meter circuit. http://www.jlmaudio.com/AT51%20DIY%20VU.pdf

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