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Old 31st October 2010, 08:56 PM   #1
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Question L-MOSFET G.Randy Slone

Hello,

I am relatively new to the DIY high power audio scene. I specialize in a different branch of electronics and thought I would work on an audio DIY amp for experimentation. I picked up G. Randy Slone's High-Power Audio amplifier contruction manual.

Art work 11.8 with the L-MOSFET configuration is what I am interested in. To photo etch the board is going to be a problem since he over layed the parts outline and numbers on the top view of the PCB artwork. The photo etch is going to reproduce the component outline and short out traces.Does anyone have a clean version without all the overlay clutter?

Thanks,
Nick
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Old 31st October 2010, 10:25 PM   #2
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One of the amps in his book will never work and I think it may have been that one. It's been covered on here in depth. Have a search before you potentially burn all your parts.
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Old 1st November 2010, 10:14 PM   #3
mlloyd1 is offline mlloyd1  United States
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the one to avoid was the one with the complementary symmetry (npn and pnp diff amp) input stage with current mirror loads.

the other projects were "safe"



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Old 2nd November 2010, 01:14 AM   #4
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Question which schematic?

Does anyone have the High-power audio amplifier construction manual by Randy? Is the amplifier featured in figure 11.8 the infamous problem amp? Or is the 11.8 amp a good design?

There are a couple of L-mosfet amps in the book, not sure which one it is.

Thanks,
Nick
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Old 2nd November 2010, 03:16 AM   #5
mlloyd1 is offline mlloyd1  United States
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ok, i'll try again.
take a peek in this thread:
HEEEELLLPPP : M. Randy Slone Mirror Image Topology Construction - Troubles

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Old 2nd November 2010, 11:03 AM   #6
alex mm is offline alex mm  Europe
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Default PCB ....LMOSFET amplifier

Hi, PCB layout in 2009 may help you someway ......
Alex.
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Old 2nd November 2010, 12:40 PM   #7
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Thanks for the info !!! I am sure I will have even more questions trying to make sense of it all.

Nick
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Old 24th January 2011, 04:37 AM   #8
wojo411 is offline wojo411  United States
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Dude, art work shouldn't be a problem. Appendix Figure C.11 is the artwork for the amp in Figure 11.8. Figure C.9 & C.10 include the components on the artwork for reference when you're filling the board.

Now, the current mirror on the differential input stage, I understand, might be a problem. Never tried it. Good Luck.
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