"MS Mini" Basic Mid Side Board

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mediatechnology
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"MS Mini" Basic Mid Side Board

Post by mediatechnology » Wed Aug 25, 2021 7:48 pm

"MS Mini" Basic Mid Side Board

Update September 9, 2021. The construction thread is located here: The construction thread for the Mid Side Mini is located here: viewtopic.php?f=7&t=1272

I've had a basic MS board on my list to replace the original I did over a dozen years ago.

The "MS Mini" incorporates the Mid Side gain offset capability of the MSII.
Using jumpers, Mid Encode level can be attenuated 6 dB [(L+R)/2] and an offset gain of +6 dB applied on decode to maintain MS ratio.
Using a jumper and an IC change (IC6 1240 or 1246) Side Encode level can be boosted 6 dB with a decode offset of -6dB.

Gain offsets in the Mid, Side or both Insert Sends present more-balanced levels to outboard gear.
Side is particularly level-challenged often being 10-20 dB below Mid.

The MS-Mini's decoder, identical to the MSII also prevents M+S and M-S from producing 2L and 2R.
This avoids having to incorporate a -6dB stage to maintain unity gain.

Image
MS-Mini PC Layout

The board is about 3.7" by 2.75".

I'll be ordering them in the next day or so and should have a small run in about 10 days.
https://ka-electronics.com

Directing Orson Welles: "What Is It That You Want?": https://waynekirkwood.com/content/Orson ... u_Want.mp3

Americas Frontline Doctors Lawsuit Motion For Preliminary Injunction Of Covid-19 Vaccine Emergency Use Authorization: https://waynekirkwood.com/images/pdf/Am ... zation.pdf
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mediatechnology
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Re: "MS Mini" Basic Mid Side Board

Post by mediatechnology » Sun Aug 29, 2021 3:05 pm

This is the schematic for the "Mid Side MIni."

Image
Mid Side MIni Compact MS Encoder/Decoder
https://ka-electronics.com

Directing Orson Welles: "What Is It That You Want?": https://waynekirkwood.com/content/Orson ... u_Want.mp3

Americas Frontline Doctors Lawsuit Motion For Preliminary Injunction Of Covid-19 Vaccine Emergency Use Authorization: https://waynekirkwood.com/images/pdf/Am ... zation.pdf
Americas Frontline Doctors Lawsuit Whistle Blower Declaration: https://waynekirkwood.com/images/pdf/Am ... ration.pdf

emrr
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Re: "MS Mini" Basic Mid Side Board

Post by emrr » Wed Sep 08, 2021 7:42 am

Nice
Best,

Doug Williams
Electromagnetic Radiation Recorders

Gold
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Re: "MS Mini" Basic Mid Side Board

Post by Gold » Wed Sep 08, 2021 1:25 pm

I still have a pile of the V1 PCB's that I get good use out of. This is a nice addition to the line.

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mediatechnology
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Re: "MS Mini" Basic Mid Side Board

Post by mediatechnology » Wed Sep 08, 2021 3:41 pm

Thanks guys!
I'm expecting a small run of boards to arrive in the next hour or so.
https://ka-electronics.com

Directing Orson Welles: "What Is It That You Want?": https://waynekirkwood.com/content/Orson ... u_Want.mp3

Americas Frontline Doctors Lawsuit Motion For Preliminary Injunction Of Covid-19 Vaccine Emergency Use Authorization: https://waynekirkwood.com/images/pdf/Am ... zation.pdf
Americas Frontline Doctors Lawsuit Whistle Blower Declaration: https://waynekirkwood.com/images/pdf/Am ... ration.pdf

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mediatechnology
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Re: "MS Mini" Basic Mid Side Board

Post by mediatechnology » Wed Sep 08, 2021 4:24 pm

Just in...

Let's see if it runs.

Image
Mid Side Mini PC Board
https://ka-electronics.com

Directing Orson Welles: "What Is It That You Want?": https://waynekirkwood.com/content/Orson ... u_Want.mp3

Americas Frontline Doctors Lawsuit Motion For Preliminary Injunction Of Covid-19 Vaccine Emergency Use Authorization: https://waynekirkwood.com/images/pdf/Am ... zation.pdf
Americas Frontline Doctors Lawsuit Whistle Blower Declaration: https://waynekirkwood.com/images/pdf/Am ... ration.pdf

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mediatechnology
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Re: "MS Mini" Basic Mid Side Board

Post by mediatechnology » Wed Sep 08, 2021 8:19 pm

Works great!

The construction thread for the Mid Side Mini is located here: viewtopic.php?f=7&t=1272

Image
MS Mini PCB Assembled

Left > Right Crosstalk Full Encode/Decode

Image
MS Mini Crosstalk L Into R

The full encode/decode 20 kHz unweighted noise level is about -96 dBu.
The dynamic range is 123 dB with +/-15V supplies.

Image
MS Mini Noise Level 20kHz BW Full Encode Decode
https://ka-electronics.com

Directing Orson Welles: "What Is It That You Want?": https://waynekirkwood.com/content/Orson ... u_Want.mp3

Americas Frontline Doctors Lawsuit Motion For Preliminary Injunction Of Covid-19 Vaccine Emergency Use Authorization: https://waynekirkwood.com/images/pdf/Am ... zation.pdf
Americas Frontline Doctors Lawsuit Whistle Blower Declaration: https://waynekirkwood.com/images/pdf/Am ... ration.pdf

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