Yes. I agree. With more fets, Yfs/gm increases, making for higher Df as well as helping offset the increases Miller capacitance. Thing is, it doesn't seem like Nelson ever does anything for the heck of it and I wonder if there was a lesson learned in the beast of a thousand fets that has been passed on to his commercial offerings. although the article is rather new, I think the amp is much older. Just wandering if anybody had any ideas. Oh well. Sorry. I am on vacation and have too much time.
My take is same current more voltage . In effect raising the voltage swing that reaches the load on peaks overcoming the voltage loss normally in those resistors by conducting through the diode .This gives you a stable bias thru the resistor and peak flow through the diode like secondaries in the old carb.
I was there this Friday talking to Wayne and Nelson... In essence reliability is the biggest reason, but you also get nice things like more current capability and damping factor as well. So it's win-win.
Yes, this lack of voltage drop is what we see as good current capability.
The amplifier output voltage droops less as the output current increases.
This is still CURRENT capability as used by Flg
Seeing racks and racks of circuit boards and chassis pieces is kinda sensory overload for a DIYer... 🙂
As well as many boxes of unobtanium transistors... 😀
As well as many boxes of unobtanium transistors... 😀
Just spotted the dual choke carburettor analogy. Yes, it looks like a good one.
One choke starts to starve the air flow as engines revs rise. So the second choke opens to permit more area for more air flow. Air flow = current flow !
Hi All,
If I have dead quiet finish 1 channel F5T V2 (Experimental Build using non-official DIY Store Board) and a stable output DC offset, do I still need to bother for measuring nor looking for any Oscillation?
These are following exact component value per schematic.
Do I expect same result with the DIY Official board? Visualize that the only difference is the board layout. Currently, my non-official board is concentrated on a single big heatsink. When I use the DIY Store Board, going to mono...P and N Channel board will have each separate heat sink where the gain stage will be in the middle similar with the commercial Pass Amp.
Cheers.
If I have dead quiet finish 1 channel F5T V2 (Experimental Build using non-official DIY Store Board) and a stable output DC offset, do I still need to bother for measuring nor looking for any Oscillation?
These are following exact component value per schematic.
Do I expect same result with the DIY Official board? Visualize that the only difference is the board layout. Currently, my non-official board is concentrated on a single big heatsink. When I use the DIY Store Board, going to mono...P and N Channel board will have each separate heat sink where the gain stage will be in the middle similar with the commercial Pass Amp.
Cheers.
If it's working, it's not terminally oscillating...
Everything sounds like it's fine. 🙂 🙂 🙂
My bouts with oscillation had immediate effect and evidence in 1) smoked/burnt gate resistors, and 2) dead output mosfets.
Everything sounds like it's fine. 🙂 🙂 🙂
My bouts with oscillation had immediate effect and evidence in 1) smoked/burnt gate resistors, and 2) dead output mosfets.
Hi Jim,
Yes, I haven't experience 1 and 2 so far...burning the amp for 2 weeks already.
Still studying....and building confidence to go for the final build. Main stopper as of the moment is where to source out a huge heat sink suitable for much high bias.
Cheers.
Yes, I haven't experience 1 and 2 so far...burning the amp for 2 weeks already.
Still studying....and building confidence to go for the final build. Main stopper as of the moment is where to source out a huge heat sink suitable for much high bias.
Cheers.
We have this in the "Articles" area:
http://www.diyaudio.com/forums/diya...udio-component-grounding-interconnection.html
http://www.diyaudio.com/forums/diya...udio-component-grounding-interconnection.html
Man I guess if I just do a simple google search for star ground connections I get all I need to know, alot of info comes from this site. I think this is something that needs to be read up on to keep them nasty ground hums away, as this is one of biggest fears when I start to build.