[quote author="Samuel Groner"]
It's all about routing and grounding. Keep the input from the output, carefully check and re-route the ground pathes. Putting things into a grounded and shielded case usually helps a good deal as well. Increasing C4 a bit might help too. Do you have a proper PSU? If there's a lousy ground, such stuff is almost intractable.
[/quote]
Cheers, Samuel.
The PSU I'm using is the SSL9K PSU which I have tied the 0V (ie. the toroid's centre tap) to the star ground which is where the mains ground is too. The preamp's ground point goes to this star ground point once also. Does that sound ok?
It's not too easy looking at ground paths with the strip-board. It's not like using Orcad! I will see if I can improve it though...
I have a couple more 22pF caps, so I'll see if I add them in paralell to C4 helps at all.
Roddy
It's all about routing and grounding. Keep the input from the output, carefully check and re-route the ground pathes. Putting things into a grounded and shielded case usually helps a good deal as well. Increasing C4 a bit might help too. Do you have a proper PSU? If there's a lousy ground, such stuff is almost intractable.
[/quote]
Cheers, Samuel.
The PSU I'm using is the SSL9K PSU which I have tied the 0V (ie. the toroid's centre tap) to the star ground which is where the mains ground is too. The preamp's ground point goes to this star ground point once also. Does that sound ok?
It's not too easy looking at ground paths with the strip-board. It's not like using Orcad! I will see if I can improve it though...
I have a couple more 22pF caps, so I'll see if I add them in paralell to C4 helps at all.
Roddy