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Old 17th June 2006, 06:51 PM   #21
taj is offline taj
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Quote:
Originally posted by kvholio
Todd, apart from the chg to ac-safety gnd connection with resistor, yes.

If possible, you might also extend the shaft for the stepped attenuator to make the input-signal wires as short as possible and keep them away from the noisy parts of the circuit: ac mains, transformers, rectifier diodes.

With kind regards,

Klaas

Thanks Klaas, I appreciate your insight.

Good point about the input leads. FYI, for clarity I 'hid' my heatsink from the drawing, and it consumes most of the 'white space' in that region. The attenuator is as close as it can get to the inputs without removing some heatsink fins. I may consider doing that after testing if the heat build-up isn't bad. I may also consider sawing my heatsink in half and reconfiguring the layout to accomodate a clear path so the attenuator can go all the way back, but I'm not sure if I'll be successful given the confines of dimension I'm working with.

The heavy black horizontal line is a steel shield/divider that will hopefully reduce some stray fields emanating from the power supply. I will also shield the input wires and possibly even the attenuator.

Let me know if that sounds misguided.

..Todd
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Old 17th June 2006, 07:41 PM   #22
kvholio is offline kvholio  Netherlands
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Todd, i dont think its necessary to cut your heatsink. It was merely a suggestion based on what i saw
I always use shielded interconnects for connecting signal-inputs btw. I hope you understand my recommendations till now do not guarantee a hum-free gainclone, it's just basic "sound"grounding to me (also, i'm no guru,whatever that may stand for).

Enzedone, about the picture of the star-grounds you posted in this thread: if this is a gainclone, it seems wrong to me.Where do all those groundwires originate from ?


with kind regards,

Klaas
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Old 17th June 2006, 08:49 PM   #23
taj is offline taj
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Quote:
Originally posted by kvholio
I hope you understand my recommendations till now do not guarantee a hum-free gainclone, it's just basic "sound"grounding to me (also, i'm no guru,whatever that may stand for).
What? No guarantee?

Seriously, I'm thrilled you have responded as much as you have. It's that spirit that makes this forum so valuable.

..Todd
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Old 18th June 2006, 08:14 PM   #24
kvholio is offline kvholio  Netherlands
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Sorry Todd ,no guarantee
Thank you for your kind words.
Please keep us updated about your progress (pictures please )
If you have any questions, don't hesitate to ask, you will find a lot of people here are very helpfull.

With kind regards,

Klaas
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