PRE AMP FOR LM3886T

[1976]

CAN ANY BODY PLSHELP ME I HAVE ASSEMBLED LM3886T CIRCUIT & CONNECTED IT TO+_20 V SUPPLY & USED PRE AMP FROM PACE AMP 2040.IN WHICH TR BC549 IS USED BASS IS NOT SATISFACTORY AS AT MAX VOLUME BASS SOUND GET DISTIRBUED CAN AN BODY PROVIDE A PRE AMP SHEMATICS FOR LM3886 OUT PUT IC

[wintermute]

Hi 1976 I have moved your post to chipamps as it was off topic in the thread you posted in. Please note that ALL CAPS is considered shouting in Internet forums, please use lower case

You might want to read the excellent article by Michael Mardis on Gain structure, it may give you some insight into where your problem may be. What is Gain Structure?

[1976]

sorry i am new to net surfing

[KatieandDad]

You will need to be a bit more specific as to what you are trying to achieve.

Also how Hi-End you are aiming to achieve.

At the good-modest end of the spectrum a simple NE5532/4 will give you the gain that you need and not compromise the quality.

http://sound.westhost.com/project02.htm

This one from Rod Elliot is pretty good for most uses. I say this "tongue in cheek" as some guys are trying to get Rolls Royce performance out of their LM3886 amps.

[1976]

i want a 50w sound output per channel & better stereo effect with soft bass.

[pacificblue]

±20 V give you ~19 W into 8 Ohm or ~35 W into 4 Ohm. If you want 50 W into 4 Ohm, you need ±24 V for 4 Ohm or ±32 V for 8 Ohm.

Your decription sounds as if your amp was already overdirven and clipping. A different preamplifier won't change that. You either need higher supply voltage, bigger heatsinks, a different, more powerful amplifier or different speakers that give you more bass with the available power. Or you need to learn to live with what you have and not crank it up so loud.

Soft Bass? That is something you rather achieve with the speakers than with the amp.

[1976]

can any body help me with ua1458tc preamp circuit diagram

[GloBug]

On page 5 of the Fairchild Datasheet there is a drawing of a "high impedance, high gain inverting amplifier"

Maybe you could work from that.

[1976]

i am searching for circuit digram & pcb layout of lm3886t with output 200w per channel can any one help me

[picowallspeaker]

Hi ...200 W it's a lot !
You'll need to take well into account the thermical dissipation of each chip , if you go with the paralleled version ( search for BPA 200 or 300 ) or bridged version with that chip . I've build the enhanced Power Bridge version of the Tda 2030 A ,you can find it inside the datasheet under 'Applications' , but it gives you 100 W .