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Help with VU meter amplification made of an Ampere Meter
Help with VU meter amplification made of an Ampere Meter
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Old 9th July 2016, 06:37 PM   #1
oszkar is offline oszkar  Romania
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Join Date: Feb 2013
Location: Baia Mare
Default Help with VU meter amplification made of an Ampere Meter

Help with VU meter amplification made of an Ampere Meter:

Hello!

I have got hold of 3 measuring instrument displays 10 x 8cm big!

1st had the torsion wire broken
2nd works fine with a 200k pot and a diode
3rd one is an ampere meter display but the signal is too low all the time. On the speaker line it work well. 100k pot, diode in the contraption.

I will post some pics later.I intend to use them both with pots on the rec out line of the amplifier so that they can be a friend talk subject every time they visit.

I am adjusting them from the pots based on Peak Search CD on the highest signal recorded of the Cd that I have in the house with a quarter of its range left out of the beat of it so that it has a safety margin for every time I play back sound with them being in the scene.
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Old 9th July 2016, 08:27 PM   #2
simon7000 is offline simon7000  United States
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Look inside the meter there should be a shunt resistor. Just clip it out. It should be right across the input terminals.

Last edited by simon7000; 9th July 2016 at 08:30 PM.
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Old 10th July 2016, 06:35 PM   #3
oszkar is offline oszkar  Romania
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Here are pics of the meter did not find the res.
Attached Images
File Type: jpg IMG_20160710_212839.jpg (476.5 KB, 204 views)
File Type: jpg IMG_20160710_212913.jpg (496.6 KB, 192 views)
File Type: jpg IMG_20160710_212925.jpg (545.6 KB, 184 views)
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Old 10th July 2016, 06:55 PM   #4
thimios is offline thimios  Greece
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Resistor is inside the am-meter.
You should disassemble the organ to find this.
It isn't a simple way.
Attached Images
File Type: jpg IMG_20160710_212913.jpg (498.2 KB, 175 views)
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Old 11th July 2016, 01:38 PM   #5
oszkar is offline oszkar  Romania
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Will try! Dough can't i decrease the value of the resistor with another resistor or cancel it out?
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Old 11th July 2016, 01:43 PM   #6
thimios is offline thimios  Greece
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Quote:
Originally Posted by oszkar View Post
Will try! Dough can't i decrease the value of the resistor with another resistor or cancel it out?
If you decrease the resistor this make the Ammeter suitable for bigger currents.
You must remove this,then the Ameter is probably suitable for 1mA OR 10mA or so...
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Old 11th July 2016, 02:21 PM   #7
oszkar is offline oszkar  Romania
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here are pics from inside...
Attached Images
File Type: jpg P1100762.jpg (467.7 KB, 148 views)
File Type: jpg P1100763.jpg (456.4 KB, 63 views)
File Type: jpg P1100764.jpg (429.3 KB, 52 views)
File Type: jpg P1100765.jpg (439.8 KB, 45 views)
File Type: jpg P1100766.jpg (462.6 KB, 47 views)
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Old 11th July 2016, 02:54 PM   #8
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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What reading do you get with a 9v battery and a 1k resistor in series?
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Old 11th July 2016, 03:32 PM   #9
oszkar is offline oszkar  Romania
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I don't have a 1k res at hand, only a 9v battery. The Shunt resistor is the metal flange, no?
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Old 11th July 2016, 06:45 PM   #10
simon7000 is offline simon7000  United States
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In the first picture I can see the top and bottom of the moving coil. One wire goes from the top of it to an input terminal. There also is a wire from the bottom of the coil to the other terminal. Nothing else should be connected. I see what looks like a small coil that may be in the circuit and what may be a terminal board that ties the coil in. But not quite enough views to be sure of the wiring. So removing one wire from the terminal board connecting to the small coil should do it.
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