Yet Another Set of Noob GC Questions

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Hi everyone. I am attempting my first GC and am having trouble with the grounding. I have followed the LM3886 datasheet layout and as I am quite poor at the moment I have decided to build on Matrix board. I realise that this isn't the optimum but I just want to get the thing working before I tweak.

I have:
Dual secondary tx,
2 Rectifiers,
2 lm3886,
2 6800uF 100v
2 560uF 50v Pana FC

My problem is that I don't know where to connect the earths.

Where do I connect pin 7 (gnd)?

Also where do I connect the - lead of the speaker? I read that this should be connected to power ground but if I do I read -38v across the speaker :xeye:

Anyone, help please?

Lee.
 
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