STK465 Stereo Amp

[Roby_m]

Hi ,
I found this amp and a decided to make one.
http://www.electronics-lab.com/projects/audio/014/index.html
But I was wondering...I saw there are used some diffent values caps. On the PCB and the schematics on this site there are 4 10uF caps, and 4 100uF caps, but there aren't used this values ( saw in the photo of finished amp).
If you are kind to help me with some more info about these....

 

[audioguru2]

Hi Roby,
I think the parts list is for two separate amps but the pcb has them and their supply filters combined.
Did you find the Sanyo STK 465 hybrid amp modules anywhere? On a Google search I found a Telefunken stereo repairman saying that they are rare since they were made only in 1981.

 

[Roby_m]

Hi,

I found one very easy. I don't expect to be authentic, but many guys made it and they are glad by its sound.
Now, I do not know what to do, should I follow the PCB on the site with it's components or should I follow the original schematics?
PS. I made the PCB, and that's why I am in a dilemma.

Please help.
Thanks!

 

[audioguru2]

Hi Roby,
Build it as shown on the pcb layout and it might work OK. Notice that the outputs have many turns of wire wrapped around a 10 ohm resistor. For "the price of catering" or something!  ;D

 

[Roby_m]

Hi again... after some time
I didn't finish the amp then; now i decided to get it done.
When I was looking for GND ( 0V )..it hit me; should I connect the signal - and the output - with the 0V ? I'am afraid for oscilations... But in the PCB they are common...very odd.  Don't know what to do.
I'm a begginer, so I need your help, please.

Thanks 

 

[audioguru2]

Hi Roby,
The pcb has connection terminals near the inputs for the input grounds.
I don't see connection terminals for the power supply ground nor do I see terminals for the speaker grounds.
I think a very heavy wire should connect the power supply ground to the pcb then the speakers should have their ground wires connected to the power supply's ground.

I have never seen an amplifier pcb with the output zobel networks connected to the input grounds like this. It seems to guarantee oscillation.