Only little notice : lead ground line to the geometrical middle between caps - only small unbalance cause hum
[ST: You realy mean that distance, where lead ground attaches, should left and right be equidistance ?
Wow !
Sorry i forgot to upload a component placement or overall layout. I hope you could make any sense of it this way !
grtz
Simon
blu_line said:
[ST: You realy mean that distance, where lead ground attaches, should left and right be equidistance ?
Wow !
grtz
Simon
I think, the point is, that the leads have the same length to give
identical resistance. Am i right Pavel ?
Mike
To Simon and Michael : Trough elyts of PS comes from rectifier ripple peaks, which have opposite polarity and " run " also through ground connection. Because ground connection have not zero resistance, only on straigh geometrical middle are both deducted and " disturbance " have zero value. To this point you must connect input ( " signal " ) ground, but also load and all filtration grounds. If you do it by this way, you get quite " silent " amp ( with SNR over 120 dB ) .
can you show, where is speaker ground ?
Somewhere between the caps .
Since this is a prototype i ether connect it on the groundplane or at the power input connector !
grtz
Simon
Any success or new infos already ?
Sorry Mike. Not yet !
Last week was a very busy one.
Tryo to do it tomorrow.
oh! interesting! When i touch the speaker ,my speaker sound "boop, boop,..." .I increase compensate capacitor
So....... what do you try to say here ?
grtz
Simon
I did some measurements on the amp today, including the fixes from Mike. They did not completely solve the problem.
Grounding the DC servo on a different spot did come a lot closer to quietness. But not entirely.
And then...... i blew it.
Somehow i moved my probe and touched i do not know what.
Damn.
grtz
Simon
Grounding the DC servo on a different spot did come a lot closer to quietness. But not entirely.
And then...... i blew it.
Somehow i moved my probe and touched i do not know what.
Damn.
grtz
Simon
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