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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Input Selection and Muting - Interested
Input Selection and Muting - Interested
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Old 13th January 2020, 07:39 PM   #1
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
Default Input Selection and Muting - Interested

I see posts where someone needs a way to do input selection and I thought I could take my design that included digital volume control and a remote and pair it down to a six input fully balance/single ended and a muting circuit controlled by two buttons on the front panel of the preamp. it would consist of two boards, a display with seven segment LED to show the input and mute status and the two buttons, size of 2.5"x2.5", and the input board with the relays and a voltage regulator 4"x4", input for 8-12vdc or 5vdc and not need the regulator. Also a little power supply board if you didn't have the above voltage already present in the preamp. The PS would measure 2.5"x3". Cost about $65 USD with PS, minus $15 USD without.
Anyone interested. I can post schematics and BOM, and Gerbers.

Last edited by johnhenryharris; 22nd January 2020 at 06:46 AM.
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Old 13th January 2020, 09:22 PM   #2
seyl3r is offline seyl3r
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Hi johnhenryharris,

That sounds great! Can you share pictures of your boards or the whole assembly? Schematics, BOM and gerber files are great as well, but the pictures help best to get a first idea of how it looks like I think.

Thanks
seyl3r
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Old 16th January 2020, 05:35 AM   #3
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
If you look at the full blown boards which have the volume control and remote it would be the right half of the display board and the back half of the main board see
Preamp Control - Volume, input, mute, remote
posts #1, 143 and 144 for the pics.
I will post the schematics and board layout with gerbers and the BOM for this next board, tomorrow or the next day if work isn't too heavy.
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Old 21st January 2020, 02:58 PM   #4
Paulski is offline Paulski  United Kingdom
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I'm very interested in seeing the schematics / Gerbers for this when you get the chance. Sounds like it could be just what I'm after.
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Old 21st January 2020, 05:05 PM   #5
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
ok so here are the schematics and front and back of the board layouts. This is for 6 inputs fully balanced, although you can populate only half of the selection relays for single ended.


Will double check the BOM and then turn gerbers and attach.
Attached Files
File Type: pdf Input Select and Mute.pdf (560.7 KB, 28 views)
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Old 21st January 2020, 08:31 PM   #6
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
Man it takes a while to check the accuracy of the BOM, get part numbers for Mouser and Digikey and plug in the cost, I like to know up front what a project will cost. So here is the BOM spreadsheet, zipped.
Attached Files
File Type: zip Digital-Input-Mute-Control.zip (19.3 KB, 6 views)
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Old 21st January 2020, 09:06 PM   #7
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
Well it didn't take long to find an error. I try to pay close attention to the analog signal traces and now I found I had the output on the left channel with the polarity inverted, which will not do, so I have corrected the Schematic and the board layout. Here you go.
Attached Files
File Type: pdf Schematic-Input-Mute.pdf (302.4 KB, 19 views)

Last edited by johnhenryharris; 21st January 2020 at 09:20 PM.
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Old 22nd January 2020, 06:26 PM   #8
johnhenryharris is offline johnhenryharris  United States
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Join Date: Nov 2012
Location: San Diego, CA
And here are the gerbers for the Main, Display and Power Supply boards.
Attached Files
File Type: zip MainBoardV1.zip (16.8 KB, 1 views)
File Type: zip DisplayV1.zip (8.9 KB, 0 views)
File Type: zip PowerSupplyV1.zip (3.8 KB, 0 views)
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