Preparing for power scaling

[guitarmike2107]

There is no might be, either there is or there is not.

We use laws of physics established by famous scientists all the time without paying them dues, how many guitar amp builders have started building amps by looking at other peoples designs and learning from them... All of them!

Sorry I was obviously in rant mode last night, I should just say I was talking about the circuit concepts/designs. Product names etc are probably protected, so if you plan to use trademarked names you best be ready to pay for it.

[mooreamps]

We use laws of physics established by famous scientists all the time without paying them dues

Maybe we should....

-g

[guitarmike2107]

Maybe we should....

-g

Ethically, yes we should.... so who are the original inventors.. thats what patents are for...

[Steve Conner]

Patents expire, and so do famous scientists for that matter.

Nowadays the cutting edge of science is biotech and nanotech, and you can bet the earth-shaking discoveries in those fields will be patented and guarded by packs of slavering lawyers. It takes a lot of money and equipment to play in those fields now, and the capitalists funding you expect a return. The days are long gone when you could rewrite the laws of physics with just a shed, 5 tons of pitchblende and some lead underwear.

[defaced]

I would love to see the list of names required to properly give dues to even the simplest of tube circuits. In my book, you can't give credit to the guy who described the first tube without also giving credit to the guy who figured out how to commercially make it. I don't think a single person, or even a large team of people, could accurately compile the list.

[mooreamps]

Patents expire, and so do famous scientists for that matter.

Well, maybe not all of us...

But, what am saying is this... If folks want to use either Kevin's or Dana's circuit, that's fine. Then, folks should either pay them some respect by either agreeing to buy one of their kits, or at least send one of them 5 bucks as a "gratuity". After all, they are trying to run a respectable business and both are a great resource for the amp building community..

-g

[guitarmike2107]

Well, maybe not all of us...

But, what am saying is this... If folks want to use either Kevin's or Dana's circuit, that's fine. Then, folks should either pay them some respect by either agreeing to buy one of their kits, or at least send one of them 5 bucks as a "gratuity". After all, they are trying to run a respectable business and both are a great resource for the amp building community..

-g

I agree, to quote myself from above

and somebody buys that book and uses the technical information to further their product

[KevinOConnor]

Hi Guys

The cap from the pot wiper to ground eliminates pot noise and places the wiper at AC ground. There is no need to place a cap on the output of the mosfet but there should be a resistance to ground - typically a 330k-1W or so.

In Steve's SE amp, there should be a 10k-47k resistor between the Power Scale pot 0-end and ground. Without it, there is a dead-spot at the end of the pot sweep when the mosfet turns off. This is illustrated in TUT4. Also illustrated is the schematic he posted below the full amp schemo.

There seems little sense in re-inventing the wheel. Look at the wheel and see if you can improve it. If you can't, invent something else.

Have fun
Kevin O'Connor