I tried the same output stage but with a lm1875. I had lot of oscillation problems, but I made it work.
What I couldnt make work was the same but bridged.
the output transistors were 2n3055 / mj2955
good luck!! 😀
What I couldnt make work was the same but bridged.
the output transistors were 2n3055 / mj2955
good luck!! 😀
What is the reason to do this ? You won't be able to use > +-40V rails anyway.Using two LMs in parralel would give better reliability / easier to build.
Also i think that 2SA1491 have too low power dissipation for reliable operation.
Also i think that 2SA1491 have too low power dissipation for reliable operation.
I made this project exlusively for Hi-End speakers manufacturer "EDYTON".
For the high power output you should use 2X2SA1491/2SC2580.
For the high power output you should use 2X2SA1491/2SC2580.
Re: high power gainclone
wow.. that's a strange circuit... do you have the explanation of how it works? I cant figure out..
thanks
steven344 said:
wow.. that's a strange circuit... do you have the explanation of how it works? I cant figure out..
thanks
tracking power supplies
This is right from the national lm12 app notes,The zeners set up a regulated power supply to the lm12 as the audio increases the series pass transistors increase the voltage to to lm12,there is always no more then 39 volts between what the lm12 is putting out and the power supply rails feeding it ,its a tracking power supply,I have not tried it yet but I wonder if it would work with lm3875 or lm3886.As an example if the lm12 was putting out + 30 volt peak the + supply would increase to approx 69 volts and the negitive supply would decrease to about -9 keeping the lm12 within soa
This is right from the national lm12 app notes,The zeners set up a regulated power supply to the lm12 as the audio increases the series pass transistors increase the voltage to to lm12,there is always no more then 39 volts between what the lm12 is putting out and the power supply rails feeding it ,its a tracking power supply,I have not tried it yet but I wonder if it would work with lm3875 or lm3886.As an example if the lm12 was putting out + 30 volt peak the + supply would increase to approx 69 volts and the negitive supply would decrease to about -9 keeping the lm12 within soa
Tracking powersupply or current dumping
Im always looking for ways to increase the capacity of gainclones I prefer the Lm12 for sub amp the lm3875 or lm3886 is good for highs and mids
Im always looking for ways to increase the capacity of gainclones I prefer the Lm12 for sub amp the lm3875 or lm3886 is good for highs and mids
nice project
senicz,
nice project, I have been waiting years to see something like that posted here.
senicz,
nice project, I have been waiting years to see something like that posted here.
board layout
Just wanted to know if you had a good pcb layout for this,Im going to try to breadboard this first,Will this circuit work using 2 chips and output transistors in a bridge configuration
Just wanted to know if you had a good pcb layout for this,Im going to try to breadboard this first,Will this circuit work using 2 chips and output transistors in a bridge configuration
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