Stage Line 500W amp repair project

[bikemech]

Few more bots arrived today

 

[WHONOES]

Looking good. You would be better off with strip board rather than the ones you have.

If you get really stuck with building the board, let me know and I will knock one up and mail it to you.

 

[bikemech]

Looking good. You would be better off with strip board rather than the ones you have.

If you get really stuck with building the board, let me know and I will knock one up and mail it to you.

Thank you for that, its not the actual building it, think i have difficulty understanding the schematic

 

[WHONOES]

I would pay you to have a read up on how Operational Amplifiers work as it would also give you some understanding of how you power amp's work as well. They are not to dissimilar.

 

[bertus]

Hello,

If you want to have a good read-up as @WHONOES said on opamps, have a look at the PDF I posted in post #545.
( https://www.mouser.com/pdfDocs/analogengineer’scircuitcookbookopamps.pdf )
An other PDF will be "opamps for everyone":
http://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf

Bertus

 

[bikemech]

Did a little test today, i connected an audio input to the phono jack at the rear of the amp, then connected a speaker to the 0v and In--R, at connection 9, i did this for both chanels and i do get clear audio and the volume/gain on the front panel seems to work correctly, so i think the pre amp is working ok

 

[bikemech]

Not going to go any further without guidance haha, i have got to this point 3 times now and always and up blowing transistors or something by being impatient, and it takes me a few days to test and replace parts to get back to here

 

[WHONOES]

Quite right. Busy doing your board at the moment. Will be able to have a look at what you have done soon>

 

[bertus]

Hello,

Pete has also a thread running at AAC about the amplifier:
Stage Line 500W amp repair, help please

Bertus

 

[bikemech]

Yes i do, the more help the better, however i am waiting on @WHONOES to get this ossiloscope up and running, there is nothing more i can do apart from take readings, different people work in different ways, i am just trying to gather as much knowledge as i can, hope this isnt an issue

 

[bikemech]

Are we still working on this ?

 

[WHONOES]

Yes. I have now finished and tested your board.

 

[WHONOES]

On post #586 can't find the connections you are referring to. When making these references can you please include the sheet number and grid reference of the points you are referring to!

 

[bikemech]

On post #586 can't find the connections you are referring to. When making these references can you please include the sheet number and grid reference of the points you are referring to!

This is where i connected the speaker to the left and right chanels pre amp, connections 5 and 7

 

[bikemech]

Well, hopefully i will receive some goddies from @WHONOES soon and i will be able to use my virtual scope and sig gen to see whats happening here, massive thanks to him and everyone else for all your support, i have no idea why the penny hasnt dropped yet, but hopefully it will soon, i hate looking stupid!, If i were to blow my own trumpet i would say find a better motorcycle mechanic in the north of england, you would find my garage always croped up, (cleveland county scooters )

 

[WHONOES]

Parcel on its way.

 

[bikemech]

I think the box is probably about the right size actually

 

[WHONOES]

Looks about right. Which way round have you fitted your IC's. I can't see from the picture. Can you get a clear close up picture.

 

[bertus]

Hello,

How are you going to fix the PCB in the box?
You might want to use some stand-offs:
https://www.sparkfun.com/categories/257

Bertus

 

[bikemech]

Hi, i have fitted the IC,s with the top to the cut out in the sockets, as in pin 1 top left, as for fitting everything into the box, i will first work out best positions and then look at insulating the board from the case , also @WHONOES , is there any issues if i remove the LED,s from the board and mount them remotely so i can have them visible through holes in the aluminium box ?