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#61 |
diyAudio Member
Join Date: Dec 2010
Location: Paris, Ontario
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It seems to be the hallmark of a good PCB layout to not have jumpers, or at least very few of them. For the DIY crowd just how frowned upon are they? IMHO a few jumpers should be fine, especially if it avoids really loony trace routing. I ask as my current rip-up and re-route looks like it may need a few links on the board.
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---Jason Kuetemann--- Power is only granted to those willing to lower themselves enough to pick it up. |
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#62 | ||
diyAudio Member
Join Date: Jun 2011
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Quote:
With regard to its minimisation he says 'Minimise radiation from the supply rails by running the V+ and V- rails as close together as possible. Keep them away from the input stages of the amplifier, and the output connections; the best method is to bring the rails up to the output stage from one side, with the rest of the amplifier on the other side. Then run tracks from the output to power the rest of the amp; these carry no halfwave currents and should cause no problems' Quote:
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#63 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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use as many jumpers as needed.
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regards Andrew T. |
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#64 |
diyAudio Member
Join Date: Dec 2010
Location: Paris, Ontario
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So, here's another iteration.
Does this represent progress? I think it does, though any layout is a compromise. Rail fusing will be on the PSU board and remainder of the output network on a remote board at the speaker output terminals. The speaker ground will be returned directly to the PSU. Any constructive comments welcome with respect to layout. Thanks for the input thus far.
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---Jason Kuetemann--- Power is only granted to those willing to lower themselves enough to pick it up. |
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#65 | |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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Quote:
I love your local HF decoupling ! Any room to fit in some MF decoupling? Try 100uF on each rail somewhere. Add a pair of inverse parallel diodes across R3.
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regards Andrew T. Last edited by AndrewT; 28th October 2012 at 08:46 AM. |
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#66 |
diyAudio Member
Join Date: Mar 2006
Location: Baia Mare ,
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Hi Jason ,
Layout based on your PCB , sorry if I'm not welcome in your thread. ![]() Regards Alex. |
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#67 | |
diyAudio Member
Join Date: Dec 2010
Location: Paris, Ontario
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Quote:
Do you have any specific comments about my layout, good or bad?
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---Jason Kuetemann--- Power is only granted to those willing to lower themselves enough to pick it up. |
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#68 |
diyAudio Member
Join Date: Dec 2010
Location: Paris, Ontario
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Alex,
A couple observations regarding your layout, perhaps you could provide some feedback. You provided two spades for ground connections, but they are physically connected via traces. What's the reason or rationale? The outputs, drivers and VBE multiplier are intended to be attached to an L-bracket, the mounting holes in the upper corners probably don't need to be there, unless it is recommended to physically bolt the bracket to the PCB with dedicated hardware. Should there be dedicated fixing points or can the mounting screws for the devices be used exclusively? Some of my earlier iterations included the output inductor since the space seemed to be available for it. Community feedback suggested it is best located at the output terminals so I moved mine off-board. Many of your layouts include the inductor in the PCB. Any specific thoughts on wether it should be on / off and why? I like the 'all-in-one' idea personally, but others seem to prefer a more modular approach with physical separation of certain blocks. Thanks for providing some food for thought and an example from a more experienced perspective.
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---Jason Kuetemann--- Power is only granted to those willing to lower themselves enough to pick it up. |
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#69 | |
diyAudio Member
Join Date: Dec 2010
Location: Paris, Ontario
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Quote:
Any thoughts on 'rail catching' diodes, reverse biased from output rail to power rails? Came to mind when you mentioned putting diodes across the 10 ohm ground isolation resistor for the audio grounds.
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---Jason Kuetemann--- Power is only granted to those willing to lower themselves enough to pick it up. |
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#70 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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Output rail to supply rail diodes.
Supply rail to ground rail diodes. If the output or the supply rail are fused then repeat the diodes to both sides of the fuse/s
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regards Andrew T. |
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