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Author Topic: Guide: Stereo VU Meter  (Read 29903 times)

djpenguin

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Guide: Stereo VU Meter
« Reply #10 on: August 03, 2003, 01:21:55 AM »

jingoku, do you think you could toss up a schematic for wiring 3 of them together to get the 90dB range?  I'm thinking about putting 8 of those on a panel to monitor input/output signal (going to wire in a DPDT to switch between input and output) when I get my new computer and it's Delta 1010 (whenever I get the money saved up.... :roll: )

<edit>  How much does each one of these cost?  (excluding shipping)
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LordZuul01

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Guide: Stereo VU Meter
« Reply #11 on: August 03, 2003, 06:08:11 AM »

I was just wondering why you didn't use the bar graph style LEDs. The kind that are already built into arays...
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Skylined

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Guide: Stereo VU Meter
« Reply #12 on: August 03, 2003, 12:15:38 PM »

LordZuul01: because a bar graph has only one colour, you cannot do the green - yellow - red
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TheM@trix

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Guide: Stereo VU Meter
« Reply #13 on: August 03, 2003, 03:51:02 PM »

What was that horrible noise in the background? LOL. Kiddin Gid. I think you should have stuck with one color though.
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LordZuul01

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Guide: Stereo VU Meter
« Reply #14 on: August 04, 2003, 02:31:07 AM »

Sorry ... i thought that you meant this one...



:)
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jingoku

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Guide: Stereo VU Meter
« Reply #15 on: August 04, 2003, 04:50:29 AM »

sorry for the delay in replies. I dont have internet at home, and I'm on vacation...so I dont get much computer access.

Ok, let me answer a few questions in order:

1) Black_Ops is correct about adding a pot between the signal in and the IC.

2) The resistors aren't needed as long as the LEDs fall between 3V and the Input Voltage. (in my case is 12 Volts) plus on my final setup I used 3mm too, so you are fine without resistors.

3) I'm going to get to work and draw schematics for 3 of them today, and also for stereo.

4) I didn't want to use one color because I wanted to make use of my colorful set of LEDs...  :D  and I didn't use bar mode because on my final setup I had the LEDs at the bottom of the case and it looked nicer to have them separate. I'll try and post pics once I get back to the US.
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LordZuul01

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Guide: Stereo VU Meter
« Reply #16 on: August 04, 2003, 06:34:47 AM »

Just for a quick reference, here is the data sheets from National Semiconductor for the LM3916N

:: PDF ::
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renderblender

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Guide: Stereo VU Meter
« Reply #17 on: August 04, 2003, 10:55:58 AM »

I you have a corporate email account, you can get free sample from www.national.com. :)
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I LOVE ED

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Guide: Stereo VU Meter
« Reply #18 on: August 04, 2003, 11:53:42 AM »

Quote from: Skylined
LordZuul01: because a bar graph has only one colour, you cannot do the green - yellow - red


there are multi-colored LED bar graphs.  mouser has a lot of combinations like RGRGRGRGRG, GGGGGGRRRR, GGGGYYYYRR, etc.

Quote from: Skylined
In mono you just have Ground and 1 Signal, while in stereo you have Ground and 2 Signals.

Mono


Stereo


Do you have a diagram showing the wire end of the plugs?  showing where each line is gonna be wired?
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Skylined

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Guide: Stereo VU Meter
« Reply #19 on: August 04, 2003, 12:59:46 PM »

1. I didn't know multi colour bar graphs exist, as always happens they don't sell them here  :x
2. I don't have how to wire it at the other end of the plug, all I can say is test continuity or try with a led.
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