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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 24th August 2019, 09:52 PM   #11
Kay is offline Kay  Germany
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Join Date: Nov 2001
Location: Emden
Quote:
Originally Posted by jaxcore View Post
Have you considered using the CS3118 chip instead?
of course not,
the title above is PT2325

p.s.
CS3308/3318 are digitally controlled, not with DC (analog voltage)
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Kay

Last edited by Kay; 24th August 2019 at 09:55 PM.
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Old 25th August 2019, 02:21 AM   #12
PRR is offline PRR  United States
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Location: Maine USA
> I see 48 steps, but I don't 2dB step or anything else

I see "0 ~ -100dB/per channel", which suggests 2dB steps?
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Old 25th August 2019, 09:38 AM   #13
hansueli is offline hansueli  Switzerland
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Exactly. Thats why I want to use TP2325 because its DC controllable.


Other option is an old chip from Renesas but they have no datasheet.
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Old 25th August 2019, 10:14 AM   #14
stratus46 is offline stratus46  United States
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Join Date: Nov 2009
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Quote:
Originally Posted by hansueli View Post
so with adding Cirrus Logic I found it but it's SPI or IC.


I want DC funktion.


Or with SPI / IC I can use the output from my BDV-E2100?





DC control limits you to simple control of all channels. You can't alter gain of
1 channel vs another. 48 steps is a bit crude. I looked into gain control chips
before building my 6 channel preamp. I had a Chinese 6 channel remote
board based on the Mitsubishi M62446 and it was adequate but I wanted
better performance. I'm using 3 Cirrus CS3310 (same as PGA2311) stereo
chips and 3 NJW1119A stereo tone control chips all controlled by an Arduino
UNO board. Bass, Mid and treble have an 'all' control but individual channels
can be offset, same as the volume settings. The microcontroller route allows
far more flexibility. The TV controller also runs the audio system meaning
ANYBODY can run it exactly like a plain old TV. It does stereo when that is
all that's available and switches to 5.1. It's DIY. It's fun.

G
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Old 25th August 2019, 10:24 AM   #15
hansueli is offline hansueli  Switzerland
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stratus46 sound good but much more complex and expensiv. Have you some pictures of the board?


Thanks
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Old 25th August 2019, 01:20 PM   #16
Kay is offline Kay  Germany
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Join Date: Nov 2001
Location: Emden
Quote:
Originally Posted by stratus46 View Post
DC control limits you to simple control of all channels.
of course,
but here I expect no discussion for other solutions.

The PT2325 is cheap und a simple/good design.
Sometimes these are properties, I'm looking for.

(for individuell control, it's possible to use one PT2325 per channel,
or to form groups)
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Kay
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Old 25th August 2019, 05:10 PM   #17
stratus46 is offline stratus46  United States
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Location: Los Angeles
Quote:
Originally Posted by hansueli View Post
stratus46 sound good but much more complex and expensiv. Have you some pictures of the board?


Thanks
Here are some pix if I didn't mess up. The top and bottom shots have all the ceramic bypass caps and resistors mounted. The resistors are all thin film 0.5% except for the 4 resistors around the LM317 and LM337 regulators which are 1% thick film, all 0805 size. Signal caps for the NJW chips are 2% film.

Board is 4 layer and has a few silk screen errors but the traces are all correct.

I don't know how to post the schematic yet. It was my first try using KiCad.

G
Attached Images
File Type: jpg 6 channel preamp bottom P1040085.jpg (65.0 KB, 81 views)
File Type: jpg 6 channel preamp top P1040086.jpg (67.7 KB, 80 views)
File Type: jpg 6 channel preamp P1040483.jpg (79.6 KB, 81 views)
File Type: jpg 6 channel preamp P1040484.jpg (70.9 KB, 79 views)
File Type: jpg 6 channel preamp P1040511.jpg (71.8 KB, 78 views)
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Old 25th August 2019, 05:33 PM   #18
stratus46 is offline stratus46  United States
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Join Date: Nov 2009
Location: Los Angeles
Here is the schematic of the 6 channel preamp. I didn't use any coupling caps so it's DC coupled. The power amplifier input has coupling caps and the DAC output has them too so it isn't really DC coupled overall.

Note that the CS/PGA chips gain ranges from -95 to +31 dB in 1/2 dB steps so it is a 'preamp'.

G
Attached Files
File Type: pdf 6 channel schematic.pdf (186.6 KB, 27 views)

Last edited by stratus46; 25th August 2019 at 05:59 PM.
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Old 25th August 2019, 07:22 PM   #19
hansueli is offline hansueli  Switzerland
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I thing having super high-end DAC but only cheap TPA3116 board does not mach so good.


Or have you modded your 5.1 TPA3116 board?


I already own a TP2325. I only need to make the pcb...
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Old 25th August 2019, 09:51 PM   #20
stratus46 is offline stratus46  United States
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Join Date: Nov 2009
Location: Los Angeles
The power amp board has no mods at all. I'm running on a 19 Volt supply so it
does a little over 20 Watts into 8 ohms. Distortion levels are not that great on
paper but not at all bad just watching TV. 6 channels for $30.

As far as the PCB goes, I used JLCPCB in China. I emailed files Wednesday
morning from Los Angeles and had the boards in hand the following Tuesday.
5 pieces were $53 including $17 2nd day shipping. I was very happy with that
and still have 4 pieces.

Good luck.
G
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