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Old 8th June 2004, 10:15 AM   #1
veteran is offline veteran  Poland
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Default my own pga2310 pre-amp :)


Some time ago I decided to build a pre-amp on new TI pga2310 chip (this one is theoretical better than cs3310 offered by Crystal). There was a few models and ideas of it, but the (maby) final version You can see od the pictures below

Pga2310 is controlled by Atmel ATMega chip via SPI transoptor-isoleted bus. There are two ways to controll the volume, mute, zcen... - rc5 ir pilot or Bourns digital encoder.

Few board was made for me and the Lukar forum, and they will be tested soon. Software for uP still need some improves, but it is working enough stable now

More infos (in Polish only) and pictures you can finde on my web page
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Old 8th June 2004, 11:05 AM   #2
veteran is offline veteran  Poland
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Here is the picture
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Old 8th June 2004, 12:02 PM   #3
paulb is offline paulb  Canada
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Looks very nice.
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Old 8th June 2004, 12:29 PM   #4
pro is offline pro  Italy
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Very nice and interesting.
When do 'll be possible to have the site translated in a more affordable language?
No translator on the web for Polish language.
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Old 8th June 2004, 12:40 PM   #5
MWP is offline MWP  Australia
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Woo.. using a Crystalfontz PLED/OLED display (i work for them).
Looks nice.

Oh... but how does it sound??
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Old 9th June 2004, 07:39 AM   #6
Alien8 is offline Alien8  Belgium
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Default COOOOOL !

Hi veteran

Yours sure looks nice (AND compact)
Hopefully you find time to test them thoroughly soon (and post some results).

A few questions maybe :
I noticed you probably use 78/9xx style regulators for the analog supply. Can you measure what noise leeks through to the outputs ? Maybe a lower noise type could make a difference ?
And a more trivial thing : the specsheet says 10 mA quiescent current, but do you have an idea what would be the maximum current (probably at the +31.5 dB setting) into the 600 ohm load ?

You seem to have extra coolers on some of the regulators...

That would be a nice thing to know as I'm designing a similar one but with tl431 style regulators, which can't have that much current...

The 'woofer' is just the 2nd pga controller isn't it ?
If 'I' knew what I was doing, life would sure be easier...
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Old 11th June 2004, 08:58 PM   #7
veteran is offline veteran  Poland
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The sound is very neutral and op-amps inside the pga2310 works as a impedance buffer (with gain from -91.5 to 0dB).


I'm useing lm317/337 (+-15V) and I think that they are good enough for this aplication.
If you need more powerfull output use op-amp buffer. I don't recommend the 0 to +31.5dB scope. If you want to amplify the signal- use an external non inverting opamp (opa2604, opa1632...).

The second pga2310 is for a XLR but i'm useing it as a woofer driver.
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Old 12th June 2004, 07:51 PM   #8
kafka is offline kafka  Poland
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Hi, actually I'm also workimg on a similar design. But in my preamp there will be a buffer before and after PGA2310. As a power supply there will by LM317 and 337 with TL431 as a reference. See in datasheets.

BTW This is a very interesting link I'm basing on.

I'm sure I have seen some Mark's posts on this forum.
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Old 12th June 2004, 10:33 PM   #9
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Hehe, seems like everyone's making a pre with a pga2310. I'm planning to make one too after my JLH amps finished (it's been in the making for like 6 months now, I know, I'm slow).

I got a lot of idea's from that same url Kafka.
Here's some more idea's I will include that I haven't seen anywere else:
- Offset for left & right channel controlled with a digital potentiometer. Settings for all the inputs will be stored in the µcontroller.
- LCD backlight controlled by digital pot.
- Bit-banged I˛C output to interface with other DIY devices. Those devices have a µcontroller inside that decodes the signal and thus does things like turning on/off the device.
- Analog power supply will be made out of OPA548s (5A max output) and a REF3130 as a reference (0.2% accuracy, 15ppm/°C -> great isn't it ). Digital power supply will be some standard stuff (LM317 or something), it's just for the µcontroller, an LCD (well, VFD in my case) and some addition chips.
- The power for the analog stuff (+12v, +15v, -12v, ....) will be shutdown when the preamp is in standby modus (with the enable pin of the OPA548 or a MOSFET in case that opamp isn't used).
- A clock with alarm function, etc. (standard on stuff you buy, but I haven't seen it yet in a DIY preamp).
- More things that I can't think of right now .

Ok, that might not be ground breaking and all that original, but it might give you some idea's. Remember who you got them from .
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Old 17th June 2004, 11:47 PM   #10
Kay is offline Kay  Germany
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hello veteran,
nice pictures, but no Circuit?
best regards
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