The point is clear to me.
I think that if you want to sell some DIY gear, you should not use a circuit that is exactly the same being used in a readly available comercial product. And copying the PCB artwork, as smgaudio was doing, is even worst in this case.
In the other thread that I´ve started pointing to the smgaudio ebay auction, after he apologize, it has been sugested that he uses some old schematics of gear that´s not currently a commercial product. You have plenty of RCA, WESTERN ELECTRIC, COLLINS, LANGEVIN, ETC, ETC, ETC schems available. But you should use your own PCB design for this purpose.
It´s not hard at all. Many people in here has been making PCB artwork for their own DIY projects, so why one wouldn´t do for a commercial product? I see commercial DIY units more as Boutique audio gear than any other thing. Big companies in the market today started like this.
So, if you take an old limiter schematic, make your own circuit layout and sell it for any kind of money you want, teher´s nothing wrong with this. MANY, MANY audio hoses does exactly this tiday. DeMaria is just one example.
Now, if you don´t want to make your own G9 mic preamp, you should contact Jakob at Gyraf and buy one unit from him. Yes, he posted the project for anyone who wants to DIY for non-commercial purposes, but he still sell this units, I guess. For this he´s a great guy. Lot´s of respect, Jakob!!!
:thumb:
I think it´s clear where the line that shouldn´t be crossed is.
Now, if you want to make a clone of anything in the market for your own use, I don´t see any problem with this.