Completed Multichannel High End Preamp

[rehanabid]

Longtime ago i decided to build a pre using PGAs as pots with input output buffers, QS5.1 which converts a stereo input to 5.1, LCD/VFD , USB DAC and good poweramps.
Initially many guys here showed there interest in contributing but eventually it end up with a friend of mine in phillipines and myself.
Project was completed back in february, and my friend put the same as thesis work for his graduation and the efforts that was put in won him best project of the year.
We thought it was time that we shared the details of the project with the people of the board, as it may serve as a good help for those who want to take on an ambitious project like this one.
Here is the PIC of the AMP....

 

[rehanabid]

and here is the top view on the amp...

 

[Khron]

Is there any chance we'll ever get a peek at the schematic? I'm especially intrigued by the application of that QS5.1 chip....

 

[rehanabid]

we did post the schematics here a while ago, but the final designs include, temperature sensor, fan control, etc...
but i ll definitely post schematics....

 

[rehanabid]

heres a view of USB DAC, which is PCM2706

 

[tobias_svensk]

more more?!

 

[rehanabid]

and now the menu

and heres is the view of the VFD showing menu...

 

[rehanabid]

here is another option of the menu system..

 

[rehanabid]

power amps

heres the view of power amps which are as follows:
LM4780 for front left and right
LM4780 for rear left and right
LM4780 bridged for Sub woofer
LM3886 for center speaker
and beilive me they sound wonderful, good bass quality with good high freq and an excellent midrange.

 

[rehanabid]

A view of PGA2310, and OPA627 SMD board with decoupling caps

 

[rehanabid]

A view of inside of the completed amp, showing PGA board, PIC board, regulators, poweramp board, input relays (8), and output RCA Jacks.
This huge black circular object is the trafo and those mammoth looking blue colored objects are power caps.

 

[rehanabid]

another view of the inside of the completed amplifier with focus on rotary encoder, VFD and buttons for PCM2706 DAC, as would be noted that the amp is made of trasparent material, with blue LEDs which gives an excellent view, specially when the lights are out..
A few more PICs need to be posted, valuable comments from DIY community will be appreciated...

 

[E007]

Nice!

good job!!

 

[Khron]

I'd be really interested in the PIC (along with the program) and volume control section of your preamp, maybe even with a description of its functioning

Also, that QS 5.1 chip sounds intriguing

 

[edjosh23]

Very Nice.
I want one

Josh

 

[rehanabid]

for those who would need help in building their own project or wanna get may be a few extra PCBs can PM me.
will post more details later about the project.

 

[demogorgon]

Metal told me of this project a while back, great stuff!

I even started on something quite like this, but offcource i had to get curiouse about class d and smps before i got really started.

i managed to buy all the parts for it though

 

[rehanabid]

metal wanted to join the project, however due to his committments he couldnt spare time so it had to be completed by hau and myself.
anyways here is another view.
P.S thanks for the P.Ms guys I ll get back to you all soon.
Kinda busy these days.

 

[dan388]

program

Can u pls send me the code program that u used on ur pic ?
my email is: razvan_nist@yahoo.com...sry for my weak english..i am from romania!

 

[rehanabid]

friends: sorry right now i am not in a position to give away the firmware, however any one interested could contact <ferds.calma@gmail.com>, he may be having a few pre programmed mcu's.
here is another view of the amp.