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Old 22nd February 2006, 01:29 PM   #1
senicz is offline senicz  Poland
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Default My high power LM3886TF

Best sound, best power, super low price.
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Old 22nd February 2006, 02:00 PM   #2
PierreG is offline PierreG  Canada
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Very intersting.
Did you try it?
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Old 22nd February 2006, 03:50 PM   #3
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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!!
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Old 22nd February 2006, 04:06 PM   #4
Bazukaz is offline Bazukaz  Lithuania
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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.
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Old 23rd February 2006, 12:27 PM   #5
senicz is offline senicz  Poland
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I made this project exlusively for Hi-End speakers manufacturer "EDYTON".
For the high power output you should use 2X2SA1491/2SC2580.
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Old 24th February 2006, 06:31 AM   #6
Tim__x is offline Tim__x  Canada
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Are those darlingtons? If not your bias current is going to be very high, Iq(3886)*Hfe(Q2).
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Old 24th February 2006, 02:33 PM   #7
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Default high power gainclone

Have you ever tried this circuit
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Old 24th February 2006, 02:39 PM   #8
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Default Re: high power gainclone

Quote:
Originally posted by steven344
Have you ever tried this circuit
wow.. that's a strange circuit... do you have the explanation of how it works? I cant figure out..


thanks
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Old 24th February 2006, 02:54 PM   #9
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Default 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
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Old 24th February 2006, 02:56 PM   #10
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Default tracking

http://www.national.com/an/AN/AN-446.pdf
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