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Old 16th July 2013, 02:51 PM   #21
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That should have said 6th. order (not pole) Butterworth filter (36 dB response roll-off/octave), better an 8th. order filter with a 64 dB slope. E
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Old 16th July 2013, 03:32 PM   #22
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Quote:
Originally Posted by mickeymoose View Post
Here is some info on a 2x15 and a 1x40 VU meter using an inexpensive PIC16F88. Add proper filters in front (for 1/3 octave you will need a 6-pole Butterworth for each band): www.s-o.webnode.cz/vu-meter/ E
Thank you sir.
But unfortunately the link is not working.
I got this error with the photo of the LED VU meter build. Could you kindly re-check that?
"
Sorry, the requested page to the server could not be found
. Probably been canceled or you have incorrectly entered the address."




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Old 16th July 2013, 05:46 PM   #23
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Sorry, found the link. Thank you.
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Old 20th July 2013, 07:31 PM   #24
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Quote:
Originally Posted by olafk View Post
Ok, here we are.
If you need the files mirrored, i can print it new.

regards Olaf
Dear Olaf,
Kindly post the mirrored files.
Also, could you kindly post the top component layers in PDF too ?

Thank you so much.
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Old 28th July 2013, 12:02 PM   #25
olafk is offline olafk  Germany
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Hi Som,

sorry, was on vacation. Will later look for your files.

regards Olaf
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Old 28th July 2013, 08:37 PM   #26
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Originally Posted by olafk View Post
Hi Som,

sorry, was on vacation. Will later look for your files.

regards Olaf
Oh great! I hope you had a great time there. So welcome back again.
And please take your time.


Quote:
Originally Posted by csom View Post
I found a nice display section with more LEDs on youtube
10 band audio spectrum analyzer with 400 LED FullHD - YouTube
This section uses LM324 opamps.

The poster posted a documentation link there too.
YouTube

I want to use this display section along with your filter section.
It would be great if you could confirm it will work or not.
Thank you.
When you have time of course.
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Old 29th July 2013, 07:44 PM   #27
olafk is offline olafk  Germany
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Hi Som

I've looked at the links and I am not a expert (thats why i built a tested solution ;-). I can not see the video in Germany, unfortunately.
I'm not sure why you do not want to use the original filter circuit for this display solution. There seems to be a simple filter circuit. If you want more frequencies, you can add filters.

By the other way you have to create a new pcb because you do not need the LM3915. I do not know how the voltage-levels are, but you can use a simple buffer for this.

Another difference is that your display is linear. the LM3915 is logarithmic.

regards Olaf
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Old 29th July 2013, 07:59 PM   #28
olafk is offline olafk  Germany
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However, here are the files.

regards Olaf
Attached Files
File Type: pdf Layout_Filter_Mirror.pdf (22.3 KB, 28 views)
File Type: pdf Layout_Preamplifier_Mirror.pdf (42.8 KB, 24 views)
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Old 30th July 2013, 10:08 AM   #29
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Quote:
Originally Posted by olafk View Post
Hi Som

I've looked at the links and I am not a expert (thats why i built a tested solution ;-).
Thank you Olaf Now you are an expert after building this.

Quote:
Originally Posted by olafk View Post
I can not see the video in Germany, unfortunately.
I'm not sure why you do not want to use the original filter circuit for this display solution. There seems to be a simple filter circuit. If you want more frequencies, you can add filters.

By the other way you have to create a new pcb because you do not need the LM3915. I do not know how the voltage-levels are, but you can use a simple buffer for this.

Another difference is that your display is linear. the LM3915 is logarithmic.

regards Olaf
That's so unfortunate. It has a much bigger display. Some 80 Leds per channel I guess. The man has made a 10 channel display too. 10 channel is more than enough imho.

The man has provided PCB layouts in Eagle format. I opened that and was able to print the pdf. But It has some errors. So I am hesitant to follow his layout. I sent a message to the man but have not got any reply from him so far.

My plan was to use your filter and buffer board along with the display of that man for his displays are bigger ( obviously at the cost of more power, some 7.5 amp )

I will attempt to build a single VU meter display following the circuit of that man and report back to you about my success or failure.

If I fail I will just use your design completely.


Quote:
Originally Posted by olafk View Post
However, here are the files.

regards Olaf
Thank you so much olaf. I will start making them now. And ask more if I get stuck.
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Old 30th July 2013, 12:46 PM   #30
olafk is offline olafk  Germany
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Yes, i have seen the eagle-files (only video does not run in germany because rights of the music). But you may use it as template.
Ok, so good luck for the prototype. I'm very curious.

regards
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