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mhennessy 1st August 2002 08:01 PM

Pictures of my almost-built preamp...
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Thought that you'd be interested in seeing some pictures of my PGA2310-based preamp that I've been building. Full details are on my website -

I'm at the testing stage - so I haven't had a chance to critically listen to it yet. But, I'll hopefully be able to report back at the weekend...

mhennessy 1st August 2002 08:03 PM

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Here's a picture of the surround-channels PCB...

mhennessy 1st August 2002 08:05 PM

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The power supply....

mhennessy 1st August 2002 08:06 PM

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Finally, a wide-shot of the whole lot... Thanks for looking!

mlloyd1 1st August 2002 08:11 PM

VERY nice looking work! Looking forward to the sonics report. Are you going to have the fancy front panel created also?

jleaman 1st August 2002 08:26 PM

nice i like that..

Peter Daniel 1st August 2002 08:35 PM

Man, I didn't see anything so nice in a long time. Reminds of my good, old days.;)

Brownlow 1st August 2002 09:07 PM

This is really good stuff, you have gone into great depth on your site it seems. I will be reading this shortly, lots of questions I've got are now answered. Wonderful.

promitheus 1st August 2002 09:55 PM

the PCBs have very clean lay out, Profi style.
Its from what I understand a surround prosessor.
Good luck in finishing it.
I would like to see more pictures .

mhennessy 4th August 2002 11:10 AM

Oh dear!

I promised you details of the sound quality at the weekend, but I haven't managed to try it in the hifi yet!

Unfortunately, I started playing with the software. This is the first time that I have had all 6 audio channels together with the relays, so I've been implementing all the main features I need to make it useful. So, in the last couple of days, I've added:
  • Balance control: +/-8dB from left or right channels in 0.5dB steps.
  • Surround level trims: +/-8dB in 0.5dB steps
  • Rear Balance: +/-8dB, as normal balance...
  • LFE L+R Mix option: As detailed on the webpage.

There's lot more little things like bugfixes and tweaks here and there. Trouble is, when I take a couple of hours to get 'into' the programming, I tend to go for days at a time while everything is fresh in my mind. I'm on a bit of a roll at the moment!

Still to come:
  • Input trim: -1.5 to +14.dB in 0.5 dB steps (strange limits, but that is what's available after considering the balance and surround level controls).
  • Save to EEPROM and power-fail routines: Still haven't tried writing to PIC EEPROM yet!
  • Code for 12V triggers...

Thanks for everyones comments - I'm glad you liked the pictures!

mlloyd1 - A friend at work has a simple milling machine, so I'm hoping he will cut the display window and switch holes for me. Should be nice and accurate...

However, I've been so impressed by recent pictures from Peter Daniel and others that I'm considering ditching the 1U rack case and try custom-making something!

promitheous - did you find all the pictures you wanted on my website? If there's anything else you'd like to see, let me know!

Thanks again to all,


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