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

Balanced Volume Controller / Line Stage
Balanced Volume Controller / Line Stage
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Old 12th August 2018, 08:08 PM   #21
spaceistheplace is offline spaceistheplace
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Balanced Volume Controller / Line Stage
Default Balanced Volume Controller / Line Stage

Excellent thread here!

Learning a lot on the trade offs between various topologies.

Iíll be following this closely.

PS even though the clicking is common in r2r ladders I believe it can be mitigated via software and/or other tricks.

Despite this drawback Iíve used this design in my system for some time and have come to view the clicking as gratifying.
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Last edited by spaceistheplace; 12th August 2018 at 08:13 PM.
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Old 14th August 2018, 09:37 AM   #22
bequerel is offline bequerel  Norway
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Quote:
Originally Posted by alexcp View Post
My goal was to build as much a drop-in line stage, complete with input and output circuitry, as a volume controller. <snip>
* Inductive Volume Controls
- Autoformer
- Transformer
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Old 14th August 2018, 01:48 PM   #23
NATDBERG is offline NATDBERG  United Kingdom
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Quote:
Originally Posted by alexcp View Post
[*]Stepped attenuators (e.g. goldpoint) - I heard these can be motorized, too, but I've never come across one.
Khozmo used to do one before their current model (which is now relay based with an optical encoder to control). And Bent Audio do an add-on kit for a few.

Last edited by NATDBERG; 14th August 2018 at 01:53 PM.
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Old 18th August 2018, 05:31 AM   #24
johnhenryharris is offline johnhenryharris  United States
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Seems like many people are coming up with different ideas for the volume control.
I did also, more conventional, digitally controlled volume, input, mute and IR remote.
See
Click the image to open in full size. Home > Forums > Source & Line > Analog Line Level Click the image to open in full size. Preamp Control -Volume,input,mute, remote Have a good one.
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Old 30th November 2018, 02:44 AM   #25
alexcp is offline alexcp  United States
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Balanced Volume Controller / Line Stage
Default Controlling the volume control chips

I got a request to share the Arduino sketch I used to control the MUSES72320 chip. In response, I attach the sketches to control each of the three digitally controlled boards I developed.

The sketches were created for test purposes, so they are functional but very much barebone. Let me know if you spot an error in any of the sketches.

As a little preview, I am finalizing a "digital knob" - see the picture. It is an Arduino in a very small form factor with an encoder attached and UART, SPI, I2C and some GPIO pins exposed. It can control any of the boards described above, plus one new board to be published soon. The encoder is a 12mm incremental encoder from ALPS (EC12), Bourns (PEC11R), or similar.
Attached Images
File Type: jpg spi knob.jpg (136.2 KB, 98 views)
Attached Files
File Type: zip WM8816.zip (2.3 KB, 9 views)
File Type: zip PGA2310.zip (1.8 KB, 12 views)
File Type: zip MUSES72320.zip (2.6 KB, 14 views)
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Old Yesterday, 10:36 PM   #26
alexcp is offline alexcp  United States
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Balanced Volume Controller / Line Stage
Default Now with the DS1882

As announced in my last post, here is one more volume controller. This one is based on the DS1882 digital pot, with the output buffered by matched JFETs, B1/Mezmerize style. The digital potentiometer, two JFET buffers and their analog power supply regulators are mounted on one 1100x1100mil (28x28mm) board.
Attached Images
File Type: jpg DS1882 - 5.jpg (46.8 KB, 28 views)
File Type: jpg DS1882 - 7.jpg (38.7 KB, 28 views)
File Type: jpg DS1882 - 9.jpg (60.0 KB, 16 views)
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Old Today, 12:49 AM   #27
alexcp is offline alexcp  United States
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Balanced Volume Controller / Line Stage
Default DS1882 - schematic

The schematic of the board from the above post is attached.
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File Type: png ds1882 sch.png (168.8 KB, 10 views)
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