Grounds concept/direction/advice

[angchuck]

I have built a number of perfboard circuits, mostly chip amps. I usually built each module as a monoblock, ala chip amp kits; each with its own star ground. They work perfect individually, however in stereo or bridged mode, the sound one channel dominates the other channel.

I believe the problem is the location of common ground because i don't have issues with circuits i build as stereo.

So, in an aid to designing better perfboard grounds, (where ground planes are not possible) Should I:

1) Create 2 star grounds, one for signal and one for power

2) Pull out the common grounds from each channel into a common ground at psu ground

3) Connect both grounds at every possible opportune, ie signal, power and speaker ends.

Any advice/debate would be lovely

Chuck

 

[Puffin]

Are you referring to a Bridged or parallel circuit ? Which chips are you using ?

 

[gainphile]

This is my approach to grounding. Your miles may vary:


http://www.diyaudio.com/forums/showthread.php?s=&threadid=118735

 

[angchuck]

Are you referring to a Bridged or parallel circuit ? Which chips are you using ?

Bridged.

My Parallels oscillated too much, i was too lazy to match the chips thinking it was suffice that they were from the same batch.

Chips.. LT1210 (w/servo), LM1785(inverting), LM3785(non-inverting)

 

[Puffin]

I have bridged LM3886's and made two monoblocks ( i.e 2 chips per block) Each amp sounds indentical. You say you have got different gain on each amp ?

 

[angchuck]

I was saying i had bad grounds connections and the uneven balance was a sign.