PCB for simple OP-preamp

kmj

Member
2004-02-10 12:00 pm
Falkenberg
to keep it short, will this do for a pcb-layout? I have never made a pcb before but i had some time over and parts that were of no use at the moment :)
the ground from the pot is at the same place as the inputground.
 

Attachments

  • pcb.jpg
    pcb.jpg
    47.3 KB · Views: 1,030

kmj

Member
2004-02-10 12:00 pm
Falkenberg
Roushon
So just make the rail between the 0,1uF MKP cap and the inputground thinner then.

tobias_svensk
Just move the cap to the other side of the electrolyte then.
(those yellow things next to the out R and out L text are two VERY big capacitors ):D

I'll have to test your advice, i put it together this afternoon and it works. However, i get a loud background buzz, like a bad radioreception.
 

kmj

Member
2004-02-10 12:00 pm
Falkenberg
Will do.
The buzzing is still there and i stumbled on a strange problem.

It still works with the NE5532 op, buzz and all, but not with opa2604.
If i shut the pre down and change op the fuses melt. strange since the opa2604 only need about 5-6mA and the fuse is rated at 125mA-slow and the supply is a regulated 12V.

one shouldn't have any prblem with something as simple as this....