L-MOSFET G.Randy Slone

macgman2000 · 31st October 2010, 08:56 PM

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

richie00boy · 31st October 2010, 10:25 PM

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.

mlloyd1 · 1st November 2010, 10:14 PM

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"

mlloyd1

macgman2000 · 2nd November 2010, 01:14 AM

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

mlloyd1 · 2nd November 2010, 03:16 AM

ok, i'll try again.
take a peek in this thread:
HEEEELLLPPP : M. Randy Slone Mirror Image Topology Construction - Troubles

mlloyd1

alex mm · 2nd November 2010, 11:03 AM

Hi, PCB layout in 2009 may help you someway ......

Alex.

macgman2000 · 2nd November 2010, 12:40 PM

Thanks for the info !!! I am sure I will have even more questions trying to make sense of it all.

Nick

wojo411 · 24th January 2011, 04:37 AM

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.

31st October 2010, 08:56 PM	#1
macgman2000 diyAudio Member Join Date: Oct 2010 Location: Los Angeles	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

31st October 2010, 10:25 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

2nd November 2010, 01:14 AM	#4
macgman2000 diyAudio Member Join Date: Oct 2010 Location: Los Angeles	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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1st November 2010, 10:14 PM	#3
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	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" mlloyd1

2nd November 2010, 03:16 AM	#5
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	ok, i'll try again. take a peek in this thread: HEEEELLLPPP : M. Randy Slone Mirror Image Topology Construction - Troubles mlloyd1

2nd November 2010, 12:40 PM	#7
macgman2000 diyAudio Member Join Date: Oct 2010 Location: Los Angeles	Thanks for the info !!! I am sure I will have even more questions trying to make sense of it all. Nick

24th January 2011, 04:37 AM	#8
wojo411 diyAudio Member Join Date: Jan 2011 Location: Michigan	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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