OPA549 Amp Finished

[bostjancek]

I've just finished a new amp with OPA549. I must say that I'm very satisfied with the sound. It's very open and well defined in bass and in high region.

Here are some photo (not so good) :

 

[bostjancek]

The front wiev :

 

[bostjancek]

The rear view :

 

[bostjancek]

The side view :

 

[bostjancek]

This is inside view :

 

[Franz G]

Nice work, the case!

Is the front real wood or MDF?

If MDF: dont hesitate to apply shellack! Gives real great results, but must be learned (can be removed with alcohol...).

Franz

P.S.
What capacitance do the orange caps have?

 

[bostjancek]

And this is the PCB :

 

[demogorgon]

very nice indeed..
the more i see, the more inspired i become to make my own.. what size are those caps and the trafo?(i dont know the english word.. the big round thing made mostly of copper wire..)

 

[digi01]

the case is very neat,front board looks simplicity and nature😉
do you piece together the parts for the case?
I have a opa549 power amp too,and work at +/- 16V pre rail.it sound good.

what voltages have you use for the amp?

 

[getafix]

you have more components there than those in the application notes. whats the extra components for?

 

[soundNERD]

Would you mind posting the copper layout of the PCB?

 

[bostjancek]

Sorry for the delay ifor my answer :

FranzG : The front is from MDF and the capacitance is 2 x 15.000 uF but they are not connected (sound is much better without them)

Demogorgon : the trafo is a 2 x 19V 220 VA and is isolated to prevent hum and vibrations

Digi01 : I run it on +/- 26V per rail, I made the case - it took me some time

Getafix : more components ? There are 2 cond. 1000uF each for filtering the power suply, 2 cond. 100nF for blocking the power suply, 2 resistors for defining the amplificacion, 1 resistor for input, 1 input cond. and the extra thing is the zobel network directly on the PCB.

SoundNERD : I will post it.

Cheers

 

[getafix]

okay thanks... be waiting for that PCB layout

 

[soundNERD]

SoundNERD : I will post it.

thanks

 

[kozak]

I have just received my opa549.
I am planning to do an amplifier like yours shortly.
would it be possible for you to send me the copper layer of your pcbs?


Else, as the "dissipation" part of the opa549 isconnected internally to the V- ; I think you have isolated it from the dissipator; did you used isolation pads?


thanks

 

[mrskinny]

Just wanted to ask a couple of questions- I would assume the circuit is non-inverting? How much hum do you hear through your speakers, and what kind of speakers are they? Some advice- I would guess from the picture of the pcb that the red coloured capacitors are for the zobel. These will affect the sound a lot more than you might think- use good quality ones (like the ERO you have on the input).

 

[tino96]

Sorry for the delay ifor my answer :

>
>
>
........SoundNERD : I will post it.

Cheers

Wonderful work,
would you put online the entire project (schematic, PCB layout etc..)?
or you mail me?

tnx

 

[panterka]

Bye . It is generally OK, but this loudspeaker socket and entrance are terrible.

 

[Neteagle]

Wow, your box looks like very nice...
Can you post the schematics and the PCB please ?

Thanks,

NETeagle.

PS: I'll post my TDA7294 GC online too shortly 😉

 

[bostjancek]

Here is the PCB lay-out for OPA549 AMP.