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

6 Channel volume control PT2325
6 Channel volume control PT2325
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Old 28th August 2019, 10:28 PM   #21
Shaz is offline Shaz  United States
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Join Date: Jul 2003
Location: Colorado
For some time I've been interested in building an 8-channel volume controller for my 3-way plus subwoofer active system.

I use the miniDSP 4x10HD for my active crossover which makes use of digital volume control. I've had suspicions of digital volume control in properly maintaining signal resolution and negatively impacting optimum gain structure. Secondly, the miniDSP IR volume adjustment is extremely coarse with 3dB jumps in volume!

diyaudio has numerous DIY implementations using a variety of volume control ICs from various manufacturers.

I recently came across this 8-channel volume controller using the TI PGA4311 IC. I have not seen any mention of this on the forum. I'm considering giving it a try myself. It would cost far more than this and take a considerable amount of learning to build a controller myself.

PGA4311 Audio 8 Way Single ended / 4 Channel Balance Volumn Control Board HiFi-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
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Old 29th August 2019, 08:28 AM   #22
stratus46 is offline stratus46  United States
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The PGA4311 is simply 2 PGA2311s in the same package and is loaded exactly the same as a pair of PGA2311s. My Arduino code is currently
loading 3 PGA2311s. Altering it to run 1 more would be a little more than trivial as I also run the channels independently. It is also using NJW1119A
Bass/mid/treble tone control chips.

Do you work with Arduinos? The code is very similar to C. If you want to try
you can have a copy. If you buy an official Arduino they are around $25. Chinese knock offs (I use them) are between $5 and $10 out the door.

G
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Old 30th August 2019, 01:36 AM   #23
Shaz is offline Shaz  United States
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Quote:
Originally Posted by stratus46 View Post
The PGA4311 is simply 2 PGA2311s in the same package and is loaded exactly the same as a pair of PGA2311s. My Arduino code is currently
loading 3 PGA2311s. Altering it to run 1 more would be a little more than trivial as I also run the channels independently. It is also using NJW1119A
Bass/mid/treble tone control chips.

Do you work with Arduinos? The code is very similar to C. If you want to try
you can have a copy. If you buy an official Arduino they are around $25. Chinese knock offs (I use them) are between $5 and $10 out the door.

G
I have not worked with Arduinos. However, I am a developer and it is a platform I'm interested in playing with. What LCD display are you using? What IR/rotary encoder are you using? What interfaces on the Arduino are you employing for each device?

Sorry if this is getting off topic for the thread. Maybe we should start another thread and you can go into detail about your controller.
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Old 30th August 2019, 06:57 AM   #24
stratus46 is offline stratus46  United States
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Quote:
Originally Posted by Shaz View Post
I have not worked with Arduinos. However, I am a developer and it is a platform I'm interested in playing with. What LCD display are you using? What IR/rotary encoder are you using? What interfaces on the Arduino are you employing for each device?

Sorry if this is getting off topic for the thread. Maybe we should start another thread and you can go into detail about your controller.
I took your suggestion and started my first thread called 5.1 channel preamp.

G
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Old 22nd September 2019, 09:39 PM   #25
hansueli is offline hansueli  Switzerland
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Hello


I will oder tomorrow the PCB


What do you think about routing?


Board is 100x100mm and empty space is used for CLC-filter for the amp section.
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Old 25th September 2019, 04:13 PM   #26
Kay is offline Kay  Germany
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Location: Emden
Quote:
Originally Posted by hansueli View Post
I already own a TP2325. .
NO!
PT2325
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Kay
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Old 10th October 2019, 07:37 PM   #27
hansueli is offline hansueli  Switzerland
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I just received the PCB. Footprints are all good.




I just wait for the IC socket. I forgot to order it befor. I want to have the possibility to remove it easy.




I have 4 pcbs I can sell for the shipping fee. If some is interessted you can PM me.
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Old 15th October 2019, 01:01 PM   #28
hansueli is offline hansueli  Switzerland
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Finished board and components soldred.






I have just to solder the inputs and outputs wire.
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Old 17th October 2019, 01:56 PM   #29
Ken Newton is offline Ken Newton  United States
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Location: Eastern Pennsylvania
I strongly suspect that the reason more DIY hobbyists don't implement embedded MCU based control is due to a lack of specific knowledge about how to code and load the required S/W. The younger folks here are often familiar with how to do that, however, some of the older folks, maybe not so much.

There are finished S/W modules available, such as on the hifiduino site, however, unless you are utilizing the specific system hardware those modules were written for it must be modified to suit. Which requires knowledge of MCU programming. Even should some desired S/W module be utilized unmodified, the hobbyist still requires knowledge of what loading tools are required and how, exactly, to perform and verify the load.

I have to believe that there is probably a good Webinar, or YouTube series of clear, step-by-step, how-to-do-it videos somewhere on basic embedded MCU application S/W development and loading to specific MCU platforms, such as the Arduino. Basically, an 'everything you wanted to know about embedded MCU development and implementation but we're afraid to ask' type of thing. If anyone knows of such an Webinar or videos, please post links here for the benefit of those here who might be interested.

Last edited by Ken Newton; 17th October 2019 at 02:00 PM.
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Old 17th October 2019, 02:01 PM   #30
Kay is offline Kay  Germany
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Location: Emden
maybe it's a good idea to search in this forum
maybe this is something you are looking for:
Yet another Volume controlers and source selections
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Kay
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