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Old 14th January 2008, 07:46 AM   #71
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Hi Sklimek,

It's very wonderful thing but if it had passed your test will be fantastic.

Can you share the PCB layout with me ?

Or, if you have a more, how about sell one for me.

I have a pair of lager meter from Japan , not sure who have interest ?

CK
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Old 14th January 2008, 02:13 PM   #72
sklimek is offline sklimek  United States
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Hi CK, I did a quick hook up to the output of a of a CD player and and watched very small meter movement, the output was only .5 volt though. I need to wire it up correctly to see if it works correctly, I also need to figure out what my meters are and how to calibrate it as well. I'll try to get to it this later this week.

I made the circuit w/ Eagle, here is a revised .sch and board layout, keep us posted, thanks - Stan
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File Type: jpg vu-ver2a.jpg (81.7 KB, 571 views)
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Old 14th January 2008, 02:37 PM   #73
sklimek is offline sklimek  United States
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Screenshot of the schematic, let me know if you can use the eagle files.

Stan
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File Type: jpg vu-2c-schem.jpg (80.4 KB, 552 views)
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Old 14th January 2008, 02:47 PM   #74
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The passage claimed the first stage gain factors is 6. In general speaking CD player can deliver 0.5-1v rms output for this circuit. So that it can be operated in a larger scale.

http://www.edn.com/contents/images/6280030.pdf

From the passage said IC2 which monitors the difference between the incoming signal's amplitude and the peak-detected output. What is the meaning to this statement ? What the function of the IC2 ?

If you can find what the problem of your case, please update to me. Later, I will try to make one of this prototype.

SCH & PCB I am using Protel SE 99 , it really a good thing but eagle i can try. Can you post the PCB brd layout file here ?
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Old 14th January 2008, 03:13 PM   #75
sklimek is offline sklimek  United States
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Quote:
Originally posted by ckwong99
The passage claimed the first stage gain factors is 6. In general speaking CD player can deliver 0.5-1v rms output for this circuit. So that it can be operated in a larger scale.

http://www.edn.com/contents/images/6280030.pdf

From the passage said IC2 which monitors the difference between the incoming signal's amplitude and the peak-detected output. What is the meaning to this statement ? What the function of the IC2 ?

If you can find what the problem of your case, please update to me. Later, I will try to make one of this prototype.

SCH & PCB I am using Protel SE 99 , it really a good thing but eagle i can try. Can you post the PCB brd layout file here ?
Here's the Eagle .brd file.
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File Type: zip vu3ver2a.zip (7.3 KB, 85 views)
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Old 18th January 2008, 01:59 PM   #76
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I am interested in your VU meter board also.
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Old 22nd October 2011, 07:04 PM   #77
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Hi. Do you have a BOM that goes with the PCB design? Thanks...
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Old 22nd October 2011, 08:26 PM   #78
sklimek is offline sklimek  United States
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Quote:
Originally Posted by Algar_emi View Post
Hi. Do you have a BOM that goes with the PCB design? Thanks...


Hi Sylvain, if you are referring to me instead of jackinnj sure I will post the BOM and latest .brd/.sch file when I get back home in about a week.
I recently reworked the board and had the same problem of no gain at the outputs. It would be great to have your eyes and brain on this to see where my problem is if you are interested.

Best - Stan
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Old 25th October 2011, 01:26 AM   #79
sklimek is offline sklimek  United States
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OK, here is the latest version of the board. I attached the BOM, Eagle files and pics of the board.
This schematic was created from the original EDN article Volume-Unit meter spans 60-dB dynamic range scroll down.
As mentioned before I had gain problems on output.
Hope this helps…
Attached Images
File Type: gif schematic.gif (66.6 KB, 242 views)
File Type: gif traces.gif (111.8 KB, 232 views)
File Type: gif full board.gif (121.3 KB, 221 views)
File Type: gif components.gif (91.5 KB, 108 views)
Attached Files
File Type: zip vu_bom.zip (9.6 KB, 53 views)
File Type: zip Eagle.zip (66.5 KB, 44 views)
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Old 25th October 2011, 04:41 AM   #80
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I'll jump on 2 sets of boards when they are ready.
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