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DIY For Audio
Transformer position and orientation
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<blockquote data-quote="Shonver" data-source="post: 45324" data-attributes="member: 34"><p>I think we're digressing a bit to consider other possible reasons why Gerhard's amp is susceptible to hum.</p><p></p><p></p><p></p><p>It is, of course, not my own but something I copied from the ETI5000 MOSFET amp I built back in 1985 as a first year (2nd semester) Tech project. I think that this scheme is at least one step towards eliminating ground loops.</p><p></p><p></p><p></p><p>I actually designed my Blameless layout to have the loudspeaker 0V <em>on the board</em>. Firstly, I had 2 different net lists for signal ground and power ground. I connected these nets via the resistor (10R) right where the power ground connects onto the board. Just between the power ground and the decoupling resistor was the loudspeaker 0V. My idea was basically to sense the output as close to the take-off points as possible (i.e., sensing both 0V and power output). My partner in development was not quite adventurous enough to try this scheme when he was doing the distortion measurements, so we ended up using the conventional loudspeaker 0V connection point, the PSU star 0V. Any comments on my intentions?</p></blockquote><p></p>
[QUOTE="Shonver, post: 45324, member: 34"] I think we're digressing a bit to consider other possible reasons why Gerhard's amp is susceptible to hum. It is, of course, not my own but something I copied from the ETI5000 MOSFET amp I built back in 1985 as a first year (2nd semester) Tech project. I think that this scheme is at least one step towards eliminating ground loops. I actually designed my Blameless layout to have the loudspeaker 0V [i]on the board[/i]. Firstly, I had 2 different net lists for signal ground and power ground. I connected these nets via the resistor (10R) right where the power ground connects onto the board. Just between the power ground and the decoupling resistor was the loudspeaker 0V. My idea was basically to sense the output as close to the take-off points as possible (i.e., sensing both 0V and power output). My partner in development was not quite adventurous enough to try this scheme when he was doing the distortion measurements, so we ended up using the conventional loudspeaker 0V connection point, the PSU star 0V. Any comments on my intentions? [/QUOTE]
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DIY & Tutorials
DIY For Audio
Transformer position and orientation
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